Sanders Joan E, Redd Christian B, Cagle John C, Hafner Brian J, Gardner David, Allyn Katheryn J, Harrison Daniel S, Ciol Marcia A
Department of Bioengineering, University of Washington, Seattle, WA.
J Rehabil Res Dev. 2016;53(6):1107-1120. doi: 10.1682/JRRD.2014.12.0316.
For people who wear a prosthetic limb, residual-limb fluid volume loss during the day may be problematic and detrimentally affect socket fit. The purpose of this research was to test the capability of a novel liner with adjustable bladders positioned within its wall to mitigate volume loss and facilitate limb fluid volume recovery and retention. Bioimpedance analysis was used to monitor fluid volume changes in the anterior and posterior residual limb of participants with transtibial amputation. Participants underwent six cycles of sitting for 90 s, standing for 90 s, and walking for 5 min with liquid within the bladder-liners. Between the third and fourth cycles, participants sat for 10 min with liquid left within the bladders (Liquid-In) or removed (Liquid-Out). Results showed that participants recovered more fluid volume during the 10 min of sitting with Liquid-Out than Liquid-In (p = 0.09 for anterior and p = 0.04 for posterior). However, those fluid volume recoveries were not well retained in the short term (after the fourth cycle) or the long term (after the sixth cycle). Physiologic differences between sessions, reflected in the rates of fluid volume change at the outset of the session, and excessive stiffness of the bladder-liners may have affected fluid volume retentions.
对于佩戴假肢的人来说，白天残肢液体量的减少可能会带来问题，并对接受腔的贴合产生不利影响。本研究的目的是测试一种新型衬垫的性能，该衬垫内壁设有可调节气囊，以减轻液体量的减少，并促进肢体液体量的恢复和保持。采用生物电阻抗分析来监测经胫截肢参与者残肢前后部的液体量变化。参与者在气囊衬垫内装有液体的情况下，经历了六个周期，每个周期包括90秒的坐姿、90秒的站姿和5分钟的行走。在第三个和第四个周期之间，参与者坐着10分钟，气囊内保留液体（液体留存）或排空液体（液体排出）。结果显示，与液体留存相比，参与者在液体排出的10分钟坐姿期间恢复了更多的液体量（前部p = 0.09，后部p = 0.04）。然而，这些液体量的恢复在短期内（第四个周期后）或长期内（第六个周期后）并未得到很好的保持。各阶段之间的生理差异，反映在阶段开始时液体量变化的速率上，以及气囊衬垫的过度僵硬可能影响了液体量的保持。
