Dept. of Kinesiology, Boise State University, Boise, ID, USA.
Dept. of Kinesiology, Boise State University, Boise, ID, USA.
Gait Posture. 2021 Feb;84:192-197. doi: 10.1016/j.gaitpost.2020.12.004. Epub 2020 Dec 17.
Soldiers that suffer a service-related knee musculoskeletal injury routinely develop joint osteoarthritis. Knee osteoarthritis is a substantial and costly problem among soldiers, yet it is unknown how body borne load and duration of walking impact knee adduction biomechanics linked to progression and severity of osteoarthritis.
This study determined the adaptations in magnitude and variability of knee adduction joint angle (KAA) and moment (KAM) during prolonged walking with body borne load.
Thirteen recreationally active participants had knee biomechanics quantified while walking over-ground for 60-min at 1.3 m/s with three body borne loads (0, 15, and 30 kg). Magnitude and variability of KAA and KAM measures were quantified and submitted to a RM ANOVA to test the main effect and interactions between load (0, 15 and 30 kg) and time (0, 15, 30, 45 and 60 min).
Body borne load increased peak KAM (p < 0.001), whereas time increased peak and range of KAA (both: p < 0.001). Specifically, peak KAM increased with each addition of body borne load (all: p < 0.025), and peak and range of KAA increased after 30 min of walking (both: p < 0.040). Neither body borne load, nor time had a significant effect on KAA or KAM variability (both: p > 0.05).
Prolonged walking with heavy body borne load increased knee adduction biomechanics related to osteoarthritis. Adding heavy body borne load increased in peak KAM whereas duration of walking increased KAA, knee biomechanics that may increase loading of the medial knee joint compartment and risk of OA at the joint.
与服役相关的膝关节肌肉骨骼损伤的士兵通常会发展为关节骨关节炎。膝关节骨关节炎是士兵中一个重大且代价高昂的问题，但目前尚不清楚身体负荷和行走时间如何影响与骨关节炎进展和严重程度相关的膝关节内收生物力学。
本研究旨在确定在携带身体负荷进行长时间行走时，膝关节内收角度（KAA）和膝关节内收力矩（KAM）幅度和可变性的适应性。
13 名业余活跃的参与者在以 1.3m/s 的速度在地面上行走 60 分钟时，分别携带 0、15 和 30kg 的三种身体负荷，对其膝关节生物力学进行了量化。对 KAA 和 KAM 测量的幅度和可变性进行量化，并提交给 RM ANOVA 以检验负荷（0、15 和 30kg）和时间（0、15、30、45 和 60 分钟）之间的主要影响和相互作用。
身体负荷增加了峰值 KAM（p<0.001），而时间增加了 KAA 的峰值和范围（均为 p<0.001）。具体而言，随着身体负荷的增加，峰值 KAM 也随之增加（均为 p<0.025），而 KAA 的峰值和范围在行走 30 分钟后增加（均为 p<0.040）。身体负荷和时间均对 KAA 或 KAM 的可变性没有显著影响（均为 p>0.05）。
携带重物长时间行走会增加与骨关节炎相关的膝关节内收生物力学。增加重物负荷会增加峰值 KAM，而行走时间的增加会增加 KAA，这些生物力学可能会增加内侧膝关节关节间隙的负荷，并增加关节发生骨关节炎的风险。
