Individuals with transtibial amputation exhibit altered movement strategy to sustain stability during quiet standing due to reduced proprioception on the amputated limb. The aim of this study is to determine the movement strategies in anterior–posterior and medial–lateral directions in predicting the overall postural stability. In this crossover study, postural stability of ten transtibial amputees was assessed using computed posturography while wearing different prosthetic foot types: solid ankle cushion heel (SACH), single axis (SA) and energy storage and return (ESAR). Three stability indices were measured during four conditions: standing with eyes opened and closed, standing on compliant surface and standing with tilted head. From the standard multiple regression analysis, 63% to 99% of the OSI score in all sensory conditions were explained from the MLSI score, while 11% to 56% from the APSI score. The Pearson’s [Formula: see text] indicated significant strong positive relationship between OSI and MLSI [Formula: see text]–[Formula: see text] during all sensory conditions. The APSI score was significantly lower than OSI during eyes-closed and head extended conditions for all prosthetic feet [Formula: see text]. Adjustments in postural stability strategies in transtibial amputees mostly occurred in medial–lateral direction regardless of prosthetic feet types and altered sensory conditions.

中文翻译：

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穿三种假脚在改变的感觉条件下安静站立时胫骨截肢者的姿势稳定性策略

由于截肢的本体感觉减少，患有经胫截肢的个体表现出改变的运动策略以在安静站立期间维持稳定性。本研究的目的是确定前后和内侧-外侧方向的运动策略，以预测整体姿势稳定性。在这项交叉研究中，十名经胫骨截肢者的姿势稳定性在穿着不同类型的假足时使用计算机姿势图进行评估：实心踝垫脚跟 (SACH)、单轴 (SA) 和能量储存和返回 (ESAR)。在四种情况下测量了三个稳定性指标：睁眼和闭眼站立、站在柔顺的表面上和倾斜头部站立。从标准多元回归分析，在所有感觉条件下，63% 至 99% 的 OSI 评分由 MLSI 评分解释，而 11% 至 56% 来自 APSI 评分。Pearson 的 [公式：见正文] 表明，在所有感觉条件下，OSI 和 MLSI [公式：见正文]-[公式：见正文] 之间存在显着的强正相关关系。在所有假足的闭眼和头部伸展条件下，APSI 评分显着低于 OSI [公式：见正文]。无论假肢类型和感觉条件如何变化，胫骨截肢者姿势稳定性策略的调整大多发生在内侧 - 外侧方向。在所有假足的闭眼和头部伸展条件下，APSI 评分显着低于 OSI [公式：见正文]。无论假肢类型和感觉条件如何变化，胫骨截肢者姿势稳定性策略的调整大多发生在内侧 - 外侧方向。在所有假足的闭眼和头部伸展条件下，APSI 评分显着低于 OSI [公式：见正文]。无论假肢类型和感觉条件如何变化，胫骨截肢者姿势稳定性策略的调整大多发生在内侧 - 外侧方向。