[Pseudotumor on metal debris after total hip arthroplasty].

Total hip arthroplasty (THA) is the standard treatment for osteoarthritis of the hip, aseptic osteonecrosis of the femoral head and specific hip fracture. Adverse tissue reactions to metal debris are feared in total hip replacements using the metal-on-metal bearing surfaces. They can result in local and systemic toxicity or local hypersensitivity to metal. Additional investigations, including blood tests, radiography and nuclear magnetic resonance imaging (RMN), are essential to establish the diagnosis. Surgical revision of the prosthesis or the friction torque could be necessary.