Print Email Facebook Twitter Fatigue-free operation of most body-powered prostheses not feasible for majority of users with trans-radial deficiency Title Fatigue-free operation of most body-powered prostheses not feasible for majority of users with trans-radial deficiency Author Hichert, M. (TU Delft Biomechatronics & Human-Machine Control) Vardy, A.N. (TU Delft Biomechatronics & Human-Machine Control) Plettenburg, D.H. (TU Delft Biomechatronics & Human-Machine Control) Date 2018 Abstract Background: Body-powered prostheses require cable operation forces between 33 and 131 N. The accepted upper limit for fatigue-free long-duration operation is 20% of a users’ maximum cable operation force. However, no information is available on users’ maximum force. Objectives: To quantify users’ maximum cable operation force and to relate this to the fatigue-free force range for the use of body-powered prostheses. Study design: Experimental trial. Methods: In total, 23 subjects with trans-radial deficiencies used a bypass prosthesis to exert maximum cable force three times during 3 s and reported discomfort or pain on a body map. Additionally, subjects’ anthropometric measures were taken to relate to maximum force. Results: Subjects generated forces ranging from 87 to 538 N. Of the 23 subjects, 12 generated insufficient maximum cable force to operate 8 of the 10 body-powered prostheses fatigue free. Discomfort or pain did not correlate with the magnitude of maximum force achieved by the subjects. Nine subjects indicated discomfort or pain. No relationships between anthropometry and maximal forces were found except for maximum cable forces and the affected upper-arm circumference for females. Conclusion: For a majority of subjects, the maximal cable force was lower than acceptable for fatigue-free prosthesis use. Discomfort or pain occurred in ~40% of the subjects, suggesting a suboptimal force transmission mechanism. Clinical relevance: The physical strength of users determines whether a body-powered prosthesis is suitable for comfortable, fatigue-free long-duration use on a daily basis. High cable operation forces can provoke discomfort and pain for some users, mainly in the armpit. Prediction of the users’ strength by anthropometric measures might assist the choice of a suitable prosthesis. Subject body-powered prosthesiscable operation forceUpper-limb prosthetics To reference this document use: http://resolver.tudelft.nl/uuid:cb02af7f-dbac-4a3c-8140-ad979764bab6 DOI https://doi.org/10.1177/0309364617708651 ISSN 0309-3646 Source Prosthetics and Orthotics International, 42 (1), 84-92 Part of collection Institutional Repository Document type journal article Rights © 2018 M. Hichert, A.N. Vardy, D.H. Plettenburg Files PDF 0309364617708651.pdf 656.92 KB Close viewer /islandora/object/uuid:cb02af7f-dbac-4a3c-8140-ad979764bab6/datastream/OBJ/view