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The Journal of Bone and Joint Surgery (American) 83:S116-122 (2001)
© 2001 The Journal of Bone and Joint Surgery, Inc.

Scientific Article

Relationship Between Gravimetric Wear and Particle Generation in Hip Simulators: Conventional Compared with Cross-Linked Polyethylene

Michael D. Ries, MD, Marcus L. Scott, MS and Shilesh Jani, MS

Michael D. Ries, MD
Department of Orthopaedic Surgery, University of California, San Francisco, 500 Parnassus Avenue (MU-320-W), San Francisco, CA 94143. E-mail address: riesm{at}orthosurg.ucsf.edu

Marcus L. Scott, MS
Shilesh Jani, MS
Smith and Nephew Richards, Incorporated, 1450 Brooks Road, Memphis, TN 38116

In support of their research or preparation of this manuscript, one or more of the authors received grants or outside funding from Smith and Nephew Richards, Incorporated. In addition, one or more of the authors received payments or other benefits or a commitment or agreement to provide such benefits from a commercial entity (Smith and Nephew Richards, Incorporated). No commercial entity paid or directed, or agreed to pay or direct, any benefits to any research fund, foundation, educational institution, or other charitable or nonprofit organization with which the authors are affiliated or associated.

Summary

Hip-simulator studies have shown reduced gravimetric wear rates for inert-gas gamma-irradiated ultra-high molecular weight polyethylene when compared with conventional ethylene-oxide-sterilized ultra-high molecular weight polyethylene.

Analysis shows a greater number of particles generated from inert-gas gamma-irradiated ultra-high molecular weight polyethylene.

This study was undertaken to examine particle-generation rates of polyethylene with different levels of cross-linking and to correlate them with gravimetric wear data.

Particle-generation rates did not correlate with gravimetric wear rates. Particle analysis should be performed to predict the in vivo behavior of bearing surface materials.

Cross-linked ultra-high molecular weight polyethylene subjected to 10 Mrad (100,000 Gy) of gamma irradiation generated significantly fewer particles than ethylene-oxide-sterilized ultra-high molecular weight polyethylene; it also demonstrated a 96% reduction in the volume of particles.


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