Zhang M, Turner-Smith A R, Tanner A, Roberts V C
Department of Medical Engineering and Physics, King's College School of Medicine and Dentistry, London, UK.
Med Eng Phys. 1998 Apr;20(3):188-98. doi: 10.1016/s1350-4533(98)00013-7.
A system for measuring pressures and bi-axial shear stresses at the body support interfaces has been developed. This system has been used, in five unilateral trans-tibial amputees, to investigate the stresses at multiple points on the residual limb and prosthetic socket interface during standing and walking. The subjects investigated regularly used a patellar-tendon-bearing socket. The maximum peak pressure at the measured points was 320 kPa over the popliteal area during walking. The maximum shear stress was 61 kPa over the medial tibia area. Variable wave-forms of stress during walking were observed at the different measured points. The influence of the angular alignment on the stresses was investigated on one subject. It was found that a miss-alignment of +/- 8 degrees produced a change in peak longitudinal shear stress of between 8% and 11.5%.
已开发出一种用于测量身体支撑界面处压力和双轴剪应力的系统。该系统已用于五名单侧经胫骨截肢者，以研究站立和行走过程中残肢与假肢接受腔界面上多个点的应力。所研究的受试者经常使用髌腱承重接受腔。行走过程中，腘窝区域测量点处的最大峰值压力为320 kPa。胫骨内侧区域的最大剪应力为61 kPa。在不同测量点观察到行走过程中应力的波形变化。对一名受试者研究了角度对线对应力的影响。发现±8度的对线不良会使峰值纵向剪应力产生8%至11.5%的变化。
