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According to the literature, the risk of developing iliotibial band syndrome (ITBS) is related to the running technique of each runner. The purpose of this study was to investigate whether differences exist in the running technique of runners with ITBS and healthy runners. The sample was composed of 60 recreational runners (30 healthy runners and 30 with ITBS). A 3D kinematic analysis was performed to measure 3D joint angles of the lower limb. Reaction forces in the stance phase of running were also determined. Runners in the ITBS group exhibited significantly lower contact time, knee valgus, peak knee flexion and hip rotation. Of note, gender-based differences were observed. No differences were found between groups in hip adduction angle, tibial internal rotation and foot kinematics. The runners with current ITBS showed an altered kinematic profile. Male and female runners with ITBS showed different alterations in running kinematics. These results suggest that gender should be considered when investigating the biomechanical etiology of ITBS.
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VOLUME 13 | ISSUE 3 | 2018 |
1
Kinematics of recreational runners with iliotibial
band injury
BRUNO SUÁREZ LUGINICK
1
, JAVIER RUEDA OJEDA, SAR COLLAZO GARCÍA, SANTIAGO VEIGA
FERNÁNDEZ, ENRIQUE NAVARRO CABELLO
Faculty of Sports Sciences, Technical University of Madrid, Spain
ABSTRACT
According to the literature, the risk of developing iliotibial band syndrome (ITBS) is related to the running
technique of each runner. The purpose of this study was to investigate whether differences exist in the
running technique of runners with ITBS and healthy runners. The sample was composed of 60 recreational
runners (30 healthy runners and 30 with ITBS). A 3D kinematic analysis was performed to measure 3D joint
angles of the lower limb. Reaction forces in the stance phase of running were also determined. Runners in
the ITBS group exhibited significantly lower contact time, knee valgus, peak knee flexion and hip rotation. Of
note, gender-based differences were observed. No differences were found between groups in hip adduction
angle, tibial internal rotation and foot kinematics. The runners with current ITBS showed an altered kinematic
profile. Male and female runners with ITBS showed different alterations in running kinematics. These results
suggest that gender should be considered when investigating the biomechanical etiology of ITBS. Key
words: HIP, BIOMECHANICS, RUNNING, KNEE, PREVENTION.
1
Corresponding author. Health and human performance departament. Faculty of Sports Sciences. Technical University of
Madrid. Madrid. Spain.
E-mail: bruno.suarez.luginick@alumnos.upm.es
Submitted for publication April 2018
Accepted for publication May 2018
Published May 2018
JOURNAL OF HUMAN SPORT & EXERCISE ISSN 1988-5202
© Faculty of Education. University of Alicante
doi:10.14198/jhse.2018.133.19
Original Article
Cite this article as:
Suárez Luginick, B., Rueda Ojeda, J., Collazo García, C., Veiga Fernández, S., & Navarro Cabello, E.
(2018). Kinematics of recreational runners with iliotibial band injury. Journal of Human Sport and
Exercise, 13(3), in press. doi:https://doi.org/10.14198/jhse.2018.133.19
Suárez Luginick et al. / Kinematics of iliotibial band injury JOURNAL OF HUMAN SPORT & EXERCISE
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INTRODUCTION
Running has unquestionable benefits on health. However, it entails some risks, with the incidence of injury
ranging from 19.4% to 79.3% (Van Gent et al., 2007, Linde, 1986, Daoud, et al., 2012, Bovens et al. 1989).
The most commonly injured joint on runners is the knee (Fields, 2011; Bovens et al., 1989; Taunton et al,
2002;). According to Kezunovic (2013), 45% of all overuse knee injuries are caused by running.
Iliotibial band syndrome (ITBS) is the second most common cause of knee pain in runners (Van der Worp,
Van der Horst, De Wijer, Backx & Nijhuis-van der Sanden, 2012; Taunton et al., 2002). As reported by
Taunton et al (2012), women are twice as likely to develop ITBS as men. According to Phinyomark, Osis,
Hettinga, Leigh, & Ferber (2015), gender should be considered in the treatment of ITBS. Based on a study
in female runners with a history of ITBS, Ferber, Noehren, Hamill, & Davis, (2010) attributed a greater strain
on the iliotibial band (ITB) in female runners due to their greater peak hip adduction angle and knee internal
rotation angle.
The ITB is a thick band of fascia formed by connective tissue, a strong tendinous continuation of the tensor
fasciae latae and gluteus maximus muscles. The iliotibial band provides stabilization of the hip and knee,
limiting hip adduction and knee internal rotation in all planes of motion (Fredericson et al., 2000 and
Clemente, 2008). In relation to the knee, the ITB supports the fibular collateral ligament for the transverse
stability of the knee.
Lindenberg, Pinshaw & Noakes (1984) and Noble (1980) reported that, pain at the injury site occurs when
friction from the band rubbing over the bony prominence of the lateral femoral condyle causes an
inflammatory response in the ITB, the periosteum of the underlying bone, and/or the bursa that lies between
the bony prominence and the fascia. In contrast, Fairclough et al. (2006) reported that pain can also originate
from increased compression over the richly innervated fat tissue deep beneath the ITB but superficial to the
epicondyle. Orchard, Fricker, Abud, & Mason, (1996) reported that friction between the ITB and the condyle
occurs at 20º to 30º of knee flexion during the first half of the stance phase of running ("Sagittal plane theory").
Yet, no differences in knee flexion and extension patterns have been found between ITBS runners and
healthy controls (Miller, Lower, Meardon, & Gillette 2007; and Noehren, Davis, & Hamill 2007).
The causes of ITBS are not well understood, and differences in the kinematics of ITBS runners as compared
to unaffected runners have not been conclusively identified. Motions in other planes and joints may contribute
to ITBS (Phinyomark et al., 2015). Other potential factors such as excessive hip adduction (Noehren et al.,
2007), excessive knee internal rotation (Noehren et al., 2007; Faircloug et al., 2006; Grau, Maiwald, Krauss,
Axmann & Horstmann, 2008; Miller et al., 2007 & Phinyomark et al., 2015), hip external rotation (Phinyomark
et al. 2015; Tateuchi, Shiratori & Ichihashi, 2015; Baker, Souza, & Fredericson et al., 2000), rear-foot eversion
(Noehren et al., 2007; Ferber et al. 2010; Hamill, Van Emmerik, Heiderscheit, & Li, 1999) and maximum foot
inversion (Miller et al., 2007) may also contribute to ITBS. The only known kinetic abnormality is decreased
maximum normalized braking force (Messier et al., 1995).
The biomechanical etiology of ITBS remains unclear, a variety of biomechanical factors are associated with
a higher risk for ITBS. The first purpose of this study was to assess potential differences in the running
technique employed by runners with current ITBS and healthy runners. Based on the literature and the
prospective study by Noehren et al. 2007, we hypothesized that runners with ITBS would exhibit significantly
greater frontal, sagittal and transverse plane hip, knee, ankle joint angles during the stance phase of running.
