title: Relative articular inclination of the distal radioulnar joint: a radiographic study.
abstract: To determine the congruency of the distal radioulnar joint, 100 standardized normal wrist x-ray films were made and the following measurements taken: ulnar seat inclination, sigmoid notch inclination, and ulnar variance. The inclination angles were different in all but two cases. Relative to the long axis of the ulna, the sigmoid notch inclination averaged 7.7 degrees and the ulnar seat inclination averaged 21.0 degrees. There was a moderate correlation between the two inclination angles as well as between both sigmoid and ulnar seat inclination and ulnar variance. The data show that a wide variation between the inclination of the sigmoid notch and ulnar seat exists, which may explain why symptomatic articular incongruity can occur following ulnar shortening.
authors.affiliation: Hand Surgery Associates, Arlington Heights, IL 60005, USA.
authors.forename: S D
authors.initials: SD
authors.lastname: Sagerman
authors.forename: R G
authors.initials: RG
authors.lastname: Zogby
authors.forename: A K
authors.initials: AK
authors.lastname: Palmer
authors.forename: F W
authors.initials: FW
authors.lastname: Werner
authors.forename: M D
authors.initials: MD
authors.lastname: Fortino
mesh_terms: D000328:Adult; D006801:Humans; D011859:Radiography; D011884:Radius / Q000033:anatomy & histology / Q000000981:diagnostic imaging; D014457:Ulna / Q000033:anatomy & histology / Q000000981:diagnostic imaging / Q000601:surgery; D014955:Wrist Joint / Q000033:anatomy & histology / Q000000981:diagnostic imaging*