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Long-term results of Charnley low-friction arthroplasty of the hip

D M Dall1, I Learmonth, M Solomon

  • 1Orthopaedic Research Laboratory, University of Southern California, Los Angeles.

South African Journal of Surgery. Suid-Afrikaanse Tydskrif Vir Chirurgie
|December 1, 1992
PubMed

Insights

Long-term analysis of Charnley low-friction arthroplasties shows a 6.5% mechanical failure rate, excluding sepsis. This hip replacement surgery demonstrates promising long-term component survival.

Area of Science:

  • Orthopedic Surgery
  • Biomaterials Science

Background:

  • The Charnley low-friction arthroplasty is a widely used hip replacement prosthesis.
  • Assessing the long-term outcomes and failure rates of such implants is crucial for patient care and future design.

Purpose of the Study:

  • To evaluate the long-term clinical and radiological results of 488 Charnley low-friction arthroplasties.
  • To determine the mechanical failure rate and incidence of radiological loosening.

Main Methods:

  • Analysis of 488 Charnley low-friction arthroplasties performed by a single surgeon.
  • Radiological assessment using the CART nomenclature.
  • Kaplan-Meier survival analysis for component survival.

Main Results:

  • Excluding sepsis (1.4%), the mechanical failure rate requiring revision was 6.5%.
  • The incidence of radiological loosening was 4.7%.
  • Kaplan-Meier analysis predicts 88% mechanical component survival at 10-12 years.

Conclusions:

  • Charnley low-friction arthroplasty demonstrates a low rate of mechanical failure when sepsis is excluded.
  • The study indicates good long-term mechanical survival for these hip implants.
  • Radiological loosening is a notable factor in implant failure, necessitating continued monitoring.

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