Ossifying tendinitis of the rotator cuff after arthroscopic excision of calcium deposits: report of two cases and literature review.

Ossifying tendinitis (OT) is a type of heterotopic ossification, characterized by deposition of hydroxyapatite crystals in a histologic pattern of mature lamellar bone. It is usually associated with surgical intervention or trauma and is more commonly seen in Achilles or distal biceps tendons, and also in the gluteus maximus tendon. To our knowledge, there is no description of OT as a complication of calcifying tendinitis of the rotator cuff.

Shoulder arthroplasty in alkaptonuric arthropathy: a clinical case report and literature review.

Alkaptonuria is a rare hereditary metabolic disease of autosomal recessive inheritance, resulting from deficiency of the enzyme homogentisic acid oxidase. The term "alkaptonuria" was first used in 1859 by Boedeker to describe a patient's urinary reducing compound, and in 1866, Virchow coined the term "ochronosis" due to typical yellow pigmentation. Deposition of this pigment in articular cartilage leads to ochronotic arthropathy, the most incapacitating complication of alkaptonuria.