The Journal of Bone and Joint Surgery (American). 2006;88:213-216.
doi:10.2106/JBJS.F.00585
© 2006 The Journal of Bone and Joint Surgery, Inc.
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Patellofemoral Replacement Polymer Stress During Daily Activities: A Finite Element Study

Edward A. Morra, MSME and A. Seth Greenwald, DPhil(Oxon)

Corresponding author:
A. Seth Greenwald, DPhil(Oxon)
Orthopaedic Research Laboratories, Lutheran Hospital, a Cleveland
Clinic Hospital, 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
 
Isolated, symptomatic patellofemoral arthritis, although uncommon, has been reported to affect 8% of women and 2% of men over the age of fifty-five years1. Both conservative and surgical nonarthroplasty interventions have been advocated; however, reports on such interventions have suggested limited success2. Patellofemoral joint replacement designs as an alternative solution are beginning to reemerge largely through an appreciation of design requirements and the importance of component placement, which have been major factors in earlier clinical disappointments3-6.

This study describes the influence that three different patellofemoral implant design geometries have on stresses that are associated with polymer abrasion and delamination and suggests their efficacy in clinical use. The designs included the LCS PFJ (low-contact stress patellofemoral joint; DePuy, a Johnson and Johnson Company, Warsaw, Indiana), Vanguard (Biomet, Warsaw, Indiana), and Scout (Waldemar Link, Hamburg, Germany). The former two designs are available for clinical use in the United States.


   Methods
 
. . . [Full Text of this Article]


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