{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,16]],"date-time":"2026-07-16T14:17:58Z","timestamp":1784211478838,"version":"3.55.0"},"reference-count":20,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2012,6,13]],"date-time":"2012-06-13T00:00:00Z","timestamp":1339545600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Journal Orthopaedic Research"],"published-print":{"date-parts":[[2013,1]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>There continues to be some dissatisfaction with the function of total knee arthroplasties (TKA). \u201cMid\u2010range instability\u201d has been linked to multi\u2010radius femoral components allowing transient ligament slackness and instability during knee flexion. Single\u2010radius designs have been introduced to avoid this. We compared the kinematics and stability of eight natural knees versus multi\u2010radius and single\u2010radius TKAs in vitro. The loading conditions imposed across the range of active knee extension were anterior\u2013posterior drawer forces, internal\u2013external rotation torques, and varus\u2013valgus moments. Significant differences were not found between the biomechanical behavior of the two TKAs. Both were significantly different from the natural knee in allowing greater anterior drawer laxity near extension, probably caused by excision of the anterior cruciate ligament, but no difference occurred beyond 30\u00b0 flexion. No differences were found for any of the other degrees\u2010of\u2010freedom of movement. A geometric analysis suggested that the multi\u2010radius design may tense the MCL more than the single\u2010radius in mid\u2010flexion, contrary to expectation. These kinematic and stability tests did not find mid\u2010range instability of the knees, and so they could not demonstrate enhanced mid\u2010range stability of the single\u2010radius TKA over the older multi\u2010radius implant. This suggests that mid\u2010range instability may relate to unrecognized ligament laxity during surgery, rather than being inherent to a specific feature of implant design. \u00a9 2012 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. 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