In vitro assessment of proximal polyethylene contact surface areas and stresses in mobile bearing knees
Wear of the polyethylene (PE) insert in total knee arthroplasty remains a significant problem. The generation of biologically active wear particles may ultimately affect implant longevity through osteolysis or premature/catastrophic PE failure. The rate and pattern of wear is influenced by many fact...
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Published in: | Medical engineering & physics 2003-07, Vol.25 (6), p.437-443 |
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Main Authors: | , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | Wear of the polyethylene (PE) insert in total knee arthroplasty remains a significant problem. The generation of biologically active wear particles may ultimately affect implant longevity through osteolysis or premature/catastrophic PE failure. The rate and pattern of wear is influenced by many factors, including component geometry and individual loading conditions, which determine the contact surface area and kinematics of the reconstructed knee. Contact areas and stresses at the proximal femoral–PE insert interface and distal PE–tibial interface contact surface areas were measured in nine mobile bearing total knee designs at 0, 30, 60, 90 and 110° of flexion at 3600 N (5×body weight) using a standardized test method. Proximal and, to a lesser degree, distal interface contact area footprints decreased significantly with increasing flexion angle based on the conformity of the designs, resulting in a corresponding increase in the mean and peak stresses. |
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ISSN: | 1350-4533 1873-4030 |
DOI: | 10.1016/S1350-4533(03)00016-X |