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Assessment of residual-limb volume change using bioimpedence

Joan E. Sanders, PhD, et al.

Figure. Electrode setup.

We investigated whether measuring residual-limb volume changes with bioimpedance measurements in lower-limb amputees was possible. Residual-limb volume changes can cause the socket to become loose, concentrate interface stress in soft tissues, produce excessive pressures, and block blood flow, which can all result in soft tissue injury. Four strip electrodes were positioned across the lower leg or residual limb; the outer pair applied current and the inner pair sensed voltage. We used a commercial bioimpedance analyzer to supply current at different frequencies. We then determined fluid resistance and from that limb fluid volume. Bioimpedance offers a potential advantage over most other volume assessment methods: it can be conducted while the residual limb is within the prosthetic socket, and it could potentially be a useful tool in prosthetics research and clinical practice.


Volume 44 Number 4 2007
Pages 525 — 536


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