title: Functional shoulder radiography with use of a dynamic flat panel detector.
abstract: Our purpose in this study was to develop a functional form of radiography and to perform a quantitative analysis for the shoulder joint using a dynamic flat panel detector (FPD) system. We obtained dynamic images at a rate of 3.75 frames per second (fps) using an FPD system. Three patients and 5 healthy controls were studied with a clinically established frontal projection, with abduction of the arms. The arm angle, glenohumeral angle (G-angle), and scapulothoracic angle (S-angle) were measured on dynamic images. The ratio of the G-angle to the S-angle (GSR) was also evaluated quantitatively. In normal subjects, the G-angle and S-angle changed gradually along with the arm angle. The G-angle was approximately twice as large as the S-angle, resulting in a GSR of 2 throughout the abduction of the shoulder. Changes in G-angle and S-angle tended to be irregular in patients with shoulder disorders. The GSR of the thoracic outlet syndrome, recurrent dislocation of the shoulder joint, and anterior serratus muscle paralysis were 3-7.5, 4-9.5, and 3.5-7.5, respectively. The GSR of the anterior serratus muscle paralysis improved to approximately 2 after orthopedic treatment. Our preliminary results indicated that functional radiography by FPD and computer-aided quantitative analysis is useful for diagnosis of some shoulder disorders, such as the thoracic outlet syndrome, recurrent dislocation of the shoulder joint, and anterior serratus muscle paralysis. The technique and procedures described comprise a simple, functional shoulder radiographic method for evaluation of the therapeutic effects of surgery and/or rehabilitation.
authors: Division of Health Sciences, Radiology, Graduate School of Medical Science, Kanazawa University, 5-11-80 Kodatsuno, Kanazawa, Ishikawa, 920-0942, Japan, sakuta@med.kanazawa-u.ac.jp.
authors: Keita
authors: K
authors: Sakuda
authors: Shigeru
authors: S
authors: Sanada
authors: Rie
authors: R
authors: Tanaka
authors: Katsuhiko
authors: K
authors: Kitaoka
authors: Norio
authors: N
authors: Hayashi
authors: Yukihiro
authors: Y
authors: Matsuura
mesh_terms: D000293:Adolescent; D000328:Adult; D005260:Female; D006801:Humans; D008297:Male; D010243:Paralysis / Q000000981:diagnostic imaging; D011829:Radiation Dosage; D011859:Radiography / Q000295:instrumentation*; D012008:Recurrence; D012783:Shoulder Dislocation / Q000000981:diagnostic imaging; D000070599:Shoulder Injuries; D012785:Shoulder Joint / Q000000981:diagnostic imaging* / Q000294:innervation; D013900:Thoracic Nerves / Q000000981:diagnostic imaging; D013901:Thoracic Outlet Syndrome / Q000000981:diagnostic imaging; D055815:Young Adult