• K Erraoui, K Nassar, and S Janani.
• Département de rhumatologie, CHU Ibn-Rochd, Casablanca, Maroc. Electronic address: erraoui.khaoula93@gmail.com.
• Rev Med Interne. 2022 Nov 1; 43 (11): 669-672.

IntroductionOchronosis, also known as alkaptonuria, is a rare autosomal recessive disease. It is caused by a lack of homogentisic acid oxidase, which causes homogentisic acid deposition in the tissues.Case ReportWe report a 69-year-old patient who presented with chronic mechanical low back and radicular pain. The clinical examination revealed lumbar lordosis loss, lumbar spinal stiffness, and knee joint limitations of range of motion. On an extra-articular level, the pavilions of the ears and the internal angles of the eyes had a bluish color. Extensive lumbar disc calcifications, vacuum discal phenomenon and osteophytic bridges were demonstrated on standard radiographs of the spine. Clinical and radiographic criteria were used to make the diagnosis of ochronosis.ConclusionAlkaptonuria is a degenerative arthropathy that leads to reduction of functional ability. The use of molecular analysis and genetic research is useful.Copyright © 2022 Société Nationale Française de Médecine Interne (SNFMI). Published by Elsevier Masson SAS. All rights reserved.

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