The glenohumeral micromotion and influence of the glenohumeral ligaments during axial rotation in varying abduction angle |
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| Institution: | 1. Department of Orthopaedic Surgery, Osaka University Graduate School of Medicine, 2-2 Yamada-oka, Suita City, Osaka, 565-0871, Japan;2. Department of Information Systems, Saitama Institute of Technology, Fukaya City, Saitama, Japan;3. Department of Orthopaedic Biomaterial Science, Osaka University Graduate School of Medicine, Suita City, Osaka, Japan;4. Department of Health and Sport Sciences, Osaka University Graduate School of Medicine, Suita City, Osaka, Japan;1. Department of Physiotherapy and Rehabilitation, Faculty of Health Sciences, Izmir Katip Celebi University, Izmir, Turkey;2. Ankara Physical Therapy and Rehabilitation Training and Research Hospital, Ankara, Turkey;1. Department of Orthopedics, Xuanwu Hospital, Capital Medical University, Beijing, China;2. National Clinical Research Center for Geriatric Diseases, Beijing, China;1. Tokyo Dental College Ichikawa General Hospital, Department of Orthopaedic Surgery, 5-11-13 Sugano, Ichikawa, Chiba, Japan;2. Shiraishi Spine Clinic, 1-5-1 Marunouchi, Chiyodaku, Tokyo, Japan;3. Murayama Medical Center, Department of Orthopaedic Surgery, 2-37-1 Gakuen, Musashi-Murayama, Tokyo, Japan;4. Saiseikai Yokohamashi Tobu Hospital, Department of Orthopedic Surgery, 3-6-1 Shimosueyosi, Tsurumiku, Yokohama, Kanagawa, Japan;5. Kawasaki Municipal Hospital, Department of Orthopedic Surgery, 12-1 Shinkawadori, Kawasakiku, Kawasaki, Kanagawa, Japan;1. Department of Orthopedic Surgery, The No.904 Hospital of Peoples Liberation Army, Wuxi 214000, China;2. Wuxi Clinical College of Anhui Medical University, Wuxi, 214000, China;1. Clinic for Orthopedics and Trauma Surgery, Heidelberg University Hospital, Schlierbacher Landstraße 200a, 69118 Heidelberg, Germany;2. Swabian Joint Centre, ATOS Clinic Stuttgart, Hohenheimer Straße 91, 70184 Stuttgart, Germany |
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| Abstract: | BackgroundThe patients with shoulder instability or disorders in overhead athletes have been considered to have an abnormal micromotion at the glenohumeral joint. However, the normal range of the micromotion has not been available during axial rotation with various abduction angles, especially above 90° abduction. This study aimed to investigate the glenohumeral translation and influence of the glenohumeral ligaments during axial rotation with up to maximum abduction.MethodsFourteen healthy volunteers performed active axial rotations at 0°, 90°, 135°, and maximal abduction angles. The positions of the humeral head center relative to the glenoid at maximally external, neutral, and maximally internal rotations (ER, NR, IR, respectively) for each abduction angle were evaluated using two- (2D) and three-dimensional (3D) shape matching registration techniques. The shortest pathway and its length between the origin and insertion of the superior, middle, and inferior glenohumeral ligaments (SGHL, MGHL, and IGHL, respectively) were calculated for each position.ResultsThe glenohumeral joint showed 3.1 mm of superoinferior translation during axial rotation at 0° abduction (P < 0.0001), and 2.6 mm and 4.5 mm anteroposterior translation at 135° and maximal abduction (P < 0.0001), respectively. The SGHL and MGHL reached a maximum length at ER with 0° abduction, and the anterior and posterior bands of the IGHL reached a maximum at ER with 90° abduction and IR with 0° abduction.ConclusionsThese findings indicated that the SGHL played a role as an inferior suppressor at 0° abduction, while the anterior band of IGHL played a role as an anterior stabilizer at 90° abduction. Every glenohumeral ligament did not get taut and the anteroposterior translation became greater with increasing abduction angle, above 90°. These results could be used as a reference when comparing with the pathological shoulders in the future study. |
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