title: Wrist rhythm during wrist joint motion evaluated by dynamic radiography.
abstract: We hypothesized that wrist joint motion involves a "wrist rhythm" similar to the scapulohumeral rhythm. Therefore, we used a flat-panel detector to evaluate the ratio of radiolunate and capitolunate joint motions during wrist joint motion by dynamic radiography. The subjects were 20 healthy men. Dynamic imaging of the wrist joint was performed during active exercise for a total of ten seconds. In this study, we defined the radiocarpal (RL angle) and midcarpal joint angle (CL angle) as the wrist joint angle in the obtained images and measured the variation of these angles. The average curve was plotted and regression lines calculated from the average curve. The ratio was calculated from the slopes of the regression lines of the RL CL angles. These findings indicated that the ratio of the RL and CL angle motions was approximately 1:4 during palmar flexion and approximately 2:1 during dorsiflexion.
authors.affiliation: Radiology Division, Kanazawa University Hospital, Division of Health Sciences, Graduate School of Medical Science, Kanazawa University, Kanazawa, Japan.
authors.forename: Hiroki
authors.initials: H
authors.lastname: Kawashima
authors.forename: Kaoru
authors.initials: K
authors.lastname: Tada
authors.forename: Seigo
authors.initials: S
authors.lastname: Suganuma
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Tsuchiya
authors.forename: Shigeru
authors.initials: S
authors.lastname: Sanada
mesh_terms: D000328:Adult; D050824:Carpal Joints / Q000000981:diagnostic imaging* / Q000502:physiology*; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008297:Male; D009068:Movement / Q000502:physiology; D011859:Radiography; D016059:Range of Motion, Articular / Q000502:physiology*; D012016:Reference Values; D014955:Wrist Joint / Q000000981:diagnostic imaging* / Q000502:physiology*; D055815:Young Adult
keywords: Dynamic Radiography; Midcarpal Joint; Radiocarpal Joint; Wrist Rhythm