The Black Knee: A Rare Case of Knee Ochronotic Arthopaty in an Elderly Patient with Unknown Alkaptonuria

¹Department of UOC Orthopedics and Traumatology, Garbagnate Milanese Hospital, Milan, Italy

²Department of Orthopedics and Traumatology, University of Milano, Bicocca, Milan, Italy

³Department of Orthopedics and Traumatology, Cernusco S/N Hospital, Milan, Italy

⁴Department of Pathology, University of Milano, Bicocca, Milan, Italy