Background

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.

Research question

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.

Methods

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).

Results

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).

Significance

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.

中文翻译：

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长时间负重行走对膝关节内收生物力学的影响

背景

遭受与服役相关的膝关节肌肉骨骼损伤的士兵通常会患上关节骨关节炎。膝关节骨关节炎在士兵中是一个严重且代价高昂的问题，但尚不清楚身体承受的负荷和步行时间如何影响膝关节内收生物力学与骨关节炎的进展和严重程度。

研究问题

本研究确定了在长时间负重行走过程中膝关节内收角 (KAA) 和力矩 (KAM) 的幅度和可变性的适应性。

方法

13 名休闲活跃的参与者在以 1.3 m/s 的速度在地面上行走 60 分钟并承受三种身体负荷（0、15 和 30 kg）时对膝关节生物力学进行了量化。量化 KAA 和 KAM 测量的幅度和可变性并提交给 RM ANOVA，以测试负载（0、15 和 30 公斤）和时间（0、15、30、45 和 60 分钟）之间的主要影响和相互作用。

结果

身体负荷增加了 KAM 峰值（p < 0.001），而时间增加了 KAA 的峰值和范围（两者：p < 0.001）。具体来说，每增加一次身体负荷，KAM 峰值都会增加（均：p < 0.025），步行 30 分钟后，KAA 的峰值和范围会增加（均：p < 0.040）。身体负荷和时间都对 KAA 或 KAM 变异性没有显着影响（两者：p > 0.05）。

意义

长时间负重行走会增加与骨关节炎相关的膝关节内收生物力学。在 KAM 峰值时增加重体负重会增加，而步行时间会增加 KAA，膝关节生物力学可能会增加内侧膝关节隔室的负荷和关节处 OA 的风险。