Yasushi Omori1, Nobuyuki Yamamoto2, Hayato Koishi1, Kazuma Futai1, Akira Goto3, Kazuomi Sugamoto1, Eiji Itoi4. 1. Department of Orthopaedic Biomaterial Science, Osaka University Graduate School of Medicine, Suita, Japan. 2. Department of Orthopaedic Surgery, Tohoku University School of Medicine, Sendai, Japan. 3. Department of Orthopaedic Surgery, Osaka University Graduate School of Medicine, Suita, Japan. 4. Department of Orthopaedic Surgery, Tohoku University School of Medicine, Sendai, Japan itoi-eiji@med.tohoku.ac.jp.
Abstract
BACKGROUND: A Hill-Sachs lesion is a common injury associated with anterior glenohumeral instability, and a Hill-Sachs lesion that engages with the anterior glenoid rim is 1 factor related to recurrent instability. In a cadaveric study in 2007, a new concept, the "glenoid track," was proposed to evaluate the risk of engagement of Hill-Sachs lesions with the glenoid. PURPOSE: To investigate the glenoid track in vivo using a custom-developed noninvasive motion analysis system. STUDY DESIGN: Descriptive laboratory study. METHODS: Using a wide-gantry magnetic resonance imaging (MRI) scanner, the right shoulders of 30 healthy volunteers were examined. The MRI scans were taken of the right arm in 7 static supine positions from 0° to maximum abduction, keeping maximum external rotation and horizontal extension. Using the custom motion analysis system, 3-dimensional models of the scapula and humerus were created from the MRI data. Then, the movement of the humerus and scapula was calculated using voxel-based registration of each model, and the motion of the glenoid on the humeral head was analyzed. RESULTS: The models demonstrated that glenoid contact shifted from the inferomedial to the superolateral portion of the humeral head. The mean widths of the glenoid track with the arm at 60°, 90°, 120°, and 150° of abduction were 20.7 ± 4.5 mm, 19.4 ± 3.9 mm, 18.9 ± 2.7 mm, and 18.7 ± 2.5 mm (89%, 83%, 82%, and 81% of the glenoid width), respectively. The width of the glenoid track at 60° of abduction was significantly greater than those at 90°, 120°, and 150° of abduction (P = .0472, .0148, and .0083, respectively). There were no significant differences among widths measured at 90°, 120°, and 150° of abduction. CONCLUSION: The existence and widths of the glenoid track were confirmed in vivo.
BACKGROUND: A Hill-Sachs lesion is a common injury associated with anterior glenohumeral instability, and a Hill-Sachs lesion that engages with the anterior glenoid rim is 1 factor related to recurrent instability. In a cadaveric study in 2007, a new concept, the "glenoid track," was proposed to evaluate the risk of engagement of Hill-Sachs lesions with the glenoid. PURPOSE: To investigate the glenoid track in vivo using a custom-developed noninvasive motion analysis system. STUDY DESIGN: Descriptive laboratory study. METHODS: Using a wide-gantry magnetic resonance imaging (MRI) scanner, the right shoulders of 30 healthy volunteers were examined. The MRI scans were taken of the right arm in 7 static supine positions from 0° to maximum abduction, keeping maximum external rotation and horizontal extension. Using the custom motion analysis system, 3-dimensional models of the scapula and humerus were created from the MRI data. Then, the movement of the humerus and scapula was calculated using voxel-based registration of each model, and the motion of the glenoid on the humeral head was analyzed. RESULTS: The models demonstrated that glenoid contact shifted from the inferomedial to the superolateral portion of the humeral head. The mean widths of the glenoid track with the arm at 60°, 90°, 120°, and 150° of abduction were 20.7 ± 4.5 mm, 19.4 ± 3.9 mm, 18.9 ± 2.7 mm, and 18.7 ± 2.5 mm (89%, 83%, 82%, and 81% of the glenoid width), respectively. The width of the glenoid track at 60° of abduction was significantly greater than those at 90°, 120°, and 150° of abduction (P = .0472, .0148, and .0083, respectively). There were no significant differences among widths measured at 90°, 120°, and 150° of abduction. CONCLUSION: The existence and widths of the glenoid track were confirmed in vivo.
Authors: Yara Younan; Philip K Wong; Spero Karas; Monica Umpierrez; Felix Gonzalez; Jean Jose; Adam Daniel Singer Journal: Skeletal Radiol Date: 2017-06-08 Impact factor: 2.199
Authors: Matthew L Vopat; Christina A Hermanns; Kaare S Midtgaard; Jordan Baker; Reed G Coda; Sana G Cheema; Armin Tarakemeh; Liam Peebles; Bryan G Vopat; Matthew T Provencher Journal: Orthop J Sports Med Date: 2021-06-03