The second purpose of this study was to examine how ITBS affects running kinematics in male and female
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runners experiencing ITBS. Based on the retrospective study by Foch & Milner, (2014), we hypothesized that
male and female runners with ITBS have different kinematic profiles.
MATERIALS AND METHODS
Participants
Sample size was determined a priori (a = 0.05, b = 0.20, desired effect size = 0.8) for one-way analysis of
variance (ANOVA) using the power analysis program G*Power 3 (Faul, Erdfelder, Lang, & Buchner. 2007).
The effect size chosen is based on differences reported in a prospective ITBS study (Noehren et al., 2007).
Power analysis revealed that a minimum sample of 28 participants was needed. Sixty recreational runners
were recruited, exceeding the minimum estimated sample size. Participants were classified into four groups:
a group of male runners with ITBS (M); a group of female runners with ITBS (F); a group of male controls CO
(M); and a group of female controls CO (F) (Table 1). All runners in the sample had been running a minimum
of 20km per week for more than two years. As the kinematic rollover pattern of forefoot runners (forefoot-
heel-forefoot) differs from that of rearfoot runners (heelforefoot) and the running study affects distinct time-
dependent and joint coordination parameters, only rearfoot runners were included in the ITBS group.
Inclusion criteria for current ITBS:
ITBS as diagnosed by a health professional (sports doctor, traumatologist, or licensed
physiotherapist).
Appearance of the typical pattern of symptoms while running (i.e. absence of pain at start, onset of
pain during the run, remission of pain after a period of rest or referred pain some hours after the run.)
Referred pain in the lateral femoral condyle associated with physical exercise at the moment of the
study.
Absence of concomitant injuries in the same anatomical region (lateral meniscus injury, chronic
tendonitis of the collateral lateral ligament, popliteus tendon syndrome, among others) reported in
medical record.
Male and female subjects 18 to 55 years of age.
A weekly run distance of at least 20 km.
Inclusion criteria for controls (CO):
Not having ever experienced any pain in the lateral femoral condyle while running.
Runners without a history of knee injury caused by running.
Male and female subjects 18 to 55 years of age.
A weekly run distance of at least 20 km.
Informed consent was obtained from all subjects. The study was approved by the local Ethics Committee
and in accordance with the Declaration of Helsinki as amended at the 59th General Assembly held in Seoul
in October 2008, the Spanish Act 14/2007 of July 3rd on Biomedical Research, and the Oviedo Convention
on Human Rights and Biomedicine (1997). At the time of data collection, none of the subjects in the ITBS
group were handicapped by pain, as the onset of pain in ITBS typically occurs after a ‘‘reproducible time or
distance run’’ (Fredericson et al., 2000), and not from the very beginning of a run or at rest.
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Measures
Subjects were asked to run in their usual running shoes on a 5 x 15m flat track marked with traffic cones. A
clear description of the route to be completed was provided. Runners run at a self-selected pace (Table 1)
until four trials were completed for each leg, in which runners moved over the force plates. Measurement
methods were not explained to runners to prevent alterations in their running technique. Standardized 10-
minute warm-up was performed in the same circuit.
The running technique of all subjects was analyzed using a system of six infrared Vicon® cameras (Oxford
Metrics Ltd, United Kingdom) set at a frequency of 120 Hz and synchronized with two Kisler® force plates
(Kistler Group, Switzerland) at 1000Hz.
Procedures
The body was defined as a set of seven rigid solid segments articulated together: pelvis and both thighs,
legs, and feet, respectively. For the determination of the six degrees of freedom of movement for each
segment, 23 spherical (14 mm in diameter) motion capture reflective markers were fixed on the body using
3M HealthCare tape. Four markers were placed on the hip (on the upper border of the right, left, anterior,
and posterior iliac crests), one on each trochanter of the femur, two on each knee (medial condyle and fibular
head), one on the outer thigh, one on the outer leg, two on each ankle (lateral and medial malleolus), and
three on each foot of the running shoe (on the head of the second toe, on the calcaneus at the same level
as the previous one, and on the head of the fifth metatarsal). Measurements were made by static and dynamic
testing where markers on the medial knee, ankle, and trochanter were removed for greater runner comfort.
Therefore, dynamic analysis included a total of 18 markers.
3-D coordinates of the markers were filtered and interpolated using fifth-order splines following the procedure
developed by Woltring, which was implemented using the Vicon® Workstation program. For the
determination of the smoothing factor, the mean square error (MSE) method was used, considering 4 mm2
as the standard deviation of data. Once the 3D coordinates of the markers were recorded, the following
dependent variables were obtained: frequency (number of cyclical leg movements per minute), and amplitude
(distance covered by each leg between its two extreme positions); along with hip, knee, and ankle angle with
respect to the three anatomical axes (transverse, anterior-posterior, and longitudinal), and ground reaction
forces by injury status (injured versus non-injured). All calculations were performed using VICON BodyBuilder
software (VICON; Oxford Metrics Ltd., United Kingdom).
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Figure 1. Outline of markers.
Analysis
Comparisons among the four groups were performed using SPSS 20.0 (SPSS Inc., Chicago, IL, USA). First,
two-factor ANOVA was calculated: injury (2) x leg-repeated measures (2) for men and women to assess
potential kinematic differences in the legs of runners. Two-factor ANCOVA of injury (2) x gender (2) was
conducted to determine whether there were significant differences between (male and female) injured
runners and controls. Speed was selected as covariate. The Bonferroti correction was used to prevent
experimental error from multiple comparisons. Results are grouped by related hypothesis. A p<0.05 was
considered statistically significant. Effect size was calculated using eta squared for each group of variables
(temporospatial, sagittal, frontal and transverse planes of motion and ground reaction forces). Cohen’s d was
used to determine effect sizes across variables. Based on Cohen’s conventional criteria (Cohen, 1988), an
effect size (d) greater than 0.8 was considered large, whereas an effect size between 0.5 and 0.8 was
considered medium (namely a trend).
RESULTS
Preliminary analysis revealed that no significant differences exist between the right and left leg of controls (p
> 0.05). The left leg was selected as the element of study. No differences were observed either between the
injured leg and the non-injured leg of runners with ITBS (p > 0.05), which is consistent with the literature
(Orchard, 1996).
The effects of the factor “injury” on the temporospacial variables were non-significant (F11=1.913, p=0.063).
In contrast, significant gender-based differences were found (F11=5.983, p<0.001, ES=0.59). The effect of
injury and gender interaction was significant (F11=2.372, p=0.021, ES=0.37).
