Published in:
01-02-2011 | Symposium: Papers Presented at the Hip Society Meetings 2010
Ceramic-on-Ceramic Total Hip Arthroplasty: Incidence of Instability and Noise
Authors:
David Schroder, MD, Lindsey Bornstein, BA, Mathias P. G. Bostrom, MD, Bryan J. Nestor, MD, Douglas E. Padgett, MD, Geoffrey H. Westrich, MD
Published in:
Clinical Orthopaedics and Related Research®
|
Issue 2/2011
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Abstract
Background
Alternative bearing materials in THA have been developed to reduce the incidence of osteolysis. Alumina-on-alumina bearings exhibit extremely low wear rates in vitro, but concerns exist regarding component impingement with the potential for dislocation and the occurrence of noise.
Questions/purposes
We determined generation of squeaking and the relationship between squeaking and component position.
Methods
We prospectively entered 436 alumina-on-alumina, cementless, primary THAs in 364 patients into our institutional database. All procedures were performed with the same surgical technique and the same implant. We obtained Harris Hip scores and a noise questionnaire and assessed radiographic component position and loosening. We determined the difference in abduction angle between squeakers and nonsqueakers. Minimum followup was 2 years (average, 3.5 years; range, 2.0–6.2 years).
Results
The mean Harris hip score increased from 51.9 preoperatively to 94.4 at latest followup. Six hips underwent reoperation: four hips (1.1%) for dislocation and two (0.53%) for periprosthetic fracture after trauma. The incidence of noise of any type was 11%, with the most common type of noise being clicking or snapping. Squeaking was reported by 1.9% of patients, with no patient being revised for this phenomenon. We found no association between component position and squeaking.
Conclusions
At average 3 years followup, 98% of ceramic-on-ceramic THAs did not require a revision, with 1.1% of hips having been revised for dislocation. Fewer than 2% of patients reported hearing an audible squeak, with no association found between component position and squeaking.
Level of Evidence
Level IV, therapeutic study. See Guidelines for Authors for a complete description of levels of evidence.