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Study: Functional outcome after THA is independent of acetabular component orientation
When it comes to maximizing patient-perceived outcomes after total hip arthroplasty using a polyethylene liner with a metal or ceramic femoral head, accurate cup orientation may not be critical if the combined anteversion is within a normal range and the hip joint is properly balanced, according to results.
Researchers prospectively monitored 477 total hip arthroplasties (THAs) with a polyethylene liner during an average of 4.7 years follow-up. Researchers measured cup position on pelvis radiographs and patients completed the WOMAC index and SF-12 Health Survey questionnaires.
Results showed significant improvements from baseline in the WOMAC pain, function and stiffness, and the SF-12 Physical and Mental Component subscale scores. Researchers noted an average abduction of 43.1° and an average anteversion of 13.3° in the 477 acetabular cups. According to results, 62.9% of the acetabular cups had both inclination and version angles positioned within the Lewinnek safe zone vs. 37.1% of acetabular cups outside the Lewinnek safe zone. However, multivariate analysis showed cup positioning within the Lewinnek safe zone was not a statistically significant predictor of improved outcomes for WOMAC pain, stiffness and function, and SF-12 Physical Component and Mental Component subscale scores. – by Casey Tingle
Disclosures: Bobman reports no relevant financial disclosures. Please see the full study for a list of all other authors’ relevant financial disclosures.