Document Detail

Clinical and radiographic results of metal-on-metal hip resurfacing with a minimum ten-year follow-up.
MedLine Citation:
PMID:  21084576     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: There was a need for information about the long-term performance of the modern generation of hip resurfacing implants. A retrospective review of the first 100 hips that had implantation of one resurfacing design and had been followed for a minimum of ten years was performed.
METHODS: Between 1996 and 1998, 100 CONSERVE PLUS hip resurfacing devices were implanted by a single surgeon in eighty-nine patients. The mean age of the patients was 49.1 years, and fifty-nine patients were male. Primary osteoarthritis was the etiology for sixty-four hips. All patients were assessed clinically and radiographically.
RESULTS: The mean duration of follow-up was 11.7 years (range, 10.8 to 12.9 years). Two patients were lost to follow-up, and five patients died of causes unrelated to the surgery. Eleven hips had conversion to total hip arthroplasty because of loosening of the femoral component (eight), a femoral neck fracture (one), recurrent subluxation (one), and late infection (one). The Kaplan-Meier survivorship was 88.5% at ten years. None of the resurfacing arthroplasties failed in the twenty-eight hips that had a femoral component of >46 mm and no femoral head cystic or necrotic defects of >1 cm. Five hips had narrowing of the femoral neck, three had radiolucent zones interpreted as osteolysis, and twenty had signs of neck-socket impingement. Five hips had radiolucencies around the metaphyseal stem (two partial and three complete) that had been stable for 7.8 to 10.2 years. The mean scores on the University of California at Los Angeles (UCLA) system at the time of the latest follow-up were 9.5 points for pain, 9.3 points for walking, 8.9 points for function, and 6.8 points for activity; the mean scores on the physical and mental components of the Short Form-12 (SF-12) were 47.3 and 50.5 points, respectively; and the mean Harris hip score was 90 points.
CONCLUSIONS: The results of the present series constitute a reference point to which subsequent series should be compared. These ten-year results in a group of young patients are satisfactory, and the low rate of osteolysis is encouraging, but longer follow-up is required for comparison with conventional total hip arthroplasty.
Harlan C Amstutz; Michel J Le Duff; Patricia A Campbell; Thomas A Gruen; Lauren E Wisk
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Journal of bone and joint surgery. American volume     Volume:  92     ISSN:  1535-1386     ISO Abbreviation:  J Bone Joint Surg Am     Publication Date:  2010 Nov 
Date Detail:
Created Date:  2010-11-18     Completed Date:  2010-12-21     Revised Date:  2011-06-08    
Medline Journal Info:
Nlm Unique ID:  0014030     Medline TA:  J Bone Joint Surg Am     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2663-71     Citation Subset:  AIM; IM    
Joint Replacement Institute, Saint Vincent Medical Center, Los Angeles, CA 90057, USA.
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MeSH Terms
Arthroplasty, Replacement, Hip / adverse effects,  methods*
Cohort Studies
Femur Head / radiography,  surgery
Follow-Up Studies
Hip Joint / physiopathology,  radiography*,  surgery*
Hip Prosthesis*
Kaplan-Meier Estimate
Middle Aged
Multivariate Analysis
Orthopedic Procedures / adverse effects,  methods
Pain Measurement
Pain, Postoperative / physiopathology
Postoperative Complications / physiopathology,  radiography
Proportional Hazards Models
Prosthesis Design
Prosthesis Failure
Range of Motion, Articular / physiology
Retrospective Studies
Risk Assessment
Statistics, Nonparametric
Time Factors
Treatment Outcome
Young Adult
Reg. No./Substance:

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