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811 Charnley hips followed for 3-17 years
D M Dall1, I D Learmonth, M Solomon
1Department of Orthopedics, University of Cape Town.
Acta Orthopaedica Scandinavica
|June 1, 1993
Summary
This study analyzed 811 Charnley hip arthroplasties, finding an 89% mechanical survival rate over 10-12 years. While stems showed higher revision rates than sockets, overall hip replacement survival remained high.
Area of Science:
- Orthopedic Surgery
- Biomedical Engineering
- Materials Science
Background:
- Total hip arthroplasty (THA) is a common procedure for hip joint degeneration.
- Charnley arthroplasty is a widely used THA technique.
- Long-term survivorship data is crucial for assessing implant performance.
Purpose of the Study:
- To evaluate the 10-12 year mechanical survivorship of primary or conversion Charnley arthroplasties.
- To identify failure modes and radiographic signs associated with Charnley arthroplasty revision.
- To assess the long-term performance of Charnley stems and sockets.
Main Methods:
- Survivorship analysis of 811 primary or conversion Charnley arthroplasties.
- Radiographic evaluation (anterio-posterior) of 630 unrevised hips using the CART system.
- Assessment of cement-bone radiolucency and loosening.
Main Results:
- 89% probability of mechanical survival (excluding sepsis) at 10-12 years.
- 7% mechanical failure rate, with stems requiring revision more often than sockets.
- 50% of sockets and 18% of stems showed cement-bone radiolucency.
- 6% incidence of substantial loosening, with 94% survival probability at 10-12 years.
Conclusions:
- Charnley arthroplasty demonstrates good long-term mechanical survival.
- Radiographic findings like radiolucency and loosening are common but do not always correlate with early failure.
- Further investigation into stem design and fixation may improve long-term outcomes.