Differences were observed among variables (Table 2). The runners with ITBS (male and female) exhibited
shorter contact time, with a moderate effect (d= 0.55). Contact time was shorter in the F (ITBS) group (d=0.90)
as compared to F (CO).
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The effects of the factor “injury” on sagittal plane variables were not significant (F23=1.427, p=0.172).
Significant gender-based differences were observed (F23=2.446, p<0.009, ES=0.63). The effect of injury and
gender interaction was not significant (F23=0.824, p=0.682).
Significant differences in movements in the sagittal plane are displayed in Table 3. The (male and female)
ITBS group exhibited greater anteversion of the pelvis (both, maximum and minimum angle), with very
significant differences (d=.83 and d=1.29). Knee flexion angle at initial contact and knee peak flexion during
stance were smaller in the ITBS group (d=0.66 and 1.28, respectively). These effects manifested differently
in male and female runners. Anteversion of the pelvis was greater in M (ITBS), with a small effect (d=0.31).
Peak knee flexion angle was smaller during stance (d=0.22) and swing (d=0.52), yet effects were small and
medium, respectively. Knee flexion at initial contact was decreased in F (ITBS), with a medium effect
(d=0.71). No significant differences were observed in ankle motion.
The effect of the factor "injury" on frontal plane variables revealed as significant (F14=6.361, p<0.001,
ES=0.68) and significant gender-based differences were observed (F14=6.536, p<0.001, ES=0.68). The
effect of injury-gender interaction was also significant (F14=2.250, p=0.022, ES=0.42). The differences
observed are displayed in Table 4. Peak knee varus angle was smaller in ITBS runners (male and female),
with a very large effect (d=1.09). It is remarkable that peak knee valgus angle was decreased both in men
and women, although its effect was very large in men (d=1.53) and moderate in women (d=0.7). Adduction
at toe-off was reduced in female ITBS runners, with a very large effect (d=1.11). There were no significant
differences in the kinematics of the foot.
In relation to the main effects of injury on sagittal transverse variables, the effect of the factor "injury" was
significant (F7=5.288, p<0.001, ES=0.43). Significant gender-based differences were observed (F7=3.951,
p=0.002, ES=0.36). The effect of injury-gender interaction was not significant (F7=1.793, p=0.11).
The differences observed are displayed in Table 5. Hip internal rotation in ITBS runners (male and female)
was decreased, with a moderate effect (d=0.65).
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The effects of the factor "injury" on reaction forces were not significant (F6=1.913, p=0.20). Yet, significant
gender-based differences were observed (F6=20.488, p<0.001, ES=0.71). The effect of injury-gender
interaction was not significant (F6=1.617, p=0.16).
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The differences found are displayed in Table 6. Female ITBS runners exhibited greater peak positive anterior-
posterior force, with a large effect (d=1.0), and a greater peak vertical ground-reaction force, with a medium
effect (d=0.71).
DISCUSSION
The purpose of this retrospective study was to investigate whether differences exist in the biomechanics of
running between male and female runners with current ITBS and controls without a history of knee injury
caused by running. After a thorough literature review, we decided to assess joint biomechanics in the three
planes of motion, namely: the sagittal, frontal and transverse plane. An analysis of temporospatial variables
and ground contact forces was also performed. It is worth mentioning that the studies conducted so far
primarily included female runners with a history of ITBS or runners who developed ITBS during follow-up. In
contrast, we analyzed how the presence of a current injury (ITBS) affects the biomechanics of running.
Significant differences were observed in the temporospatial variables amplitude and contact time. Contact
time was shorter in the ITBS group (male and women), as compared to the CO group. This is consistent with
the results obtained by Lieberman et al. (2010), who relates greater velocity of impact and decreased capacity
of absorption with greater loading on the knee. In addition, amplitude showed to be significantly greater in
the ITBS group. Although amplitude is considered crucial to improving running technique (Hay, J. G., & Reid,
J. G., 1988), there is no published data on amplitude in runners with ITBS. It is worth mentioning that gender-
based differences were observed in significant variables. Significant gender-based differences were found in
relation to contact time, which was lower in female ITBS runners.
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As to the sagittal plane, there were significant differences in anteversion of the pelvis, knee flexion at initial
contact and peak during stance. Differences were also observed in maximum knee flexion angle, which was
smaller in the ITBS group (male and female) as compared to the CO group. The results obtained provide
further evidence of the relevant role that knee flexion angle plays in the etiology of ITBS, as previously
reported (Noble, 1980; Orchard, Fricker, Abud, & Mason, 1996). Differences were found in maximum and
minimum anteversion of the pelvis between the ITBS group and controls. The values obtained might be
associated with excessive strain on the iliotibial band and the muscles attached to it (i.e. gluteus maximus
and tensor fasciae latae). Significant gender-based differences were noted. In men, differences were
recorded in pelvis anteversion angle and knee flexion angle during the stance phase and swing. In women,
the only significant difference shown was in knee flexion angle at initial contact. No differences were observed
between groups in hip and ankle flexion and extension angle. These results are in line with those obtained
by Phinyomark et al., (2015), who studied a sample of 48 runners with current ITBS.
In relation to motions in the frontal plane, no differences were demonstrated in hip adduction angle between
ITBS runners and controls. However, excessive hip adduction has been identified as a risk factor for ITBS
(Noehren et al., 2007; Ferber et al., 2010; Tateuchi et al., 2015; MacMahon, Chaudhari, & Andriacchi, 2000).
Nevertheless, it should be noted that the subjects included in these studies had a history of ITBS or developed
ITBS subsequently during follow-up but did not have current ITBS during the study. The similar hip adduction
angle observed in the runners of our study might be related to the greater trunk ipsilateral flexion exhibited
by runners with current ITBS and/or an increased rigidity of tissue caused by the injury, which limits hip
adduction (Foch, Reinbolt, Zhang, Fitzhugh y Milner, 2015).
Knee valgus angle was greater in runners with current ITBS and controls. This result supports the evidence
provided by Taunton et al (2002) that increased valgus might be associated with weakness in the adductor
muscles of the hip.
No differences were seen between groups in rear-foot eversion, which contradicts the results obtained by
McClay & Manal (1998); Nawoczenski, Saltzman, & Cook (1998). This inconsistency might be due to the
methodology employed, as tests in these studies were performed on a treadmill, whereas, in our study,
running was performed on the ground.
Regarding movements in the transverse plane, authors associate excessive tibial internal rotation with ITBS
(Noehren et al. 2007; Fairclough et al. 2006; Grau et al. 2008; Miller et al. 2007 and Phinyomark et al. 2015),
which was not confirmed by the results of our study or the Foch et al. study (2015). It is worth noting that the
samples of the studies that demonstrated a correlation between excessive tibial internal rotation and ITBS
were exclusively composed of female runners. Additionally, methodologies were not homogeneous, namely:
Noehren et al. (2007) included a study with a sample of female runners who developed ITBS during follow-
up. Fairclough et al. (2006) developed a cadaveric study. Finally, Miller et al. (2007) conducted a study on
exhaustive running on a treadmill, as did Phinyomark et al (2015). In our study, significant differences were
only found in hip internal rotation, which was smaller in the current-ITBS group, which is not in agreement
with the results obtained by Phinyomark et al. (2015). As it was mentioned above, this difference might be
due to methodological inconsistencies across studies.
