Abstract:

First-generation once annealed highly crosslinked polyethylene (HXLPE) has perfomed well for over 10 years but the presence of free radicals remain a concern. A second-generation sequentially annealed HXLPE was developed to further reduce wear, maintain mechanical strength, and enhance oxidative resistance. The primary objective of this study was to determine if a second generation HXLPE has low linear wear at mean seven years follow-up without evidence of osteolysis or bearing surface failure. In a prospective study, 118 cases have five year and 43 cases have seven year data. The linear head penetration rate was measured at six weeks, yearly through five years, and at seven-plus years. Radiographic evaluation found linear wear of 0.015mm/yr at mean seven years. No osteolysis has been found and no revisions for bearing surface failure have occurred. This second-generation annealed highly crosslinked polyethylene has a low wear at seven years’ follow-up with no osteolysis or other bearing surface related complications.

Authors:

James A. D’Antonio, MD, Orthopaedic Surgeon, Greater Pittsburgh Orthopaedics Association, Moon Township, PA, William N. Capello, MD, Professor of Orthopaedics, Department of Orthopaedic Surgery, Indiana University School of Medicine, Indianapolis, IN, J. Wesley Mesko, MD, Orthopaedic Surgeon, Michigan Orthopedic Center, Lansing, MI, Rama Ramakrishnan, MS, Corporate Engineer, Stryker Orthopaedics, Mahwah, NJ

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