Knee and Hip Joint Replacement Surgery in a Patient with Ochronotic Arthropathy: Surgical Tips.

Ochronosis or black joints disorder is a rare autosomal recessive disorder caused by deficiency of homogentisic acid oxidase. Orthopaedic manifestations are common and mostly involve spine and large joints such as knee and hip. Arthropathy is progressive and will eventually leads to arthroplasty. Not being familiar with this disorder might lead to devastating complications. We present a 57 year-old woman with Ochronosis who successfully underwent cemented cruciated substituted knee replacement and cementless hip replacement. Proper orthopaedic and anesthetic pre-operative preparation, soft tissue specially patella tendon management throughout operation and meticulous bleeding control during surgery are crucial. The results of the knee and the hip replacement surgery in this patient are satisfactory, after 24 months and 18 months follow-up, respectively. If Orthopaedic surgeons and anesthesiologists are well prepared, the outcome of joint replacement in Ochronosis patients will be as satisfactory as patients with primary osteoarthritis.