Regarding ground reaction forces, there were no differences between ITBS groups (male and female) and
controls. In contrast, significant differences were observed in female runners regarding peak anterior-
posterior force and peak vertical force. These results might be supported by authors such as Lieberman et
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a. (2010), who associate a greater velocity of impact and decreased capacity of absorption with a greater
loading on the knee.
Notably, less than half the differences were statistically significant and none was significant both for the male
and female group. This is suggestive of a potential gender-based risk factor for ITBS. The results obtained
are in line with those reported by Foch et al. (2015). The reason for such consistency may be that the author
clearly distinguished between current ITBS and a history of ITBS, which is demonstrated by this study to be
a relevant factor. Our results contradict those obtained in previous studies in subjects with a history of leg
injury, a history of ITBS, or based on different measurement methods such as those conducted by Ferber et
al. (2010); Foch, E., & Milner, C. E. (2014); Miller et al. (2007); Noehren et al. (2007).
A limitation of this study is that, although participants were diagnosed by a health professional, the current
status of the injury was not assessed by a functional test the same day that measurements were performed.
Another potential limitation is that running tests took place indoors on a 15-m track at a self-selected pace.
Although speed did not have any effect as a covariate, running indoors instead of outdoors may affect the
running technique. Finally, the optimal study design to assess an overuse injury is by a prospective study,
although a cross-sectional study can yield data related to the specific status of an injury.
CONCLUSIONS
Recreational runners with current ITBS exhibited lower stance time, braking distance, knee flexion and varus
angle and hip rotation than controls. No significant differences were documented in tibial internal rotation, hip
adduction, and foot eversion, which are associated with female runners with a history of ITBS or who
ultimately develop ITBS. ITBS affects men and women differently. These factors should be considered by
coachers and physical trainers when modulating the running technique of runners with ITBS.
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This title is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.
... The relationship between GRF data and ITBS has been previously studied; one investigation found no differences for vertical, posterior, and mediolateral loading rates [22]. Other reports found inconclusive evidence for other aspects of GRF, including differences in peak GRF for runners with ITBS compared with healthy controls [18,19,21,23]. One limitation of previous studies was the analysis performed, which did not assess interactions of aspects of GRF that could classify injury status. ...
... Two studies did not find differences in antero-posterior peak forces [19,21]. In addition, inconclusive results were found for vertical and braking forces; one study showed higher vertical and peak braking forces [23], while the other showed only lower peak braking forces [18]. Unfortunately, no studies have presented data on GRF impulse values. ...
... Interactions between anteroposterior forces and vertical stiffness were associated with ITBS occurrence. Each of these factors were associated with RRIs and patellofemoral pain [18,22,23,36]. It can be suggested that interactions between anteroposterior forces and vertical stiffness may be more relevant for some injuries than others. ...
Article
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Iliotibial band syndrome (ITBS) is a common running related injury. While previous studies have evaluated the relationship between biomechanical variables and ITBS, most have found limited evidence, particularly with measures related to ground reaction force (GRF). The purpose of this study was to use a classification and regression tree (CART) analysis to determine whether the combination of GRF measures would be strongly associated in runners with ITBS. A cross-sectional study was performed at an outpatient center focused on running injuries. A convenience sample of 52 runners with ITBS, assessed between September 2012 and July 2022, were evaluated for eligibility, from which, 30 rearfoot strike runners with ITBS and no secondary running-related injuries were selected. Injured runners were matched to 30 healthy controls from a normative database. Each ran on an instrumented treadmill at a self-selected speed. GRF variables were calculated, including peak GRFs, loading rates, and impulses. CART analysis was performed to identify interactions between GRF data and runners with ITBS. An ROC curve was executed, to determine the accuracy of the model. Posterior GRF impulse (PGRFI), anterior GRF (AGRFI), peak anterior GRF (PAGRF), and vertical stiffness at initial loading (VSIL) all emerged as variables associated with ITBS in the CART analysis. The model was able to correctly identify 25 (83.3%) runners with ITBS and 25 (83.3%) controls. The area under the ROC curve (accuracy) was 0.87 (95% CI, 0.77–0.96; SE, 0.04; p < 0.001). In conclusion, interactions between GRF variables were associated with ITBS in runners. The best classification included interactions between PGRFI, AGRFI, AGRFP, and VSIL, using specific cut-off values. Loading rates were not independently associated with ITBS.
... Prospective evidence indicates that female runners who later developed ITBS exhibited greater peak hip adduction and knee internal rotation angles during running compared to female runners that remained healthy [7]. However, the literature remains equivocal associating greater peak hip adduction and knee internal rotation angles in female runners with current ITBS [14][15][16][17] and previous ITBS [6,15,18,19] compared to controls. Thus, kinematic risk factors for ITBS may differ between groups with differing injury status (currently versus previously injured). ...
... Furthermore, male runners with current ITBS exhibited different biomechanical risk factors compared to female runners with current ITBS. At the hip, male runners with current ITBS had greater peak hip internal rotation angles compared to healthy controls [17,20]. However, peak hip adduction angles were not different between males with current ITBS compared to controls [17,20]. ...
... At the hip, male runners with current ITBS had greater peak hip internal rotation angles compared to healthy controls [17,20]. However, peak hip adduction angles were not different between males with current ITBS compared to controls [17,20]. At the knee, both greater [20] and smaller [17] peak knee adduction angles during running have been exhibited by male runners with current ITBS compared to healthy controls. ...
Article
Background: Iliotibial band syndrome is a common overuse injury that is twice as likely to affect female runners compared to male runners. It is unclear if there is a consistent running pattern and strength profile exhibited by female and male runners with iliotibial band syndrome. Research question: The purpose of this systematic review and meta-analysis was to determine if any differences existed in lower-extremity kinematics and hip strength between runners who retrospectively, currently, or prospectively had iliotibial band syndrome. Methods: Papers included must have reported three-dimensional kinematic running data and/or hip strength data that were statistically analyzed between runners that never developed iliotibial band syndrome and runners with iliotibial band syndrome. Meta-analysis was performed for each kinematic or strength variable reported in at least three studies. Female and male runners were analyzed separately and grouped into three cohorts (retrospective, current, prospective). Results: Seventeen articles were included in this systematic review. Data from 10 cross-sectional studies were included for meta-analysis. Female runners with current iliotibial band syndrome exhibited smaller peak hip internal rotation angles and lower isometric hip abductor strength compared to controls. Significance: Although limited biomechanical evidence exists, risk factors for ITBS are different between female and male runners and may vary according to injury status. Specifically, transverse plane hip motion and hip abductor strength weakness may be biomechanical risk factors in female runners with current iliotibial band syndrome only.
