Document Detail

Does acetabular inclination angle affect survivorship of alumina-ceramic articulations?
MedLine Citation:
PMID:  20963533     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: Reports in the literature have linked high acetabular inclination angles to increased wear of ceramic-on-ceramic bearings. However, many of these studies were only conducted in vitro and did not address the clinical relevance of such findings.
QUESTIONS/PURPOSES: We therefore determined: (1) whether the cup inclination angle influences survival or function in patients with ceramic-on-ceramic implants; (2) the incidence of radiolucencies, osteolysis, and subsidence of ceramic-on-ceramic implants; and (3) whether the survival rate higher for ceramic-on-ceramic THAs than for conventional metal-on-polyethylene THAs.
METHODS: We retrospectively reviewed 537 THAs performed in 512 prospectively followed patients having THA between October 1996 and October 2000. Eleven patients (12 hips) were lost to followup before 2 years, leaving 501 patients (525 THAs); of these, 421 were alumina ceramic-on-ceramic articulations and 104 cobalt-chromium-on-polyethylene. The mean age was 54 years. We determined acetabular cup inclination angles, Harris hip scores, Health-Status-Questionnaire-12 scores, and presence and location of any radiolucencies, osteolysis, or radiographic subsidence. We compared survival using the Kaplan-Meier method. The minimum followup was 24 months (mean, 59 months; range, 24-120 months).
RESULTS: Twenty-two of the 424 THAs (4.2%) were revised. We observed no difference in clinical or radiographic outcomes with respect to cup inclination angles. Radiographically, two loose acetabular components and two femoral components had subsided. The 5-year survival rate was slightly higher for ceramic-on-ceramic bearings (98%) than for metal-on-polyethylene (92%).
CONCLUSIONS: Although there may be a link between acetabular inclination angles and wear rates as reported by some authors, we found no differences in patient function or radiographic survivorship using alumina-on-alumina articulations.
Henning R Johansson; Aaron J Johnson; Michael G Zywiel; Marybeth Naughton; Michael A Mont; Peter M Bonutti
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Publication Detail:
Type:  Comparative Study; Journal Article; Randomized Controlled Trial    
Journal Detail:
Title:  Clinical orthopaedics and related research     Volume:  469     ISSN:  1528-1132     ISO Abbreviation:  Clin. Orthop. Relat. Res.     Publication Date:  2011 Jun 
Date Detail:
Created Date:  2011-05-16     Completed Date:  2011-07-21     Revised Date:  2013-07-03    
Medline Journal Info:
Nlm Unique ID:  0075674     Medline TA:  Clin Orthop Relat Res     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1560-6     Citation Subset:  AIM; IM    
Department of Orthopedic Surgery, University Hospital Rostock, Rostock, Germany.
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MeSH Terms
Acetabulum / surgery*
Aluminum Oxide*
Arthroplasty, Replacement, Hip / methods*
Follow-Up Studies
Hip Prosthesis*
Materials Testing / methods*
Middle Aged
Prospective Studies
Prosthesis Design
Prosthesis Failure
Range of Motion, Articular*
Time Factors
Reg. No./Substance:
1344-28-1/Aluminum Oxide

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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