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Publications (47)
Background:
People with patellofemoral pain (PFP) exhibit impaired psychological and pain processing factors (i.e., kinesiophobia, pain catastrophizing and pressure pain thresholds [PPTs]). However, it remains unclear whether these factors have different presentations in women and men with PFP, as well as whether their correlation with clinical ou...
Patellofemoral pain is a prevalent condition among physically active individuals.
Patellofemoral pain (PFP) is a chronic condition that presents with patellar pain during various daily and recreational activities. Individuals with PFP have a wide range of impairments that result in long-term disability and reduced quality of life. Current interventions target hip muscle weakness with strength-based exercises, but recurrence rate...
Female soccer athletes are at greater risk for anterior cruciate ligament injury compared with males. Risk factors include altered landing biomechanics and diminished core neuromuscular control, measured using advanced laboratory equipment. There is a need for a clinical measure of core muscle function to better understand kinesiological factors wi...
Objectives
Patellofemoral pain (PFP) is a common lower extremity condition that results in pain during functional tasks. Currently, it is unknown the extent to which differences in pain levels exist in individuals with PFP compared to asymptomatic controls during functional task and if pain differ across various functional tasks. The purpose of thi...
Context: Anterior knee pain (AKP) is ubiquitous in early-career military members and exacerbated during functional tasks required during military duties. Therefore, it is important to understand risk of this condition in male and female tactical athletes in diverse military occupations.
Objective: To assess sex and occupation on AKP risk in militar...
Objective
To compare T1ρ relaxation times of the medial and lateral regions of the patella and femoral trochlea at 6 and 12 months post‐anterior cruciate ligament reconstruction (ACLR) on the ACLR and contralateral limb. Greater T1ρ relaxation times are associated with a lesser proteoglycan density of articular cartilage.
Methods
Twenty individual...
Background: Anterior knee pain (AKP) is commonly diagnosed in military members and is a threat to operational readiness. AKP includes a range of conditions, with localized pain around the patella being a frequent location of pain and disability. Mechanical overuse is one suggested etiology for many of these conditions, suggesting occupational deman...
Recent research indicates that distance running stride-to-stride variability (SSV) is related to performance and injury. Previous studies have primarily focused on stride characteristics (stride length and time). We assessed SSV for sagittal plane joint angles with the primary purpose of testing for significant differences among the lower body join...
Objective:
To determine the association between selected biomechanical variables and risk of patellofemoral pain (PFP) in males and females.
Design:
Prospective cohort.
Setting:
US Service Academies.
Participants:
Four thousand five hundred forty-three cadets (1727 females and 2816 males).
Assessment of risk factors:
Three-dimensional biom...
Objective: :
To present recommendations for athletic trainers and other health care providers regarding the identification of risk factors for and management of individuals with patellofemoral pain (PFP).
Background: :
Patellofemoral pain is one of the most common knee diagnoses; however, this condition continues to be one of the most challengin...
Influence of Trunk and Pelvis Motion, and Hip Strength on Lower Extremity Kinematics During a Single Leg Landing in Youth Athletes
Objectives:
To determine if static balance, dynamic balance, ankle range of motion, body mass index (BMI), or history of an ankle sprain were associated with ankle sprain injuries within male and female collegiate athletes.
Design:
Prospective cohort.
Methods:
Three hundred and eighty-four male (age=19.79±1.80 years, height=178.02±10.39cm, mas...
Study Design
Case-control.
Objectives
To determine if the Y-Balance Test (YBT) can discriminate between collegiate athletes with and without a history of ankle sprain injury.
Background
Performance on the YBT has been a predictor of lower extremity injury risk in collegiate athletes. However, it is unknown if the YBT can detect residual postural...
Context:
Risk of ACL injuries in young female athletes increases with age, appearing to peak during maturation. Changes in hip muscle strength and range of motion (ROM) during this time may contribute to altered dynamic movement patterns that are known to increase risk of ACL injuries. Understanding the longitudinal changes in hip strength and ROM...
Understanding how neuromuscular factors that are associated with lower extremity injury risk, such as landing kinematics, muscle strength and flexibility, change as children mature may enhance age-specific recommendations for injury prevention programs. The purpose of this study was to compare these factors in prepubertal, pubertal and postpubertal...
The ankle, knee, and hip joints work together in the sagittal plane to absorb landing forces. Reduced sagittal plane motion at the ankle may alter landing strategies at the knee and hip, potentially increasing injury risk; however, no studies have examined the kinematic relationships between the joints during jump-landings. Healthy adults (N = 30;...