... This study's findings also do not support previous research in recreational and high-school female runner populations where step rate, foot strike pattern, hip internal rotation, knee adduction, and knee flexion angle were found to be associated with multiple types of RRIs. [14][15][16][17] While knee flexion at foot-strike, hip internal rotation at footstrike, and foot-contact angle at foot strike trended toward statistical significance, this study's small sample size likely contributed to the lack of significant findings. Decreased knee flexion at foot strike has been associated with poorer force absorption at the knee leading to RRI such at ITBS as described in recent literature. ...
... Decreased knee flexion at foot strike has been associated with poorer force absorption at the knee leading to RRI such at ITBS as described in recent literature. [13][14][15][16][17] Increased hip internal rotation at foot-strike has also been described to be a moderate contributing factor to ITBS. 14-18 A runner with decreased foot contact angle at foot-strike (e.g., mid to forefoot strike pattern) may be more susceptible to RRIs such as Achilles tendinopathy and calf muscle strains due to increased eccentric activity of the calf musculature. ...
... In contrast, increased foot contact angle at foot-strike (e.g., heel strike pattern) transmits greater axial forces through the lower extremities and has been associated with injuries such as Patellofemoral Pain Syndrome. [14][15][16][17]19 CORRELATIONS BETWEEN HIP ABDUCTOR STRENGTH AND RUNNING KINEMATICS Few cross-sectional studies have observed the correlation between hip abductor muscle strength and running kinematics in female runners, and no reports are available regarding these relationships in female collegiate crosscountry runners. Similar to this study's findings, Baggaley et al. 20 found no statistically significant relationships between hip abductor muscle strength and hip adduction during stance. ...
Article
Full-text available
Background: Female collegiate cross-country (XC) runners have a high incidence of running-related injury (RRI). Limited reports are available that have examined potential intrinsic factors that may increase RRI risk in this population. Purpose: To examine the relationships between RRI, hip muscle strength, and lower extremity running kinematics in female collegiate XC runners. Study design: Prospective observational cohort. Methods: Participants included twenty female NCAA collegiate XC runners from Southern California universities who competed in the 2019-20 intercollegiate season. A pre-season questionnaire was used to gather demographic information. Hip muscle strength was measured with isokinetic dynamometry in a sidelying open-chain position and normalized by the runner's body weight (kg). Running kinematic variables were examined using Qualisys 3D Motion Capture and Visual 3D analysis. RRI occurrence was obtained via post-season questionnaires. Independent t-tests were used to determine mean differences between injured and non-injured runners for hip abductor muscle strength and selected running kinematics. Pearson correlation coefficients were calculated to examine relationships between hip muscle performance and kinematic variables. Results: End-of-the-season RRI information was gathered from 19 of the 20 participants. During the 2019-20 XC season, 57.9% (11 of 19) of the runners sustained an RRI. There were no significant differences between mean hip abductor normalized muscle strength (p=0.76) or mean normalized hip muscle strength asymmetry (p=0.18) of injured and non-injured runners during the XC season. Similarly, no significant differences were found between mean values of selected kinematic variables of runners who did and who did not report an RRI. Moderate relationships were found between hip abductor strength variables and right knee adduction at footstrike (r=0.50), maximum right knee adduction during stance (r=0.55), left supination at footstrike (r=0.48), right peak pronation during stance (r=-0.47), left supination at footstrike (r=0.51), and right peak pronation during stance (r=-0.54) (all p≤0.05). Conclusions: Hip abduction muscle strength, hip abduction strength asymmetry, and selected running kinematic variables were not associated with elevated risk of RRI in female collegiate XC runners. Level of evidence:
... We found 15 studies (three prospective and 12 retrospective) considering 93 potential BRFs for ITBS (SDC4) [31,32,[49][50][51][52][53][54][55][56][57][58][59][60][61]. Of these 93 potential BRFs, eight followed our relevance criterion. ...
... In addition to the six studies [51,53,54,56,57,59] showing conflicting evidence regarding peak hip adduction as a BRF for ITBS (Fig. 2), another four retrospective studies (D&B: 8-13; ROBS: 5-6) [32,52,54,61] could not establish a difference (neither higher nor lower values) in maximum hip adduction in runners with compared to runners without a history of ITBS (Fig. 2). ...
... At the knee, one moderate (D&B: 8; ROBS: 5) [32] and one high-quality (D&B: 11; ROBS: 5) [61] retrospective study identified reduced knee flexion angles at touchdown in runners with compared to runners without a history of ITBS (Fig. 2). However, these findings regarding knee flexion angles at touchdown could not be replicated by one moderate quality prospective (D&B: 10, ROBS: 5) study [59] (Fig. 2). ...
Article
Full-text available
Background Running overuse injuries (ROIs) occur within a complex, partly injury-specific interplay between training loads and extrinsic and intrinsic risk factors. Biomechanical risk factors (BRFs) are related to the individual running style. While BRFs have been reviewed regarding general ROI risk, no systematic review has addressed BRFs for specific ROIs using a standardized methodology. Objective To identify and evaluate the evidence for the most relevant BRFs for ROIs determined during running and to suggest future research directions. Design Systematic review considering prospective and retrospective studies. (PROSPERO_ID: 236,832). Data Sources PubMed. Connected Papers. The search was performed in February 2021. Eligibility Criteria English language. Studies on participants whose primary sport is running addressing the risk for the seven most common ROIs and at least one kinematic, kinetic (including pressure measurements), or electromyographic BRF. A BRF needed to be identified in at least one prospective or two independent retrospective studies. BRFs needed to be determined during running. Results Sixty-six articles fulfilled our eligibility criteria. Levels of evidence for specific ROIs ranged from conflicting to moderate evidence. Running populations and methods applied varied considerably between studies. While some BRFs appeared for several ROIs, most BRFs were specific for a particular ROI. Most BRFs derived from lower-extremity joint kinematics and kinetics were located in the frontal and transverse planes of motion. Further, plantar pressure, vertical ground reaction force loading rate and free moment-related parameters were identified as kinetic BRFs. Conclusion This study offers a comprehensive overview of BRFs for the most common ROIs, which might serve as a starting point to develop ROI-specific risk profiles of individual runners. We identified limited evidence for most ROI-specific risk factors, highlighting the need for performing further high-quality studies in the future. However, consensus on data collection standards (including the quantification of workload and stress tolerance variables and the reporting of injuries) is warranted.
