Department of Mechanical Engineering, Universidad Nacional de Colombia, Medellin, Colombia.
Sci Rep. 2020 Mar 19;10(1):4985. doi: 10.1038/s41598-020-61915-1.
A Finite Element Analysis (FEA) was performed to evaluate the interaction between residual limb and socket when considering the dynamic loads of the gait cycle. Fourteen transfemoral amputees participated in this study, where their residual limbs (i.e., soft tissues and bone), and their sockets were reconstructed. The socket and the femur were defined as elastic materials, while the bulk soft tissues were defined as a hyperelastic material. Each model included the donning, standing, and gait cycle phase, with load and boundary conditions applied accordingly. The influence of adding the dynamic loads related to the gait cycle were compared against the modelling of the static load equivalent to the standing position resulting in changes of 23% ± 19% in the maximum values and in an increase in the size of the regions where they were located. Additionally, the possible correspondence between comfort and the location of peak loadbearing at the residual-limb/socket interface was explored. Consequently, the comfort perceived by the patient could be estimated based on the locations of the maximum stresses (i.e., if they coincide with the pressure tolerant or sensitive regions of the residual limb).
进行了有限元分析 (FEA)，以评估考虑步态周期动态载荷时残肢和接受腔之间的相互作用。14 名股骨截肢者参与了这项研究，他们的残肢（即软组织和骨骼）和接受腔都经过了重建。接受腔和股骨被定义为弹性材料，而大量软组织被定义为超弹性材料。每个模型都包括穿着、站立和步态周期阶段，并相应地施加载荷和边界条件。与模拟站立位置等效的静态载荷相比，添加与步态周期相关的动态载荷的影响导致最大值变化 23%±19%，并且位于这些最大值的区域的大小增加。此外，还探讨了残肢/接受腔界面上峰值承载位置与舒适度之间的可能对应关系。因此，可以根据最大应力的位置（即，如果它们与残肢的压力耐受或敏感区域重合）来估计患者的舒适度。
