Sanders J E, Lam D, Dralle A J, Okumura R
Center for Bioengineering, University of Washington, Seattle 98195, USA.
J Rehabil Res Dev. 1997 Jan;34(1):19-43.
Residual limb/prosthetic socket interface pressures and shear stresses were measured at 13 sites on two subjects with unilateral transtibial amputation (TTA) using total-contact patellar-tendon-bearing prostheses. Maximal interface stresses during stance phase for each of 13 transducer sites were determined, then means for all steps calculated. Maximal pressure and resultant shear stress during stance phase were shown at anterior distal or mid-limb sites and the maxima occurred during the first 50% of stance phase. Anterior medial and lateral proximal sites showed their greatest pressure during the second 50%. At lateral mid-limb and popliteal fossa sites, resultant shear stress directions suggest that soft tissue was displaced toward the socket brim during weight-bearing. Results also suggest that skin across the distal tibial crest was in tension at the times of the first and second peaks in the shank axial force-time curve in all sessions. Significant difference (p < 0.05) in maximal stresses between sessions conducted > 3 weeks apart were apparent for both subjects.
使用全接触髌腱承重假肢，在两名单侧经胫骨截肢（TTA）患者的13个部位测量了残肢/假肢接受腔界面压力和剪切应力。确定了13个换能器部位中每个部位在站立期的最大界面应力，然后计算所有步幅的平均值。站立期的最大压力和合成剪切应力出现在前远端或肢体中部位置，最大值出现在站立期的前50%。前内侧和外侧近端部位在第二个50%期间显示出最大压力。在外侧肢体中部和腘窝部位，合成剪切应力方向表明，负重时软组织向接受腔边缘移位。结果还表明，在所有测试中，小腿轴向力-时间曲线的第一和第二个峰值出现时，胫骨嵴远端的皮肤处于拉伸状态。两名受试者在间隔超过3周进行的测试之间，最大应力存在显著差异（p < 0.05）。
