title: Carpal instability in rheumatoid arthritis and calcium pyrophosphate deposition disease. Pathogenesis and roentgen appearance.
abstract: The roentgen appearance and pathogenesis of carpal instability are described in an evaluation of patients and cadavers with rheumatoid arthritis and calcium pyrophosphate deposition disease. Dorsiflexion (16%) and palmar flexion (8%) instability occurs in rheumatoid arthritis, particularly in patients with moderate to advanced disease. Navicular-lunate dissociation frequently accompanies dorsiflexion instability and results from involvement of the interosseous ligament between the two bones by rheumatoid pannus. Carpal instability and navicular-lunate dissociation also accompany pyrophosphate arthropathy, resulting from calcific deposition and cystic degeneration of ligamentous structures.
mesh_terms: D000328:Adult; D000368:Aged; D001172:Arthritis, Rheumatoid / Q000000981:diagnostic imaging* / Q000503:physiopathology; D002114:Calcinosis / Q000000981:diagnostic imaging*; D002131:Calcium Pyrophosphate; D002348:Carpal Bones / Q000000981:diagnostic imaging* / Q000503:physiopathology; D005260:Female; D006801:Humans; D007592:Joint Diseases / Q000000981:diagnostic imaging; D008297:Male; D008875:Middle Aged; D011859:Radiography
chemical_list: D002131:Calcium Pyrophosphate