{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,16]],"date-time":"2026-04-16T16:33:14Z","timestamp":1776357194826,"version":"3.51.2"},"reference-count":28,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2014,8,14]],"date-time":"2014-08-14T00:00:00Z","timestamp":1407974400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/3.0\/"}],"funder":[{"DOI":"10.13039\/501100001711","name":"Swiss National Science Foundation","doi-asserted-by":"publisher","award":["SNF20NAN1_123630"],"award-info":[{"award-number":["SNF20NAN1_123630"]}],"id":[{"id":"10.13039\/501100001711","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>Total knee arthroplasty is a widely performed surgical technique. Soft tissue force balancing during the operation relies strongly on the experience of the surgeon in equilibrating tension in the collateral ligaments. Little information on the forces in the implanted prosthesis is available during surgery and post-operative treatment. This paper presents the design, fabrication and testing of an instrumented insert performing force measurements in a knee prosthesis. The insert contains a closed structure composed of printed circuit boards and incorporates a microfabricated polyimide thin-film piezoresistive strain sensor for each condylar compartment. The sensor is tested in a mechanical knee simulator that mimics in-vivo conditions. For characterization purposes, static and dynamic load patterns are applied to the instrumented insert. Results show that the sensors are able to measure forces up to 1.5 times body weight with a sensitivity fitting the requirements for the proposed use. Dynamic testing of the insert shows a good tracking of slow and fast changing forces in the knee prosthesis by the sensors.<\/jats:p>","DOI":"10.3390\/s140815009","type":"journal-article","created":{"date-parts":[[2014,8,14]],"date-time":"2014-08-14T10:37:25Z","timestamp":1408012645000},"page":"15009-15021","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":20,"title":["Enclosed Electronic System for Force Measurements in  Knee Implants"],"prefix":"10.3390","volume":"14","author":[{"given":"David","family":"Forchelet","sequence":"first","affiliation":[{"name":"Microsystems Laboratory (LMIS4), \u00c9cole Polytechnique F\u00e9d\u00e9rale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland"}]},{"given":"Matteo","family":"Simoncini","sequence":"additional","affiliation":[{"name":"Laboratory of Microengineering for Manufacturing (LPM), \u00c9cole Polytechnique F\u00e9d\u00e9rale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland"}]},{"given":"Arash","family":"Arami","sequence":"additional","affiliation":[{"name":"Laboratory of Movement Analysis and Measurement (LMAM), \u00c9cole Polytechnique F\u00e9d\u00e9rale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland"}]},{"given":"Arnaud","family":"Bertsch","sequence":"additional","affiliation":[{"name":"Microsystems Laboratory (LMIS4), \u00c9cole Polytechnique F\u00e9d\u00e9rale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland"}]},{"given":"Eric","family":"Meurville","sequence":"additional","affiliation":[{"name":"Laboratory of Microengineering for Manufacturing (LPM), \u00c9cole Polytechnique F\u00e9d\u00e9rale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland"}]},{"given":"Kamiar","family":"Aminian","sequence":"additional","affiliation":[{"name":"Laboratory of Movement Analysis and Measurement (LMAM), \u00c9cole Polytechnique F\u00e9d\u00e9rale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland"}]},{"given":"Peter","family":"Ryser","sequence":"additional","affiliation":[{"name":"Laboratory of Microengineering for Manufacturing (LPM), \u00c9cole Polytechnique F\u00e9d\u00e9rale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland"}]},{"given":"Philippe","family":"Renaud","sequence":"additional","affiliation":[{"name":"Microsystems Laboratory (LMIS4), \u00c9cole Polytechnique F\u00e9d\u00e9rale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland"}]}],"member":"1968","published-online":{"date-parts":[[2014,8,14]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"91","DOI":"10.1136\/ard.60.2.91","article-title":"Knee pain and osteoarthritis in older adults: A review of community burden and current use of primary health care","volume":"60","author":"Peat","year":"2001","journal-title":"Ann. 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