... Excessive hip adduction 12,[15][16][17][18][19][20] and knee internal rotation 7,11,12,18,20 have been cited as risk factors for suffering ITBS. In exchange, no differences have been found in hip adduction or in knee internal rotation in runners with current symptoms [21][22][23][24][25] . This difference indicates that a higher strain rate in the iliotibial band in order to stabilise the hip and knee is characteristic of injured runners 26 . ...
... In other conditions such as anterior cruciate ligament (ACL) rupture, differences in neuromuscular activity between the two legs following operation have been studied 36 . In the case of ITBS, Suárez et al. 25 reported that no kinematic differences exist between both legs. Fredericson et al. 31 state that the injured leg produces lower abduction strength than the uninjured leg. ...
... The test area was marked out using cones and consisted of a surface measuring five metres wide and 15 metres long. The route to be run was carefully explained to each participant, with runners being free to choose their running speed 11,14,25,38 . The run was ended once four trials had been obtained of each leg. ...
Article
A study was performed to examine differences in hip and thigh muscle activation in male and female runners with and without iliotibial band syndrome (ITBS). The muscle activation of 21 runners (14 with ITBS and 7 healthy) was recorded during a run. No significant differences were observed in mean muscle activation between injured male and female runners. In contrast, in female runners with ITBS, there were differences in activation between the vastus lateralis and the tensor fascia lata (p<0.05), and between the vastus lateralis and the biceps femoris (p<0.05). With regard to male runners with ITBS, differences in activation were observed between the gluteus maximus and the 2 tensor fascia lata, and between the gluteus maximus and the biceps femoris (p<0.05). These findings contribute to a better understanding of iliotibial band syndrome and may be useful for designing of targeted treatments for the ITBS. KEY WORDS: electromyography, knee, iliotibial band syndrome. RESUMEN Esta investigación examinó las diferencias en la activación muscular en los músculos de la cadera y muslo en corredores y corredoras con y sin el síndrome de la banda iliotibial (SFBI). Se registró la actividad neuromuscular en 21 corredores durante la carrera (14 SFBI y 7 sanos). No se han encontrado diferencias significativas en la actividad muscular media entre los corredores y corredoras lesionados. Sin embargo, en el caso de las corredoras lesionadas, se han encontrado diferencias entre el vasto lateral y el tensor fascia lata, y entre el vasto lateral y el bíceps femoral (p<0,05 en ambos casos). En el caso de los corredores hombres lesionados, se han encontrado diferencias entre el glúteo mayor y el tensor fascia lata, y entre el glúteo mayor y el bíceps femoral (p<0,05 en ambos casos). Estos hallazgos proporcionan un mayor entendimiento de la lesión y ayudarían a un tratamiento más específico. PALABRAS CLAVE: electromiografía, rodilla, síndrome de la banda iliotibial.
... Quality assessment scores ranged from 56% to 94% (mean=71%). Of the 28 prospective, casecontrol and cross-sectional studies, 18 studies were scored as HQ [9,[21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37], ten as MQ [38][39][40][41][42][43][44][45][46][47]. 6 Inter-rater reliability between reviewers was calculated using percentage agreement for all studies ranged from 88% to 100%, with a mean of 95%. ...
... Seventeen articles investigated kinematic data of runners with ITBS during running compared with healthy runners [21,22,[36][37][38][39]41,45,47,[25][26][27][28][29][30]33,35]. Twelve studies evaluated kinematic data during the whole stance phase, 3 at 60% of stance phase, 1 by maximum excursion of angles at stance phase and 1 at full stride cycle. ...
Article
Full-text available
Introduction: Abnormal kinematics have been implicated as one of the major risk factors for lower limb tendinopathy (LLT). Objective: To systematically review evidence for kinematic risk factors for LLT in runners. Methods: Individual electronic searches in PubMed, EMBASE and Web of Science were conducted. Two reviewers screened studies to identify observational studies reporting kinematic risk factors in runners with LLT compared to healthy controls. The Down and Black appraisal scale was applied to assess quality. A meta-analysis was performed provided that at least two studies with similar methodology reported the same factor. Results: Twenty-eight studies were included: Achilles tendinopathy (AT) (9), iliotibial band syndrome (ITBS) (17), plantar fasciopathy (PF) (2), patellar tendinopathy (PT) (1), posterior tibial tendon dysfunction (PTTD) (1). Eighteen studies were rated high-quality and ten medium-quality. The meta-analyses revealed strong evidence of higher peak knee internal rotation, moderate evidence of lower peak rearfoot eversion, knee flexion at heel strike and greater peak hip adduction in runners with ITBS. Very limited evidence revealed higher peak ankle eversion in runners with PF and PTTD or higher peak hip adduction in PT. Significance: Peak rearfoot eversion was the only factor reported in all included LLTs; it is a significant factor in ITBS, PT and PTTD but not in AT and PF. More prospective studies are needed to accurately evaluate the role of kinematic risk factors as a cause of LLT. Taken together, addressing rearfoot kinematic and kinematic chain movements accompanied by peak eversion should be considered in the prevention and management of LLT.
... As a result, this may exert an additional strain on the hip abductor muscles eccentrically, causing compression of the ITB against the greater trochanter or lateral femoral condyle, potentially leading to a greater prevalence of symptoms among female runners [56]. Furthermore, another study showed different alterations in running kinematics and attributed a greater strain on the iliotibial band (ITB) in female runners to their greater peak hip adduction angle and knee internal rotation angle [57]. ...
Article
Full-text available
Background: Despite the numerous health benefits of distance running, it is also associated with the development of 'gradual onset running-related injuries' (GORRIs) one of which is Iliotibial Band Syndrome (ITBS). Novel risk factors associated with a history of ITBS (hITBS) have not been described in a large cohort of distance runners. Objective: To identify risk factors associated with hITBS in distance runners. Design: Descriptive cross-sectional study. Setting: 21.1 km and 56 km Two Oceans Marathon races (2012-2015). Participants: 106 743 race entrants completed the online pre-race medical screening questionnaire. A total of 1 314 runners confirmed an accurate hITBS diagnosis. Methods: Selected risk factors associated with hITBS explored included: demographics (race distance, sex, age groups), training/running variables, history of existing chronic diseases (including a composite chronic disease score) and history of any allergy. Prevalence (%) and prevalence ratios (PR; 95% CI) are reported (uni- & multiple regression analyzes). Results: 1.63% entrants reported hITBS in a 12-month period. There was a higher (p < 0.0001) prevalence of hITBS in the longer race distance entrants (56 km), females, younger entrants, fewer years of recreational running (PR = 1.07; p = 0.0009) and faster average running speed (PR = 1.02; p = 0.0066). When adjusted for race distance, sex, age groups, a higher chronic disease composite score (PR = 2.38 times increased risk for every two additional chronic diseases; p < 0.0001) and a history of allergies (PR = 1.9; p < 0.0001) were independent risk factors associated with hITBS. Conclusion: Apart from female sex, younger age, fewer years of running and slower running speed, two novel independent risk factors associated with hITBS in distance runners are an increased number of chronic diseases and a history of allergies. Identifying athletes at higher risk for ITBS can guide healthcare professionals in their prevention and rehabilitation efforts.
