Recurrent and non-recurrent dislocation following total hip arthroplasty

Area of Science:

• Orthopedic Surgery
• Arthroplasty Research
• Hip Biomechanics

Background:

• Total hip arthroplasty (THA) is a common procedure to address hip joint degeneration.
• Post-operative dislocation remains a significant complication following THA.
• Identifying risk factors for dislocation is crucial for improving patient outcomes.

Purpose of the Study:

• To determine the incidence of post-operative dislocation after primary total hip arthroplasty.
• To investigate potential technical and patient-related risk factors for hip dislocation.
• To differentiate between primary and recurrent dislocation events.

Main Methods:

• Retrospective analysis of 1739 primary total hip arthroplasty cases.
• Evaluation of surgical technique parameters, including socket position and limb length.
• Comparison of dislocation rates based on patient history, including prior osteotomy and hip fractures.

Main Results:

• The overall rate of post-operative dislocation was 3.3%, with 0.9% classified as recurrent.
• No single technical factor, such as socket malposition or limb shortening, was identified as a cause.
• Previous osteotomy predisposed to dislocation, but not recurrent cases. Prior cervical-femoral fractures showed significantly higher dislocation rates compared to coxarthrosis.
• Higher dislocation rates in men with alcoholism and women of advanced age were noted.

Conclusions:

• Surgical technique factors were not primary drivers of post-operative hip dislocation in this cohort.
• Patient-specific factors, including a history of hip fracture and demographic characteristics, are significant risk factors.
• Further investigation into patient-related factors like alcoholism and age is warranted to mitigate dislocation risk.