CORR Insights^®: Restoration of the Hip Center During THA Performed for Protrusio Acetabuli Is Associated With Better Implant Survival

Excerpt

Total hip arthroplasty (THA) has evolved to a predictable procedure for the majority of patients with good to excellent results during long followup periods. We are now at the stage of refining our data and fine tuning THA with the goal of achieving excellent results in those patients who did not do well during followup. The authors note that protrusio acetabuli, which they define well in their paper, is an uncommon condition; they identified only 162 hips with this problem from the massive Mayo Clinic joint registry. The figure in their paper shows how subtle the protrusio may become. The authors analyzed the data to determine if restoring the hip center to the native hip center of rotation, as defined by Ranawat, would decrease the occurrence of aseptic loosening of the prosthetic cup. …