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The Journal of Bone and Joint Surgery (American) 85:111-114 (2003)
© 2003 The Journal of Bone and Joint Surgery, Inc.

Effects of Walking Gait on Ultra-High Molecular Weight Polyethylene Damage in Unicompartmental Knee Systems

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, Cleveland Clinic
Health System, 1730 West 25th Street, Cleveland, OH 44113. E-mail
address for A.S. Greenwald: seth@orl-inc.com

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

There is increasing, renewed interest in the use of unicompartmental knee replacement as the treatment of choice for isolated compartment disease, although there is debate regarding its role as a temporizing or definitive procedure. The popularization of mini-incision surgery with claims of reduced pain, shorter hospitalization, more rapid rehabilitation, more normal knee function, and decreased cost are positive arguments for the procedure. However, the damage observed in retrieved ultra-high molecular weight polyethylene components is the result of high cycle fatigue loads, which act on the polymer insert during daily walking. This suggests that there is a material limitation to the use of these components.

We used finite element analysis to examine the influence of four different modular unicompartmental knee design geometries on stresses associated with abrasion and delamination of the polymer insert. These designs include the Oxford Unicompartmental Phase-3 Mobile Bearing Knee (Biomet, Bridgend, South Wales, United Kingdom), Advance Unicompartmental . . . [Full Text of this Article]


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