Institute for Bioengineering of Catalonia (IBEC), Barcelona, Spain.
Ann Biomed Eng. 2011 Dec;39(12):2972-83. doi: 10.1007/s10439-011-0389-z. Epub 2011 Sep 2.
Lower limb amputation is a severe psychological and physical event in a patient. A prosthetic solution can be provided but should respond to a patient-specific need to accommodate for the geometrical and biomechanical specificities. A new approach to calculate the stress-strain state at the interaction between the socket and the stump of five transfemoral amputees is presented. In this study the socket donning procedure is modeled using an explicit finite element method based on the patient-specific geometry obtained from CT and laser scan data. Over stumps the mean maximum pressure is 4 kPa (SD 1.7) and the mean maximum shear stresses are 1.4 kPa (SD 0.6) and 0.6 kPa (SD 0.3) in longitudinal and circumferential directions, respectively. Locations of the maximum values are according to pressure zones at the sockets. The stress-strain states obtained in this study can be considered more reliable than others, since there are normal and tangential stresses associated to the socket donning procedure.
下肢截肢对患者来说是一个严重的身心事件。可以提供假肢解决方案，但应根据患者的具体需求来适应几何和生物力学的特殊性。本文提出了一种新的计算五名股骨截肢患者残端与接受腔相互作用时的应力-应变状态的方法。在本研究中，使用基于从 CT 和激光扫描数据获得的患者特定几何形状的显式有限元方法对接受腔佩戴过程进行建模。在残端上，平均最大压力为 4 kPa（标准差 1.7），平均最大剪切应力分别为 1.4 kPa（标准差 0.6）和 0.6 kPa（标准差 0.3），分别在纵向和周向。最大值的位置与接受腔的压力区域相对应。与接受腔佩戴过程相关联的法向和切向应力，使本研究中获得的应力-应变状态更可靠。
