title: Ulnocarpal impaction syndrome restricts even midcarpal range of motion.
abstract: Ulnocarpal impaction syndrome is believed to be caused by abutment between the ulna and the ulnar carpus. We measured radiocarpal and midcarpal ranges of motion in 40 patients with ulnocarpal impaction syndrome by radiographic motion studies. The results showed that the radiocarpal and midcarpal ranges of motion were equally restricted in the affected wrist compared with the unaffected wrist. Therefore, motion of the radiocarpal joint and midcarpal joint contributed equally to total wrist motion bilaterally. No correlation between ulnar variance and the contribution of radiocarpal motion to overall wrist motion was found. Restriction of wrist motion in ulnocarpal impaction syndrome is not caused directly by abutment between the ulna and ulnar carpus, but a satisfactory explanation for restricted motion is still lacking.
authors.affiliation: Department of Hand Surgery, Nagoya University School of Medicine, Nagoya, Japan. tatebe@med.nagoya-u.ac.jp
authors.forename: Masahiro
authors.initials: M
authors.lastname: Tatebe
authors.forename: Ryogo
authors.initials: R
authors.lastname: Nakamura
authors.forename: Emiko
authors.initials: E
authors.lastname: Horii
authors.forename: Etsuhiro
authors.initials: E
authors.lastname: Nakao
authors.forename: Hironobu
authors.initials: H
authors.lastname: Inagaki
mesh_terms: D000328:Adult; D005260:Female; D018737:Hand Strength / Q000502:physiology; D006801:Humans; D007592:Joint Diseases / Q000000981:diagnostic imaging / Q000503:physiopathology*; D008297:Male; D011859:Radiography; D016059:Range of Motion, Articular / Q000502:physiology*; D013577:Syndrome; D014457:Ulna / Q000000981:diagnostic imaging / Q000503:physiopathology*; D014955:Wrist Joint / Q000000981:diagnostic imaging / Q000503:physiopathology*