... Consistent with these observations, several studies found hip abductor weakness to be associated with ITBS, although the notion is not undisputed (Mucha et al., 2017). Improper lower limb alignments at the ankle or foot, such as increased rearfoot eversion (Balachandar et al., 2019), might coincide with malalignments and increased stresses at the knee, although further research is required to confirm the role of ankle or foot malpositions in the etiology of ITBS (Ferber et al., 2010;Noehren et al., 2007;Su arez Luginick et al., 2018). While the shape and alignment of lower limb bones influence the orientation of the resultant force R that acts on the lateral aspect of the knee, it is the activity of muscles inserting into the ITB (GMax, TFL, GMed, vastus lateralis, biceps femoris) that determines its magnitude. ...
Article
Objective Iliotibial band syndrome (ITBS) is presumably caused by excessive tension in the iliotibial band (ITB) leading to compression and inflammation of tissues lying beneath it. Usually managed conservatively, there is a lack of scientific evidence supporting the treatment recommendations, and high symptom recurrence rates cast doubt on their causal effectiveness. This review discusses the influence of common physiotherapeutic measures on risk factors contributing to tissue compression beneath the ITB. Methods The potential pathogenic factors are presented on the basis of a simple biomechanical model showing the forces acting on the lateral aspect of the knee. Existent literature on the most commonly prescribed physiotherapeutic interventions is critically discussed against the background of this model. Practical recommendations for the optimization of physiotherapy are derived. Results According to biomechanical considerations, ITBS may be promoted by anatomical predisposition, joint malalignments, aberrant activation of inserting muscles as well as excessive ITB stiffness. Hip abductor strengthening may correct excessive hip adduction but also increase ITB strain. Intermittent stretching interventions are unlikely to change the ITB's length or mechanical properties. Running retraining is a promising yet understudied intervention. Conclusions High-quality research directly testing different physiotherapeutic treatment approaches in randomized controlled trials is needed.
Article
Esta investigación examinó las diferencias en la activación muscular en los músculos de la cadera y muslo en corredores y corredoras con y sin el síndrome de la banda iliotibial (SFBI). Se registró la actividad neuromuscular en 21 corredores durante la carrera (14 SFBI y 7 sanos). No se han encontrado diferencias significativas en la actividad muscular media entre los corredores y corredoras lesionados. Sin embargo, en el caso de las corredoras lesionadas, se han encontrado diferencias entre el vasto lateral y el tensor fascia lata, y entre el vasto lateral y el bíceps femoral (p<0,05 en ambos casos). En el caso de los corredores hombres lesionados, se han encontrado diferencias entre el glúteo mayor y el tensor fascia lata, y entre el glúteo mayor y el bíceps femoral (p<0,05 en ambos casos). Estos hallazgos proporcionan un mayor entendimiento de la lesión y ayudarían a un tratamiento más específico.
Article
Full-text available
Background The popularity of running is still growing and, as participation increases, the incidence of running-related injuries will also rise. Iliotibial band syndrome (ITBS) is the most common injury of the lateral side of the knee in runners, with an incidence estimated to be between 5% and 14%. In order to facilitate the evidence-based management of ITBS in runners, more needs to be learned about the aetiology, diagnosis and treatment of this injury. Objective This article provides a systematic review of the literature on the aetiology, diagnosis and treatment of ITBS in runners. Search strategy The Cochrane Library, MEDLINE, EMBASE, CINAHL, Web of Science, and reference lists were searched for relevant articles. Selection criteria Systematic reviews, clinical trials or observational studies involving adult runners (>18 years) that focused on the aetiology, diagnosis and/or treatment of ITBS were included and articles not written in English, French, German or Dutch were excluded. Data collection and analysis Two reviewers independently screened search results, assessed methodological quality and extracted data. The sum of all positive ratings divided by the maximum score was the percentage quality score (QS). Only studies with a QS higher than 60% were included in the analysis. The following data were extracted: study design; number and characteristics of participants; diagnostic criteria for ITBS; exposure/treatment characteristics; analyses/outcome variables of the study; and setting and theoretical perspective on ITBS. Main results The studies of the aetiology of ITBS in runners provide limited or conflicting evidence and it is not clear whether hip abductor weakness has a major role in ITBS. The kinetics and kinematics of the hip, knee and/or ankle/foot appear to be considerably different in runners with ITBS to those without. The biomechanical studies involved small samples, and data seem to have been influenced by sex, height and weight of participants. Although most studies monitored the management of ITBS using clinical tests, these tests have not been validated for this patient group. While the articles were inconsistent regarding the treatment of ITBS, hip/knee coordination and running style appear to be key factors in the treatment of ITBS. Runners might also benefit from mobilization, exercises to strengthen the hip, and advice about running shoes and running surface. Conclusion The methodological quality of research into the management of ITBS in runners is poor and the results are highly conflicting. Therefore, the study designs should be improved to prevent selection bias and to increase the generalizability of findings.
Article
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Proximal factors such as excessive frontal plane pelvis and trunk motion have been postulated to be biomechanical risk factors associated with iliotibial band syndrome. Additionally, lateral core endurance deficiencies may be related to increased pelvis and trunk motion during running. The purpose of this cross-sectional investigation was to determine if differences in biomechanics during running, as well as lateral core endurance exist between female runners with previous iliotibial band syndrome and controls. Gait and lateral core endurance were assessed in 34 female runners (17 with previous iliotibial band syndrome). Multivariate analysis of variance was performed to assess between group difference in pelvis, trunk, hip, and knee variables of interest. Runners with previous iliotibial band syndrome exhibited similar peak: trunk lateral flexion, contralateral pelvic drop, hip adduction, and external knee adduction moment compared to controls. Additionally, trunk - pelvis \ coordination was similar between groups. Contrary to our hypotheses, both groups exhibited trunk ipsilateral flexion. Lateral core endurance was not different between groups. These findings provide the first frontal plane pelvis and trunk kinematic data set in female runners with previous iliotibial band syndrome. Frontal plane pelvis and trunk motion may not be associated with iliotibial band syndrome.
Article
According to many statistics over 55% of all sports-related injuries are incurred in the knee joint (active sportsmen and recreationists). The statistics definitely differ, depending on type of sport and specific movements habitually performed in a particular sport. Therefore, in addition to acute knee injuries overuse syndromes are common in the knee area also due to specificities of patellofemoral joint just because specific diseases like „jumper's knee“ and „runner's knee“ are related to certain sport activities. Generally speaking, these syndromes occur due to poor orientation of the knee extensor mechanism, i.e. friction of iliotibial band and patellofemoral chondromalacia. It is believed that about 45% of all overuse syndromes in the knee area occur as a result of running.
