Risk Stratification and Pain Outcomes Following Revision Total Hip Arthroplasty for Adverse Local Tissue Reactions

Area of Science:

• Orthopedic surgery
• Biomaterials science
• Patient outcomes research

Background:

• Revision total hip arthroplasty (THA) for adverse local tissue reactions (ALTRs) due to head-neck taper corrosion has a high complication rate.
• ALTR diagnosis relies on patient history, implant factors, metal ion levels, and imaging.
• This study investigates risk factor predictability for revision THA outcomes in metal-on-polyethylene (MoP) ALTR cases.

Purpose of the Study:

• To evaluate if established risk stratification factors predict outcomes in patients undergoing revision THA for MoP ALTR.
• To analyze pain relief and complication rates following revision THA for ALTR.

Main Methods:

• Retrospective review of 141 patients undergoing revision THA for ALTR caused by head-neck taper corrosion.
• Analysis of pain outcomes using a generalized linear mixed model.
• Complications defined as instability, dislocation, infection, fracture, nerve palsy, leg-length discrepancy, or reoperation.

Main Results:

• Overall complication rate was 17.7%.
• Significant pain reduction observed post-revision (OR=0.56).
• Decreased cobalt-chromium ratio correlated with increased postoperative complications (P=0.002).

Conclusions:

• Revision THA for ALTR in MoP implants provides substantial pain relief.
• Femoral head offset adjustments did not impact instability/dislocation rates.
• Risk stratification factors require further investigation for predicting complications in ALTR revision THA.