Approach for Non-Intrusive Detection of the Fit of Orthopaedic Devices Based on Vibrational Data

Abstract

The soft tissues of residual limb amputees are subject to large volume fluctuations over the course of a day. Volume fluctuations in residual limbs can lead to local pressure marks, causing discomfort, pain and rejection of prostheses. Existing methods for measuring interface stress encounter several limitations. A major problem is that the measurement instrumentation is applied in the sensitive interface between the prosthesis and residual limb. This paper presents the principle investigation of a non-intrusive technique to evaluate the fit of orthopaedic prosthesis sockets in transfemoral amputees based on experimentally obtained vibrational data. The proposed approach is based on changes in the dynamical behaviour detectable at the outer surface of prostheses; thus, the described interface is not affected. Based on the experimental investigations shown and the derived results, it can be concluded that structural dynamic measurements are a promising non-intrusive technique to evaluate the fit of orthopaedic prosthesis sockets in transfemoral amputee patients. The obtained resonance frequency changes of 2% are a good indicator of successful applicabilityas these changes can be detected without the need for complex measurement devices.

Recent Advances in Biomimetics for the Development of Bio-Inspired Prosthetic Limbs

“…This section explores the latest innovations in materials and manufacturing techniques, elucidating their impact on prosthetic design and functionality. A pivotal advancement in prosthetic fabrication involves the creation of anatomically-shaped sockets, crucial interfaces between the residual limb and the prosthetic device [47]. Leveraging 3D scanning technologies and computational modeling, prosthetists can craft custom-fit sockets that intricately match the contours of the user's residual limb [48].…”