Background

The socket reaction moment (SRM) has been reported to change because of alignment changes in transtibial prosthetic sockets. However, the influence of prosthetic foot alignment on SRM remains unclear.

Research question

Are SRMs predictable from alignment changes of prosthetic feet?

Methods

Ten users of transtibial prostheses participated in this study. Under five alignment conditions (3 ° plantarflexion and dorsiflexion, 6 ° inversion and eversion, and baseline alignment), temporal-spatial parameters and sagittal and coronal SRMs were measured during walking. Cadence, walking speed, step time, single support time, and step length were compared. The maximum/minimum SRM, % stance (timing) of the maximum/minimum SRM, Zero-cross, and SRMs at 5 %, 20 %, and 75 % stance were extracted and compared. Repeated measures analysis of variance or Friedman tests, and linear regression analyses were conducted for statistical analyses (i.e., alignment conditions as independent variables and SRM parameters as dependent variables).

Results

The SRMs at 5%, 20 %, and 75 % stance showed significant differences under coronal angular changes. The minimum SRM, % stance of the minimum/maximum SRM, and Zero-cross showed significant differences under sagittal alignment changes. In linear regression analysis, the minimum SRM, % stance of the minimum/maximum SRM, SRM at 20 % stance, and Zero-cross were significant dependent variables in the sagittal plane. The maximum/minimum SRM, SRM at 20 % and 75 % stance, and % stance of the minimum SRM were significant dependent variables in the coronal plane.

Significance

The results indicated that the changes in prosthetic feet angles may predict the magnitude of SRM (maximum/minimum SRM, SRM at 20 % and 75 % stance) in the coronal plane, and the timing of SRM (Zero-cross, % stance of the maximum/minimum SRM) in the sagittal plane. These findings suggest that the SRM may be useful for evaluating foot alignment in transtibial prostheses.

中文翻译：

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步行过程中假肢冠状和矢状面对线对胫骨假肢窝反应力矩的影响

背景

据报道，由于胫骨假肢关节窝的对齐变化，关节窝反应力矩 (SRM) 会发生变化。然而，假足对齐对 SRM 的影响仍不清楚。

研究问题

SRM 是否可以通过假脚的对齐变化来预测？

方法

十位胫骨假肢使用者参与了这项研究。在五种对齐条件下（3°跖屈和背屈，6°内翻和外翻，以及基线对齐），在行走过程中测量时空参数和矢状面和冠状面 SRM。比较步频、步行速度、步数、单次支撑时间和步长。提取并比较了最大/最小 SRM、最大/最小 SRM、过零和 SRM 的 5%、20% 和 75% 姿态的 % 姿态（时序）。对方差或弗里德曼检验进行重复测量分析，并进行线性回归分析以进行统计分析（即，对齐条件作为自变量，SRM 参数作为因变量）。

结果

5%、20% 和 75% 姿态下的 SRM 在冠状角变化下显示出显着差异。最小 SRM、最小/最大 SRM 的 % 姿态和过零在矢状对齐变化下显示出显着差异。在线性回归分析中，最小 SRM、最小/最大 SRM 的 % 姿态、20% 姿态的 SRM 和零交叉是矢状面中的重要因变量。最大/最小 SRM、20% 和 75% 姿态的 SRM 以及最小 SRM 的 % 姿态是冠状平面中的重要因变量。

意义

结果表明，假足角度的变化可以预测冠状面SRM（最大/最小SRM，SRM at 20 % and 75 % stance）的大小，以及SRM（Zero-cross，% stance of the矢状面上的最大/最小 SRM）。这些发现表明 SRM 可能有助于评估经胫假体的足部对齐。