Department of Biomechanics, University of Nebraska at Omaha, 6160 University Dr S, Omaha, NE 68182, USA.
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.
Knee. 2021 Aug;31:118-126. doi: 10.1016/j.knee.2021.05.007. Epub 2021 Jun 13.
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.
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.
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.
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.
运动力学改变是 ACL 损伤的一个风险因素。虽然髋外展肌力量不足已被证明会对落地生物力学产生负面影响，但这种肌肉力量与损伤风险的关系尚不清楚。本肌肉骨骼模拟研究的目的是确定髋外展肌疲劳导致的无力对单腿落地时 ACL 负荷、下肢肌肉力和下肢生物力学的影响。
在疲劳方案前后收集了十名健康成年人的生物力学数据，并使用五自由度（DOF）模型得出了肌肉力量和 ACL 负荷的个体估计值。
疲劳前后膝关节角度和 ACL 负荷没有显著差异。然而，由于疲劳，出现了明显的差异，包括侧躯干前屈角度、躯干总位移、肌肉力量和关节力矩。
由于髋外展肌疲劳导致的无力，落地力学发生改变，可能与单腿落地时 ACL 损伤的风险增加有关。在动态运动中，基于个体的肌肉骨骼模型的临床评估或 ACL 损伤风险筛查将获益。需要进一步研究不同类型的疲劳方案、认知负荷和各种任务，以确定髋外展肌无力对下肢落地生物力学的影响。
