Black Femoral Head Due to Ochronotic Arthropathy: A Case Report

Background: Ochronotic arthropathy is a rare complication in patients with alkaptonuria (AKU) that occurs as a result of ochronotic pigment accumulation in the joints.   Case Report: This case report presents a 54-year-old patient with severe degenerative arthritis who underwent total hip arthroplasty on both sides within an interval of three years. The diagnosis was made by observation of a dark capsule and femoral head during the second surgery. The surgical treatments significantly reduced the pain and improved the range of motion (ROM).   Conclusion: Orthopedic surgeons must be vigilant about clinical manifestations of this rare condition, before and during the surgery. Arthroplasty is a favourable therapeutic option in patients suffering from ochronotic arthropathy.