title: [The dorsal metacarpal ligament I and arthrosis of the saddle joint of the thumb].
abstract: Morphology and function of the Ligamentum metacarpeum dorsale I are investigated. The ligament connects the capsule of the Articulatio carpometacarpea pollicis with the base of the second metacarpal bone. The ligament is responsible for the security and passive guidance of movements in the saddle joint of the thumb. In the course of an arthrotic affection of the Articulatio carpometacarpea pollicis the ligament is exposed to increased tensile stresses. The excessive mechanical stress often leads to partial ossification of the ligament. The ossification is radiologically identified as a spurlike protrusion at the base of the second metacarpal bone. The evaluation of clinical X-rays reveals, that an osseous spur can develop before the saddle joint of the thumb shows alterations. From this the bony spur is important for an early diagnosis of the rhizarthrosis.
mesh_terms: D000368:Aged; D005260:Female; D006225:Hand; D006801:Humans; D007592:Joint Diseases / Q000000981:diagnostic imaging* / Q000503:physiopathology; D008023:Ligaments, Articular / Q000033:anatomy & histology* / Q000502:physiology / Q000503:physiopathology; D008297:Male; D008875:Middle Aged; D009999:Ossification, Heterotopic / Q000000981:diagnostic imaging; D011859:Radiography; D013933:Thumb / Q000000981:diagnostic imaging*
vernacular_title: Das Ligamentum metacarpeum dorsale I und die Arthrose des Daumensattelgelenkes.