Osteolysis in total hip arthroplasty after head and inlay revision surgery

Area of Science:

• Orthopedic Surgery
• Biomaterials Science
• Radiology

Background:

• Osteolysis, or bone loss, is a common complication following total hip arthroplasty (THA), often attributed to wear debris.
• Revision surgery involving the femoral head and acetabular liner is a potential treatment to address osteolysis.
• Identifying which patients benefit most from such interventions is crucial for optimizing outcomes.

Purpose of the Study:

• To evaluate the impact of head and acetabular liner revision surgery on osteolytic zones around the femoral component in THA.
• To determine if this revision surgery can reduce the size of these osteolytic areas.
• To identify patient characteristics that predict a positive response to revision surgery.

Main Methods:

• A retrospective review of 47 patients (51 hips) who underwent THA head and inlay revision surgery between 1999 and 2011.
• Analysis of pre-surgical and follow-up anterior-posterior X-rays to measure the size of radiolucent areas (osteolytic zones).
• Comparison of osteolytic zone sizes before and after revision surgery, with stratification based on initial size and implant materials.

Main Results:

• The mean size of radiolucent areas was 147 sq.mm pre-surgery and 145 sq.mm at a mean follow-up of 39.2 months.
• In cases with radiolucent zones exceeding 100 sq.mm, an average reduction of 28% was observed in 18 out of 29 instances.
• Overall improvement in osteolytic zones was noted in 29 out of 51 hips, with stabilization in one case.

Conclusions:

• Head and acetabular liner revision surgery can lead to a reduction in osteolytic zones around the femoral component in total hip arthroplasty.
• Patients presenting with larger initial radiolucent areas appear to benefit most from this revision procedure.
• This intervention may be a viable option for managing osteolysis in select THA patients.