Tang Jinghua, McGrath Michael, Laszczak Piotr, Jiang Liudi, Bader Dan L, Moser David, Zahedi Saeed
Faculty of Engineering and the Environment, University of Southampton, UK.
Faculty of Engineering and the Environment, University of Southampton, UK.
Med Eng Phys. 2015 Dec;37(12):1162-8. doi: 10.1016/j.medengphy.2015.10.004. Epub 2015 Oct 30.
Design and fitting of artificial limbs to lower limb amputees are largely based on the subjective judgement of the prosthetist. Understanding the science of three-dimensional (3D) dynamic coupling at the residuum/socket interface could potentially aid the design and fitting of the socket. A new method has been developed to characterise the 3D dynamic coupling at the residuum/socket interface using 3D motion capture based on a single case study of a trans-femoral amputee. The new model incorporated a Virtual Residuum Segment (VRS) and a Socket Segment (SS) which combined to form the residuum/socket interface. Angular and axial couplings between the two segments were subsequently determined. Results indicated a non-rigid angular coupling in excess of 10° in the quasi-sagittal plane and an axial coupling of between 21 and 35 mm. The corresponding angular couplings of less than 4° and 2° were estimated in the quasi-coronal and quasi-transverse plane, respectively. We propose that the combined experimental and analytical approach adopted in this case study could aid the iterative socket fitting process and could potentially lead to a new socket design.
下肢截肢者的假肢设计与适配很大程度上基于假肢师的主观判断。了解残肢/接受腔界面处的三维（3D）动态耦合科学，可能有助于接受腔的设计与适配。基于一名经股骨截肢者的单病例研究，已开发出一种利用3D运动捕捉来表征残肢/接受腔界面处3D动态耦合的新方法。新模型纳入了虚拟残肢段（VRS）和接受腔段（SS），二者结合形成残肢/接受腔界面。随后确定了两段之间的角向耦合和轴向耦合。结果表明，在准矢状面内非刚性角向耦合超过10°，轴向耦合在21至35毫米之间。在准冠状面和准横断面内，相应的角向耦合估计分别小于4°和2°。我们认为，本病例研究中采用的实验与分析相结合的方法，有助于迭代接受腔适配过程，并可能带来新的接受腔设计。
