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01.11.2009 | Original Article | Ausgabe 11/2009

Clinical Orthopaedics and Related Research® 11/2009

Acetabular Polyethylene Wear and Acetabular Inclination and Femoral Offset

Zeitschrift:
Clinical Orthopaedics and Related Research® > Ausgabe 11/2009
Autoren:
MSc, MRCS Nick J. Little, MD, FRCS Constant A. Busch, MD, FRACS John A. Gallagher, MD, FRCSC Cecil H. Rorabeck, MD, FRCSC Robert B. Bourne
Wichtige Hinweise
Each author certifies that he or she has no commercial associations (eg, consultancies, stock ownership, equity interest, patent/licensing arrangements, etc) that might pose a conflict of interest in connection with the submitted article.
Each author certifies that his or her institution has approved or waived approval for the human protocol for this investigation, that all investigations were conducted in conformity with ethical principles of research, and that informed consent for participation in the study was obtained.
This work was performed at University of Western Ontario.

Abstract

Restoration of femoral offset and acetabular inclination may have an effect on polyethylene (PE) wear in THA. We therefore assessed the effect of femoral offset and acetabular inclination (angle) on acetabular conventional (not highly cross-linked) PE wear in uncemented THA. We prospectively followed 43 uncemented THAs for a minimum of 49 months (mean, 64 months; range, 49–88 months). Radiographs were assessed for femoral offset, acetabular inclination, and conventional PE wear. The mean (± standard deviation) linear wear rate in all THAs was 0.14 mm/year (± 0.01 mm/year) and the mean volumetric wear rate was 53.1 mm3/year (± 5.5 mm3/year). In THAs with an acetabular angle less than 45°, the mean wear was 0.12 mm/year (± 0.01 mm/year) compared with 0.18 mm/year (± 0.02 mm/year) in those with a reconstructed acetabular angle greater than 45°. Reproduction of a reconstructed femoral offset to within 5 mm of the native femoral offset was associated with a reduction in conventional PE wear (0.12 mm/year versus 0.16 mm/year). Careful placement of the acetabular component to ensure an acetabular angle less than 45° in the reconstructed hip allows for reduced conventional PE wear.
Level of Evidence: Level II, prospective study. See Guidelines for Authors for a complete description of levels of evidence.

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