Individuals with unilateral transtibial amputations experience greater work demand and loading on the intact limb compared with the prosthetic limb, placing this limb at a greater risk of knee joint degenerative conditions. It is possible that increased loading on the intact side may occur due to strength deficits and joint absorption mechanics. This study investigated the intact limb mechanics utilized to attenuate load, independent of prosthetic limb contributions and requirements for forward progression, which could provide an indication of deficiencies in the intact limb. Amputee and healthy control participants completed 3 unilateral drop landings from a 30-cm drop height. Joint angles at touchdown; range of motion; coupling angles; peak powers; and negative work of the ankle, knee, and hip were extracted together with isometric quadriceps strength measures. No significant differences were found in the load or movement mechanics (P ≥ .31, g ≤ 0.42), despite deficits in isometric maximum (20%) and explosive (25%) strength (P ≤ .13, g ≥ 0.61) in the intact limb. These results demonstrate that, when the influence from the prosthetic limb and task demand are absent, and despite deficits in strength, the intact limb adopts joint mechanics similar to able-bodied controls to attenuate limb loading.

中文翻译：

---

在执行单侧跌落着陆时减弱小腿截肢者完整肢体负载的机制。

与假肢相比，单侧经胫骨截肢的个体会经历更大的工作需求和对完整肢体的负荷，使该肢体面临更大的膝关节退行性疾病风险。由于强度不足和关节吸收力学，完好侧的负载可能会增加。这项研究调查了用于减轻负荷的完整肢体力学，独立于假肢贡献和向前进展的要求，这可以提供完整肢体缺陷的指示。截肢者和健康对照参与者完成了 3 次从 30 厘米跌落高度单侧跌落着陆。接地时的关节角度；活动范围; 耦合角；峰值功率；踝关节、膝关节和髋关节的负功与等长股四头肌力量测量一起提取。尽管在等距最大强度 (20%) 和爆炸强度 (25%) 方面存在缺陷 (P ≤ .13，g ≥ 0.61)，但在负载或运动力学方面没有发现显着差异 (P ≥ .31，g ≤ 0.42)。完整的肢体。这些结果表明，当不存在假肢和任务需求的影响时，尽管力量不足，完整的肢体仍会采用类似于健全人控制的关节力学来减轻肢体负荷。