Mechanical Properties,Oxidation, and Clinical Performance of Retrieved Highly Cross-Linked Crossfire Liners After Intermediate-Term Implantation |
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Authors: | Steven M. Kurtz Matthew S. Austin Khalid Azzam Peter F. Sharkey Daniel W. MacDonald Francisco J. Medel William J. Hozack |
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Affiliation: | ? Implant Research Center, School of Biomedical Engineering, Science, and Health, Systems, Drexel University, Philadelphia, Pennsylvania;† Exponent, Inc., Philadelphia, Pennsylvania;‡ Rothman Institute, Philadelphia, Pennsylvania |
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Abstract: | Sixty Crossfire (Stryker Orthopaedics, Mahwah, NJ) liners were consecutively revised after an average of 2.9 years (range, 0.01-8.0 years) for reasons unrelated to wear or mechanical performance of the polyethylene. Femoral head penetration was measured directly from 42 retrievals implanted for more than 1 year. Penetration rate results (0.04 mm/y, on average; range, 0.00-0.13 mm/y) confirmed decreasing wear rates with longer in vivo times. Overall, we observed oxidation levels at the bearing surface of the 60 liners (0.5, on average; range, 0.1-1.7) comparable to those of nonimplanted liners (0.5, on average; range, 0.3-1.1) and preservation of mechanical properties. We also measured elevated oxidation of the rim (3.4, on average; range, 0.2-8.8) that was correlated with implantation time. Rim surface damage, however, was observed in only 3 (5%) of 60 cases. Retrieval analysis of the 3 rim-damaged liners did not reveal an association between surface damage and the reasons for revision. |
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Keywords: | mechanical properties oxidation wear hip arthroplasty highly cross-linked ultra&ndash high molecular weight polyethylene |
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