The Journal of Bone and Joint Surgery (American). 2005;87:120-124.
doi:10.2106/JBJS.E.00436
© 2005 The Journal of Bone and Joint Surgery, Inc.
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Polymer Insert Stress in Total Knee Designs During High-Flexion Activities: A Finite Element Study

Edward A. Morra, MSME and A. Seth Greenwald, DPHIL(OXON)

Corresponding author:
A. Seth Greenwald, D.Phil.(Oxon)
Orthopaedic Research Laboratories, Lutheran Hospital, Cleveland Clinic Health System, 1730 West 25th Street, Cleveland, OH 44113. E-mail address: seth@orl-inc.com

The first 150 words of the full text of this article appear below.


   Introduction
 
The success of total knee arthroplasty has contributed to its widening application to younger, more active patient populations whose daily regimen includes more demanding high-flexion activities. Worldwide expansion to patient populations in the Middle East and Asia, where the attainment of high degrees of knee joint flexion is often a cultural requirement, has been steadily increasing in recent years. The present study reveals the contact areas and stresses that are associated with polymer insert abrasion. Finite-element models were created of four total knee designs during the most highly loaded portions of three different high-flexion activities, and the results suggest their efficacy in clinical use.

Three mobile-bearing designs (including the Dual Bearing Knee [Finsbury Orthopaedics, Surrey, United Kingdom], e.motion [Aesculap, Tuttlingen, Germany], and P.F.C. Sigma RPF [DePuy, a Johnson and Johnson Company, Warsaw, Indiana] devices) and one fixed-bearing design (the Legacy LPS-Flex Fixed Bearing device [Zimmer, Warsaw, Indiana]) were evaluated. . . . [Full Text of this Article]


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