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[Osteolysis after total knee prosthesis].

G Gacon1, M Philippe, L Barba

  • 1Clinique du Parc Lyon, 86 Boulevard des Belges, 69006 Lyon, France.

Revue De Chirurgie Orthopedique Et Reparatrice De L'Appareil Moteur
|February 12, 2000
PubMed
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Osteolysis after total knee arthroplasty (TKA) is less common in Europe than in the US. This study found a low incidence of osteolysis in 122 TKAs after an average of 6.9 years, suggesting improved prosthesis design may reduce this complication.

Area of Science:

  • Orthopedic Surgery
  • Biomaterials Science
  • Radiology

Background:

  • Osteolysis, a bone resorption complication, is frequently reported after total knee arthroplasty (TKA), particularly in the United States.
  • Understanding the incidence and causes of osteolysis is crucial for improving long-term TKA outcomes.

Purpose of the Study:

  • To investigate the occurrence of osteolysis in 122 TKAs after a minimum of 5 years post-implantation.
  • To assess the incidence of osteolysis and associated complications in a European cohort, comparing it to US findings.

Main Methods:

  • Retrospective analysis of 122 cementless posterior cruciate ligament-retaining TKAs implanted between 1985 and 1992.
  • Radiographic evaluation for osteolysis at an average follow-up of 6.9 years, alongside assessment for clinical complications and functional outcomes (Hungerford score).

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Main Results:

  • A low incidence of osteolysis was observed, with only 9 cases (7.3%) identified across both PCA and Themis prosthesis types.
  • Femoral osteolysis occurred in 3 PCA cases, tibial in 1 PCA and 3 Themis cases, and patellar in 1 case for each prosthesis type.
  • Clinical outcomes were generally good, with 19 revisions for various reasons, and 4 asymptomatic osteolytic lesions not requiring reoperation.

Conclusions:

  • Osteolysis after TKA appears to be less frequent in this European cohort compared to reported US data, potentially due to improved polyethylene quality and prosthesis design.
  • Factors contributing to higher osteolysis rates in the US may include dual-metal usage, poor polyethylene quality, or older prosthesis designs.
  • Continued advancements in biomaterials and prosthesis engineering are expected to further mitigate the long-term risk of osteolysis in total knee arthroplasty.