Namwoong Kim1, Sae Yong Lee2, Sung-Cheol Lee3, Adam B Rosen4, Terry L Grindstaff5, Brian A Knarr6. 1. Department of Biomechanics, University of Nebraska at Omaha, 6160 University Dr S, Omaha, NE 68182, USA. Electronic address: namwoongkim@unomaha.edu. 2. Department of Physical Education, Yonsei University, 50 Yonsei-ro, Sports Science Complex, Seoul 03722, South Korea; International Olympic Committee Research Centre KOREA, Yonsei University, 50 Yonsei-ro, Sports Science Complex, Seoul 03722, South Korea; Institute of Convergence Science, Yonsei University, 50 Yonsei-ro, Sports Science Complex, Seoul 03722, South Korea. 3. Department of Physical Education, Yonsei University, 50 Yonsei-ro, Sports Science Complex, Seoul 03722, South Korea; Institute of Convergence Science, Yonsei University, 50 Yonsei-ro, Sports Science Complex, Seoul 03722, South Korea. 4. School of Health and Kinesiology, University of Nebraska at Omaha, 6160 University Dr S, Omaha, NE 68182, USA. 5. School of Pharmacy and Health Professions, Creighton University, 2500 California Plaza, Boyne Building, Omaha, NE 68178, USA. 6. Department of Biomechanics, University of Nebraska at Omaha, 6160 University Dr S, Omaha, NE 68182, USA.
Abstract
BACKGROUND: Altered movement biomechanics are a risk factor for ACL injury. While hip abductor weakness has been shown to negatively impact landing biomechanics, the role of this musculature and injury risk is not clear. The aim of this musculoskeletal simulation study was to determine the effect of hip abductor fatigue-induced weakness on ACL loading, force production of lower extremity muscles, and lower extremity biomechanics during single-leg landing. METHODS: Biomechanical data from ten healthy adults were collected before and after a fatigue protocol and used to derive subject-specific estimates of muscle forces and ACL loading using a 5-degree of freedom (DOF) model. RESULTS: There were no significant differences in knee joint angles and ACL loading between pre and post-fatigue. However, there were significant differences, due to fatigue, in lateral trunk flexion angle, total excursion of trunk, muscle forces, and joint moments. CONCLUSION: Altered landing mechanics, due to hip abductor fatigue-induced weakness, may be associated with increased risk of ACL injury during single-leg landings. Clinical assessment or screening of ACL injury risk will benefit from subject-specific musculoskeletal models during dynamic movements. Future study considering the type of the fatigue protocols, cognitive loads, and various tasks is needed to further identify the effect of hip abductor weakness on lower extremity landing biomechanics. Published by Elsevier B.V.
BACKGROUND: Altered movement biomechanics are a risk factor for ACL injury. While hip abductor weakness has been shown to negatively impact landing biomechanics, the role of this musculature and injury risk is not clear. The aim of this musculoskeletal simulation study was to determine the effect of hip abductor fatigue-induced weakness on ACL loading, force production of lower extremity muscles, and lower extremity biomechanics during single-leg landing. METHODS: Biomechanical data from ten healthy adults were collected before and after a fatigue protocol and used to derive subject-specific estimates of muscle forces and ACL loading using a 5-degree of freedom (DOF) model. RESULTS: There were no significant differences in knee joint angles and ACL loading between pre and post-fatigue. However, there were significant differences, due to fatigue, in lateral trunk flexion angle, total excursion of trunk, muscle forces, and joint moments. CONCLUSION: Altered landing mechanics, due to hip abductor fatigue-induced weakness, may be associated with increased risk of ACL injury during single-leg landings. Clinical assessment or screening of ACL injury risk will benefit from subject-specific musculoskeletal models during dynamic movements. Future study considering the type of the fatigue protocols, cognitive loads, and various tasks is needed to further identify the effect of hip abductor weakness on lower extremity landing biomechanics. Published by Elsevier B.V.
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