Article
In brief: Thirty-six long-distance runners suffering from iliotibial band friction syndrome were treated and followed for at least one year. Treatment consisted of icing, stretching, changing to soft running shoes that were modified to correct leg-length discrepancies and increase pronation at the ankle, running on soft surfaces, avoiding downhill and sidehill running, and temporarily decreasing mileage. Most subjects (58%) were symptom-free within three weeks, and 83% were symptom-free within six months. The authors identified several etiological factors (inadequate or excessive pronation and hard running surfaces and shoes) and concluded that leg-length discrepancies may not contribute to iliotibial band friction syndrome. They suggest conservative treatment, reserving hydrocortisone injections, orthoses, and surgery for resistant cases.
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This large treatise (1209 pages) can be considered the most complete textbook of clinical anatomy available today. The text in the book is aided by outstanding figures from the 11 editions of John C. Boileau Grant's classical anatomical atlases. These are very capably re-edited and supplemented by hundreds of creative and illuminating anatomical and clinically relevant art produced by Dr Anne M. R. Agur.
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Iliotibial band syndrome (ITBS) is a common overuse knee injury that is twice as likely to afflict women compared to men. Lower extremity and trunk biomechanics during running, as well as hip abductor strength and iliotibial band flexibility, are factors believed to be associated with ITBS. The purpose of this cross-sectional study was to determine if differences in lower extremity and trunk biomechanics during running exist among runners with current ITBS, previous ITBS, and controls. Additionally, we sought to determine if isometric hip abductor strength and iliotibial band flexibility were different among groups. Twenty-seven female runners participated in the study. Participants were divided into three equal groups: current ITBS, previous ITBS, and controls. Overground running trials, isometric hip abductor strength, and iliotibial band flexibility were recorded for all participants. Discrete joint and segment biomechanics, as well as hip strength and flexibility measures were analyzed using a one-way analysis of variance. Runners with current ITBS exhibited 1.8 (1.5)° greater trunk ipsilateral flexion and 7 (6)° less iliotibial band flexibility compared to runners with previous ITBS and controls. Runners with previous ITBS exhibited 2.2 (2.9) ° less hip adduction compared to runners with current ITBS and controls. Hip abductor strength 3.3 (2.6) %BM×h was less in runners with previous ITBS but not current ITBS compared to controls. Runners with current ITBS may lean their trunk more towards the stance limb which may be associated with decreased iliotibial band flexibility. Copyright © 2015 Elsevier B.V. All rights reserved.
Article
Although several studies have described kinematic deviations such as excessive hip adduction in patients with iliotibial band (ITB) syndrome, the factors contributing to increased ITB hardness remains undetermined, owing to lack of direct in vivo measurement. The purpose of this study was to clarify the factors contributing to an increase in ITB hardness by comparing the ITB hardness between the conditions in which the angle, moment, and muscle activity of the hip and knee joint are changed. Sixteen healthy individuals performed the one-leg standing under five conditions in which the pelvic and trunk inclination were changed in the frontal plane. The shear elastic modulus in the ITB was measured as an indicator of the ITB hardness using shear wave elastography. The three-dimensional joint angle and external joint moment in the hip and knee joints, and muscle activities of the gluteus maximus, gluteus medius, tensor fasciae latae, and vastus lateralis, which anatomically connect to the ITB, were also measured. ITB hardness was significantly increased in the posture with pelvic and trunk inclination toward the contralateral side of the standing leg compared with that in all other conditions (increase of approximately 32% compared with that during normal one-leg standing). This posture increased both the hip adduction angle and external adduction moment at the hip and knee joint, although muscle activities were not increased. Our findings suggest that coexistence of an increased adduction moment at the hip and knee joints with an excessive hip adduction angle lead to an increase in ITB hardness. Copyright © 2014 Elsevier B.V. All rights reserved.
Article
Atypical running gait biomechanics are considered a primary factor in the aetiology of iliotibial band syndrome (ITBS). However, a general consensus on the underpinning kinematic differences between runners with and without ITBS is yet to be reached. This lack of consensus may be due in part to three issues: gender differences in gait mechanics, the pre-selection of discrete biomechanical variables, and/or relatively small sample sizes. Therefore, this study was designed to address two purposes: (1) examining differences in gait kinematics for male and female runners experiencing ITBS at the time of testing and (2) assessing differences in gait kinematics between healthy gender- and age-matched runners as compared with their ITBS counterparts using waveform analysis. Ninety-six runners participated in this study: 48 ITBS and 48 healthy runners. The results show that female ITBS runners exhibited significantly greater hip external rotation compared to male ITBS and female healthy runners. On the contrary, male ITBS runners exhibited significantly greater ankle internal rotation compared to healthy males. These results suggest that care should be taken to account for gender when investigating the biomechanical aetiology of ITBS.
Article
G*Power (Erdfelder, Faul, & Buchner, 1996) was designed as a general stand-alone power analysis program for statistical tests commonly used in social and behavioral research. G*Power 3 is a major extension of, and improvement over, the previous versions. It runs on widely used computer platforms (i.e., Windows XP, Windows Vista, and Mac OS X 10.4) and covers many different statistical tests of the t, F, and chi2 test families. In addition, it includes power analyses for z tests and some exact tests. G*Power 3 provides improved effect size calculators and graphic options, supports both distribution-based and design-based input modes, and offers all types of power analyses in which users might be interested. Like its predecessors, G*Power 3 is free.
Article
Iliotibial band syndrome (ITBS) is a common knee overuse injury among female runners. Atypical discrete trunk and lower extremity biomechanics during running may be associated with the etiology of ITBS. Examining discrete data points limits the interpretation of a waveform to a single value. Characterizing entire kinematic and kinetic waveforms may provide additional insight into biomechanical factors associated with ITBS. Therefore, the purpose of this cross-sectional investigation was to determine whether female runners with previous ITBS exhibited differences in kinematics and kinetics compared to controls using a principal components analysis (PCA) approach. Forty participants comprised two groups: previous ITBS and controls. Principal component scores were retained for the first three principal components and were analyzed using independent t-tests. The retained principal components accounted for 93-99% of the total variance within each waveform. Runners with previous ITBS exhibited low principal component one scores for frontal plane hip angle. Principal component one accounted for the overall magnitude in hip adduction which indicated that runners with previous ITBS assumed less hip adduction throughout stance. No differences in the remaining retained principal component scores for the waveforms were detected among groups. A smaller hip adduction angle throughout the stance phase of running may be a compensatory strategy to limit iliotibial band strain. This running strategy may have persisted after ITBS symptoms subsided.