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Long-term survival of the Charnley low-friction total hip arthroplasty
1Departments of Orthopaedic Surgery, Thomas Jefferson University, Philadelphia, 19107.
Insights
The Charnley low-friction total hip arthroplasty shows a 15-year failure probability for hip revision at 13%. This analysis indicates the Charnley hip arthroplasty has a limited lifespan, with significant loosening rates observed.
Area of Science:
- Orthopedic Surgery
- Biomedical Engineering
- Materials Science
Background:
- Total hip arthroplasty (THA) is a common procedure for hip joint diseases.
- The Charnley low-friction arthroplasty is a widely used implant design.
- Long-term survivorship data is crucial for evaluating implant performance.
Purpose of the Study:
- To evaluate the 15-year survivorship and failure modes of the Charnley low-friction total hip arthroplasty.
- To assess the long-term functional outcomes, specifically pain scores, following this arthroplasty.
- To determine the finite lifespan and identify common failure mechanisms of the Charnley implant.
Main Methods:
- Survivorship analysis of 1,151 primary Charnley low-friction total hip arthroplasties.
- Kaplan-Meier survival estimates were used to calculate failure probabilities.
- Pain scores were assessed over a 15-year follow-up period.
Main Results:
- 15-year failure probabilities: hip revision (13%), cup revision (8%), femoral revision (12%).
- Radiographic loosening rates: femoral loosening (13%), cup loosening (49%).
- At 15 years, 70% of patients reported a pain score less than 5.
Conclusions:
- The Charnley low-friction total hip arthroplasty demonstrates a finite lifespan.
- Radiographic cup loosening is a significant long-term concern.
- While pain improves, the implant's durability necessitates consideration of revision surgery over time.
Abstract:
A survivorship analysis of 1,151 Charnley low-friction total hip arthroplasties performed as a primary procedure showed the following 15-year failure probabilities: hip revision 13%, cup revision 8%, femoral revision 12%, radiographic femoral loosening 13%, and radiographic cup loosening 49%. Pain scores diminished gradually with time so that at 15 years, the probability of a Charnley pain score less than 5 was 70%. The data suggest that the Charnley low-friction hip arthroplasty has a finite life span.