Knee stability in meniscal bearing total knee arthroplasty |
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| Affiliation: | 1. Nepean Hospital, 2 Hope St, PO Box 949, Penrith, NSW 2750, Australia;2. Nepean Hospital, Derby St, Penrith, NSW 2750, Australia;3. Whitlam Orthopaedic Research Centre, Ingham Institute for Applied Medical Research, Australia;4. C/O Orthopaedic Department, Liverpool Hospital, Locked Bag 7103, Liverpool BC 1871, Sydney, NSW, Australia;5. Whitlam Orthopaedic Research Centre, Ingham Institute for Applied Medical Research, South Western Sydney Clinical School, UNSW Sydney, Australia;6. Sydney University, Nepean Hospital, Derby St, Penrith, NSW 2750, Australia;7. Nepean Hospital, 60A Derby St, Penrith, NSW 2750, Australia;1. Musculoskeletal Laboratory, Imperial College London, Charing Cross Hospital, London, United Kingdom;2. National Orthopaedic Centre of Excellence for Research and Learning (NOCERAL), Department of Orthopaedic Surgery, University of Malaya, Malaysia;3. Biomechanics Section, Mechanical Engineering Department, Imperial College London, United Kingdom;1. Department of Mechanical Engineering, University of Sheffield, United Kingdom;2. INSIGNEO Institute for in silico Medicine, University of Sheffield, United Kingdom;3. Medical Device Research Institute, College of Science and Engineering, Flinders University, Tonsley, SA, Australia;4. Centre for Orthopaedic and Trauma Research, The University of Adelaide, Adelaide, SA, Australia;5. Department of Orthopaedics and Trauma, Royal Adelaide Hospital, Adelaide, SA, Australia;6. School of Mechanical Engineering, University of Adelaide, Adelaide, SA 5005, Australia |
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| Abstract: | ![]()
The effect of a meniscal bearing on knee laxity in anterior cruciate ligament-sacrificing total knee arthroplasty was evaluated in 7 cadaver knees using a knee testing device that measured knee flexion angle as well as laxity to medial-lateral, anterior-posterior [AP], and rotational loads. A standard fixed tibial component and mobile tibial components (AP sliding, rotationally sliding, and AP and rotationally sliding) were used to evaluate AP, rotational, and varus-valgus stability and maximal flexion and extension with the neutrally positioned and malrotated tibial tray. The AP movable components increased AP laxity, and the fixed component decreased rotational laxity significantly when compared with the normal knees. The rotationally movable components did not change knee laxities significantly even when the tibial tray was malrotated. No significant difference among the components was detected when the maximal flexion and extension angles were compared in the neutrally positioned tibial tray. Malrotation of the tibial tray decreased the maximal extension angle in the fixed component. This study showed that the rotationally movable component can achieve near-normal laxity regardless of tibial tray rotation, but AP mobility of the bearing produces AP laxity that could lead to implant failure. |
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