A rare case of sequential tendon rupture in a patient with alkaptonuria with ochronotic arthropathy of knee joint

Sequential rupture of tendon is a rare condition. We describe a case of 46-year-old male with previous history of bilateral tendo-Achilles tear presents with right side quadriceps tendon rupture. Alkaptonuria is a rare autosomal recessive disorder characterized by the absence of homogentisic acid oxidase enzyme. excessive accumulation of homogentisic acid causes Arthropathy and tendinopathy in musculoskeletal system and also affect multiple organ system.