Dislocation and its recurrence after revision total hip arthroplasty.

Area of Science:

• Orthopedic Surgery
• Arthroplasty Research
• Biomechanical Engineering

Background:

• Dislocation is a primary complication following revision total hip arthroplasty (THA).
• Identifying risk factors for dislocation and recurrence is crucial for improving patient outcomes.

Purpose of the Study:

• To investigate the independent risk factors associated with dislocation after revision THA.
• To identify predictors for recurrent dislocations in patients undergoing revision THA.

Main Methods:

• Retrospective review of 178 revision THAs in 162 patients (1998-2013).
• Mean patient age was 65.2 years; mean follow-up was 6.7 years.
• Multivariate logistic regression analysis was employed to determine risk factors.

Main Results:

• Dislocation occurred in 9.0% of hips (16/178) at a mean of 9.1 months post-revision.
• Independent risk factors for dislocation included advanced age (OR=2.94/10 years) and osteonecrosis of the femoral head (OR=7.71).
• Recurrent dislocations (50% of dislocations) were associated with later dislocations (≥4 months) and lower BMI.

Conclusions:

• Dislocation is a significant concern after revision THA, influenced by multiple factors.
• Awareness of these risk factors aids in surgical planning and patient counseling.
• Findings are specific to the posterolateral surgical approach.