Functional shoulder radiography with use of a dynamic flat panel detector

• Published in: Radiological physics and technology Vol. 7; no. 2; pp. 254 - 261
• Main Authors: Sakuda, Keita, Sanada, Shigeru, Tanaka, Rie, Kitaoka, Katsuhiko, Hayashi, Norio, Matsuura, Yukihiro
• Format: Journal Article
• Language: English
• Published: Tokyo Springer Japan 01.07.2014
• Subjects: Adolescent; Adult; Female; Humans; Imaging; Male; Medical and Radiation Physics; Medicine; Medicine & Public Health; Nuclear Medicine; Paralysis - diagnostic imaging; Radiation Dosage; Radiography - instrumentation; Radiology; Radiotherapy; Recurrence; Shoulder Dislocation - diagnostic imaging; Shoulder Joint - diagnostic imaging; Shoulder Joint - injuries; Shoulder Joint - innervation; Thoracic Nerves - diagnostic imaging; Thoracic Outlet Syndrome - diagnostic imaging; Young Adult; Shoulder joint; Ratio of G-angle to S-angle (GSR); Scapulothoracic angle; Scapulohumeral rhythm; Dynamic flat panel detector
• ISSN: 1865-0333; 1865-0341; 1865-0341
• DOI: 10.1007/s12194-014-0257-2

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.