Radiostereometric Analysis Comparison of Wear of Highly Cross-Linked Polyethylene Against 36- vs 28-mm Femoral Heads
Section snippets
Methods
Institutional review board approval was obtained for this nonconsecutive, nonrandomized clinical study. Thirty patients in need of primary THA were enrolled in this RSA hip study in which all patients received e-beam–irradiated and subsequently melted, highly cross-liked polyethylene. Sixteen patients received cementless Trilogy Acetabular components (Zimmer Inc, Warsaw, Ind) with 28-mm-diameter femoral heads, and 14 patients received the same type of components with a 36-mm femoral head
Results
The initial group of patients enrolled in the study consisted of 19 men and 11 women with an average of 56.1 (range, 36-77) years of age at surgery. The most common primary diagnosis was osteoarthritis (12 patients). Additional primary diagnoses were developmental abnormalities (7 patients), avascular necrosis (4 patients), slipped capital femoral epiphysis (2 patients), and other (5 patients). Since surgery, 4 patients refused follow-up for the study, and 1 hip was revised because of recurrent
Conclusion
Regardless of analysis method, no significant measurable wear of the highly cross-linked polyethylene was detected in either group. The 3 analysis methods were found to yield comparable femoral head penetration results. The results obtained using the marker-free version of the RSA software from the same set of radiographs show good agreement with the standard RSA method and shell + marker RSA method, which use tantalum beads attached to the implants. This method allows inclusion of images in
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Benefits or funds were received in partial or total support of the research material described in this article from Zimmer Inc (Warsaw, Ind).