This project aimed to investigate the residual limb stress of a transfemoral amputee's Compression/Release Stabilized (CRS) socket by finite elemental modelling. The model was constructed from magnetic resonance images of the left residual limb of a 48-year-old male transfemoral amputee. Two conditions were simulated. In the donning condition, the prosthetic socket under the residual limb moved proximally until it reached the required donned position. The weight-bearing condition was subsequently simulated by applying body weight (800N) at the femoral head while keeping the distal end of the socket fixed. The maximum contact pressure was concentrated at the proximal anterior-medial regions of the residual limb surfaces in both conditions. In the donning condition, the maximum von Mises stress and the maximum contact pressure were 277.7 kPa and 254 kPa respectively. The respective values were 191.9 kPa and 218.5 kPa when body weight was applied. The stress and contact pressure did not exceed the suggested threshold value of pain. Our findings provide important biomechanical information on the CRS socket that may help future design optimization.

该项目旨在通过有限元建模研究经股截肢者的压缩/释放稳定 (CRS) 套筒的残余肢体应力。该模型是根据一名 48 岁男性经股截肢者左侧残肢的磁共振图像构建的。模拟了两种条件。在穿戴状态下，残肢下方的假肢窝向近端移动，直至到达所需的穿戴位置。随后通过在股骨头上施加体重 (800N) 同时保持关节窝远端固定来模拟负重状态。在两种情况下，最大接触压力都集中在残肢表面的近端前内侧区域。在穿戴条件下，最大 von Mises 应力和最大接触压力为 277。分别为 7 kPa 和 254 kPa。当施加体重时，各自的值是191.9 kPa和218.5 kPa。压力和接触压力没有超过建议的疼痛阈值。我们的发现为 CRS 插座提供了重要的生物力学信息，可能有助于未来的设计优化。