Iliopsoas Irritation as Presentation of Head-Neck Corrosion After Total Hip Arthroplasty: A Case Series.

Corrosion of modular components at the femoral neck remains a complication of total hip arthroplasty (THA). The authors have found the iliopsoas sign (pain on resisted flexion of the hip) to be suggestive of femoral component corrosion. These cases represented 8 of 120 revision hip arthroplasties (7%) performed at the authors' institution. After the revisions, all iliopsoas tendonitis symptoms resolved. Based on the authors' experience and the recent literature, they recommend that the iliopsoas sign or presentation of a sterile iliopsoas abscess in a previously well-functioning THA be concern for corrosion of the femoral component of the total hip.