Decreased strength of the hip musculature and altered mechanics of the lower extremity have been identified in individuals with patellofemoral pain (PFP). The aim of this study was to determine if a relationship exists between hip muscle strength and transverse and frontal plane motion at the hip and knee, and ipsilateral trunk flexion during a jum...
Context:
Accurate, efficient, and reliable measurement methods are essential to prospectively identify risk factors for knee injuries in large cohorts.
Objective:
To determine tester reliability using digital photographs for the measurement of static lower extremity alignment (LEA) and whether values quantified with an electromagnetic motion-tra...
Decreased sagittal-plane motion at the knee during dynamic tasks has been reported to increase impact forces during landing, potentially leading to knee injuries such as anterior cruciate ligament rupture.
To describe the relationship between lower extremity muscle activity and knee-flexion angle during a jump-landing task.
Cross-sectional study.
R...
Limitations in gastrocnemius/soleus flexibility that restrict ankle dorsiflexion during dynamic tasks have been reported in individuals with patellofemoral pain (PFP) and are theorized to play a role in its development.
To determine the effect of restricted ankle-dorsiflexion range of motion (ROM) on lower extremity kinematics and muscle activity (...
Patellofemoral pain syndrome (PFPS) is one of the most common and clinically challenging knee pathologies. Historically, clinicians have used a myriad of interventions, many of which have benefited some but not all patients. Suboptimal outcomes may reflect the need for an evidence-based approach for the treatment of PFPS. The authors believe that i...
There is a need for reliable clinical assessment tools that can be used to identify individuals who may be at risk for injury. The Landing Error Scoring System (LESS) is a reliable and valid clinical assessment tool that was developed to identify individuals at risk for lower extremity injuries. One limitation of this tool is that it cannot be asse...
Anterior cruciate ligament injuries are common in athletes and have serious sequelae. A valid clinical tool that reliably identifies individuals at an increased risk for ACL injury would be highly useful for screening sports teams, because individuals identified as "high-risk" could then be provided with intensive prevention programs.
A clinical sc...
Patellofemoral pain syndrome is one of the most common chronic knee injuries; however, little research has been done to determine the risk factors for this injury.
Altered lower extremity kinematics and kinetics, decreased strength, and altered postural measurements will be risk factors.
Cohort study (prognosis); Level of evidence, 2.
A total of 15...
To determine the extent to which select lower extremity alignment characteristics of the pelvis, hip, knee, and foot are related to the Q angle.
Descriptive cohort study design.
Applied Neuromechanics Research Laboratory.
Two hundred eighteen participants (102 males, 116 females).
Eight clinical measures of static alignment of the left lower extrem...
Individuals suffering from patellofemoral pain have previously been reported to have decreased isometric strength of the hip musculature; however, no researchers have investigated concentric and eccentric torque of the hip musculature in individuals with patellofemoral pain.
To compare concentric and eccentric torque of the hip musculature in indiv...
Eccentric quadriceps contraction during landing and the resulting anterior tibial shear force are anterior cruciate ligament injury risk factors, while hamstring contraction limits anterior cruciate ligament loading. Anterior tibial shear force is derived from quadriceps and hamstring co-contraction, and a greater quadriceps/hamstring strength rati...
The objective of this study was to utilise an ultrasonic technique to assess the effect of patellofemoral pain syndrome (PFPS) on the mechanical properties of the patellar tendon. Seven subjects with PFPS and seven matched control subjects volunteered to participate in this study. Subjects were asked to perform isometric maximal voluntary contracti...
To determine the effects of a weight-bearing rehabilitation program on quadriceps and gluteus medius electromyographic activity, pain, and function in subjects diagnosed with patellofemoral pain syndrome (PFPS).
Pretest and posttest 6-week intervention study.
Musculoskeletal research laboratory.
Fourteen subjects diagnosed with PFPS and 14 healthy...
Context
Clinicians commonly attempt to facilitate vastus medialis oblique (VMO) activity by instructing patients to squeeze a ball between their knees during squatting exercises.
Objective
To determine whether VMO activation amplitude and the VMO to vastus lateralis (VL) activation ratio (VMO:VL) were altered when performing active hip adduction d...
CONTEXT: Limitations in gastrocnemius/soleus flexibility, which restricts ankle dorsiflexion during dynamic tasks, have been reported in individuals with patellofemoral pain (PFP) and are theorized to play a role in the development of PFP. OBJECTIVE: To determine the effect of restricted ankle dorsiflexion range of motion (ROM) on lower extremity k...
Thesis (M.S. Edu.)--University of Kentucky, 2004. Abstract ([1]) leaf) bound with copy. Vita. Includes bibliographical references (leaves 101-105).
