The lower extremity biomechanics of single- and double-leg stop-jump tasks

Department of Physical Education and Kinesiology, National Dong Hwa University , Taiwan (R.O.C.).
Journal of sports science & medicine (Impact Factor: 1.03). 03/2011; 10(1):151-6.
Source: PubMed


The anterior cruciate ligament (ACL) injury is a common occurrence in sports requiring stop-jump tasks. Single- and double-leg stop-jump techniques are frequently executed in sports. The higher risk of ACL injury in single-leg drop landing task compared to a double-leg drop landing task has been identified. However the injury bias between single- and double-leg landing techniques has not been investigated for stop-jump tasks. The purpose of this study was to determine the differences between single- and double-leg stop-jump tasks in knee kinetics that were influenced by the lower extremity kinematics during the landing phase. Ground reaction force, lower extremity kinematics, and knee kinetics data during the landing phase were obtained from 10 subjects performing single- and double-leg stop-jump tasks, using motion-capture system and force palates. Greater peak posterior and vertical ground reaction forces, and peak proximal tibia anterior and lateral shear forces (p < 0.05) during landing phase were observed of single-leg stop-jump. Single-leg stopjump exhibited smaller hip and knee flexion angle, and knee flexion angular velocity at initial foot contact with the ground (p < 0.05). We found smaller peak hip and knee flexion angles (p < 0.05) during the landing phase of single-leg stop-jump. These results indicate that single-leg landing may have higher ACL injury risk than double-leg landing in stop-jump tasks that may be influenced by the lower extremity kinematics during the landing phase.

  • Source
    • "In addition, it was hypothesized that significant correlations would be found between most landing and squat tasks for maximum knee flexion angles, maximum hip flexion angles, maximum hip adduction angles, maximum knee abduction angles, and maximum external knee abduction moments. METHODS Participants Based on previous studies (Atkin et al., 2014; Butler et al., 2012; Earl et al., 2007; Stensrud et al., 2011; Wang, 2011; Yeow et al., 2010, 2011), a mediumto-large effect size was expected for the differences and correlations in kinematic and kinetic variables during landing and squat tasks. Assuming a Cohen's f of 0.25 for analysis of variance (ANOVA), a sample size of 24 was needed for a Type I error at the level of 0.05 to achieve a power of 0.8. "
    [Show abstract] [Hide abstract]
    ABSTRACT: Landing and squat tasks have been utilized to assess lower extremity biomechanics associated with anterior cruciate ligament loading and injury risks. The purpose of this study was to identify the differences and correlations in knee and hip mechanics during a single-leg landing, a single-leg squat, a double-leg landing, and a double-leg squat. Seventeen male and 17 female recreational athletes performed landings and squats when kinematic and kinetic data were collected. ANOVAs showed significant differences (p < 0.00001) for maximum knee flexion angles, maximum hip flexion angles, maximum knee abduction angles, maximum hip adduction angles, and maximum external knee abduction moments among squats and landings. For maximum knee and hip flexion angles, significant correlations (r ≥ 0.5, p ≤ 0.003) were observed between the two landings and between the two squats. For maximum knee abduction and hip adduction angles and maximum external knee abduction moments, significant correlations were mostly found between the two landings, and between the single-leg squat and landings (r ≥ 0.54, p ≤ 0.001). Individuals are likely to demonstrate different profiles of injury risks when screened using different tasks. While a double-leg landing should be considered as a priority in screening, a single-leg squat may be used as a surrogate to assess frontal plane motion and loading.
    Full-text · Article · Aug 2015 · Research in Sports Medicine An International Journal
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Background and aim: Volleyball is one of the most popular sports in the world and knee injury is a common occurrence in volleyball. The purpose of this study was the relationship between range of motion, angular velocity, shearing force and reaction force of lower extremity of jump serve in male volleyball players. Materials and methods: The study samples consisted of 15 healthy male volleyball players which performed jump serve skill. All kinetics and kinematics data from ForcePlate and Motion Analysis System were used in Matlab for inverse dynamic analysis. Pearson's correlation coefficient was used to examine the relationship between the data. Results: During volleyball jump serve, kinetic and kinematic variables correlation coefficient values of lower extremity show negative correlation in peak knee proximal tibia anterior shear force with knee flexion angle (r = 0.111), hip flexion angle (r = 0.109), and knee flexion angular velocity (r = 0.118); and peak vertical ground reaction force with knee flexion angle (r = 0.570), and hip flexion angle (r = 529). Conclusion: The results of this study indicate that lower extremity biomechanics of jump serve is particular important. This means ACL injuries can be prevented after recognizing of kinetics and kinematics factors. Collectively, it is suggested that athletes and coaches use the knowledge of biomechanics in sport skills for decreasing and preventing the sport injuries.
    Full-text · Article · Oct 2014
  • [Show abstract] [Hide abstract]
    ABSTRACT: The present study aimed to clarify the asymmetry between the dominant (DL) and non-dominant takeoff legs (NDL) in terms of lower limb behavior during running single leg jumps (RSJ) in collegiate male basketball players in relation to that of the jump height. Twenty-seven players performed maximal RSJ with a 6 m approach. Three-dimensional kinematics data during RSJ was collected using a 12 Raptor camera infrared motion analysis system (MAC 3D system) at a sampling frequency of 500 Hz. The symmetry index in the jump heights and the kinematics variables were calculated as {2 × (DL - NDL) / (DL + NDL)} × 100. The run-up velocity was similar between the two legs, but the jump height was significantly higher in the DL than in the NDL. During the takeoff phase, the joint angles of the ankle and knee were significantly larger in the DL than the NDL. In addition, the contact time for the DL was significantly shorter than that for the NDL. The symmetry index of the kinematics for the ankle joint was positively correlated with that of jump height, but that for the knee joint was not. The current results indicate that, for collegiate basketball players, the asymmetry in the height of a RSJ can be attributed to that in the joint kinematics of the ankle during the takeoff phase, which may be associated with the ability to effectively transmit run-up velocity to jump height. Key pointsAsymmetry of height during running single leg jump between two legs is due to the behavior of the ankle joint (i.e. stiffer the ankle joint and explosive bounding).The dominant leg can transmit run-up velocity into the vertical velocity at takeoff phase to jump high compared with the non-dominant leg.Basketball players who have a greater asymmetry of the RSJ at the collegiate level could be assessed as non-regulars judging by the magnitude of asymmetry.
    No preview · Article · Dec 2014 · Journal of sports science & medicine
Show more