Dislocation after polyethylene liner exchange in total hip arthroplasty.

Area of Science:

• Orthopedic surgery
• Biomaterials science
• Clinical outcomes research

Background:

• Wear and osteolysis are common complications following total hip arthroplasty (THA).
• Polyethylene liner exchange is a surgical option to address these issues while preserving existing components.
• Limited data exists on the long-term outcomes and complications of isolated polyethylene liner exchange.

Purpose of the Study:

• To evaluate the clinical outcomes of isolated polyethylene liner exchange for wear or osteolysis.
• To assess the incidence of dislocation and functional recovery after polyethylene liner exchange.
• To identify potential risks and benefits associated with this procedure.

Main Methods:

• Retrospective review of 24 patients undergoing isolated polyethylene liner exchange.
• Assessment of dislocation events, including recurrent dislocations and need for revision surgery.
• Patient-reported outcomes via questionnaire regarding hip stability, function, and recovery time compared to primary THA.

Main Results:

• A significant complication rate of 25% (6 out of 24 hips) experienced dislocation post-exchange.
• Two patients required repeat surgery due to recurrent dislocations.
• While 13 patients reported faster recovery than primary arthroplasty, 4 noted decreased stability and 4 perceived poorer function; one revision for cup loosening occurred.

Conclusions:

• Isolated polyethylene liner exchange for wear or osteolysis is associated with a high risk of dislocation.
• The procedure may lead to a decrease in hip function and stability in a notable proportion of patients.
• Further research is warranted to optimize surgical techniques and patient selection for polyethylene liner exchange.