The sit-to-stand movement can be challenging for people with a transtibial amputation (TTA). The alignment of the prosthesis may influence the movement strategies people with TTA use to transfer from sit-to-stand by affecting foot placement. The purpose of this study was to determine how shifting the prosthetic foot anterior and posterior relative to the socket affects movement strategies used to transfer from sit-to-stand. To aid in interpretation, we compared movement strategies between people with and without TTA. Nine people with TTA and nine sex-, and age-matched non-amputee controls completed five self-paced sit-to-stand trials. With the posterior alignment, participants with TTA had 1) smaller braking GRF impulse on the prosthetic side and greater impulse on the intact side compared to the anterior alignment, 2) no significant differences between sides, which suggests greater braking impulse symmetry compared to anterior and prescribed alignments, and 3) smaller axial trunk range of motion compared to the prescribed alignment. There were also differences between participants with TTA and controls in braking GRF impulse, knee extension moment, anterior/posterior center of pressure position, and lateral and axial trunk range of motion. Based on these results, shifting the prosthetic foot posterior to the socket may be a useful tool to reduce braking impulse asymmetry and trunk motion in people with TTA during sit-to-stand. Thus, prosthetic alignment can have important implications for the comfort and ability of people with TTA to transfer from sit-to-stand as well as for development of secondary health conditions like low back pain, which is associated with compensatory movements.

坐直站立运动对胫骨截肢（TTA）的人可能具有挑战性。假体的对齐方式可能会影响TTA患者从脚坐到站立时所采用的运动策略，从而影响其脚的放置。这项研究的目的是确定假脚相对于窝的前后移动如何影响从坐到站转移的运动策略。为了帮助解释，我们比较了有和没有TTA的人之间的运动策略。九名患有TTA的人以及九名性别和年龄相匹配的非截肢者对照者完成了五项自定进度的坐立试验。进行后路对准时，与前路对准相比，TTA参与者1）假体一侧的制动GRF冲动较小，而在完好一侧的制动冲动更大，2）两侧之间无显着差异，这表明与前对齐和规定的对齐方式相比，制动脉冲的对称性更高； 3）与处方的对齐方式相比，轴干的运动范围较小。患有TTA的参与者与对照组之间在制动GRF脉冲，膝盖伸展力矩，压力位置的前/后中心以及躯干的横向和轴向躯干范围方面也存在差异。基于这些结果，将义肢脚向插槽后方移动可能是一种有用的工具，可减少坐着站立时TTA患者的制动脉冲不对称性和躯干运动。因此，假体对准对于TTA患者从坐姿到站立姿势的舒适性和能力以及对下腰痛，