Polyethylene wear and synovitis in total hip arthroplasty: a sonographic study of 48 hips

Research output: Contribution to journalArticle


Forty-six patients (48 hips), operated on with cemented total hip arthroplasty (THA) because of arthrosis, were examined radiographically and sonographically at 10-year follow-up. Polyethylene wear of acetabular cups was measured on conventional non-weight-bearing pelvic radiographs, and the volume of polyethylene debris was calculated. Radiographic signs of loosening were identified. The capsular distance (ie, thickness of the synovium or synovial contents) was measured sonographically. We found a significant correlation between increased volumetric wear and increased capsular distance. Hips with radiographically loose acetabular components had significantly greater volumetric wear and capsular distance than those without signs of acetabular loosening. This relationship was not observed in hips with radiographically loose femoral components. In cemented THA, the volume of polyethylene wear debris and the thickness of the synovium and the synovial contents are related. In the event of radiographic loosening of the acetabular component, they are both increased.


Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Orthopedics


  • total hip arthroplasty, sonography of the hip, polyethylene wear, synovitis
Original languageEnglish
Pages (from-to)138-143
JournalJournal of Arthroplasty
Issue number2
Publication statusPublished - 1999
Publication categoryResearch