Inui Hiroaki, Tanaka Hiroshi, Nobuhara Katsuya
Nobuhara Hospital and Institute of Biomechanics, 720 Haze, Issaicho, Tatsunoshi, Hyogo, 679-4017, Japan,
Surg Radiol Anat. 2014 Dec;36(10):1009-14. doi: 10.1007/s00276-014-1315-5. Epub 2014 May 27.
The objective of this study was to clarify the relationships among anatomical landmarks of the glenohumeral joint at different angles of abduction.
Fifteen volunteers (ten men, five women; mean age 29 years) were enrolled in this study. Images of externally and internally rotated positions at 45°, 90°, and 135° of abduction in the plane 30° anterior to the trunk were taken using an open magnetic resonance imaging system. Landmarks including the glenoidal long axis with its center, bicipital groove, center of the head, and humeral shaft axis were determined. Using a line set on the surface of the head in the plane parallel to the humeral axis (including the head center and bicipital groove with its parallel and perpendicular lines), the glenoid location and rotational relationships were investigated in each position.
The average angles of axial rotation were 48° ± 27° at 45º of abduction, 71° ± 20° at 90° of abduction, and 40° ± 27° at 135° of abduction. The trajectories of the glenoid center primarily extended over the anterior portion of the humeral head at 45° of abduction and over the posterior portion at 90° of abduction, while those at 135° of abduction were localized on a small upper portion of the head.
The glenohumeral relationships demonstrated that arm abduction might influence shoulder function through its effects on the portion of the humeral surface in contact with the glenoid during rotation and the resultant changes in the glenohumeral relationships.
本研究的目的是阐明在不同外展角度下盂肱关节解剖标志之间的关系。
15名志愿者(10名男性,5名女性;平均年龄29岁)参与了本研究。使用开放式磁共振成像系统拍摄在躯干前方30°平面内45°、90°和135°外展时的内旋和外旋位置的图像。确定包括盂长轴及其中心、肱二头肌沟、肱骨头中心和肱骨干轴线等标志。在与肱骨干轴线平行的平面内(包括肱骨头中心和肱二头肌沟及其平行线和垂直线),在头部表面设置一条线,研究每个位置的盂位置和旋转关系。
在45°外展时,轴向旋转的平均角度为48°±27°,在90°外展时为71°±20°,在135°外展时为40°±27°。盂中心的轨迹在45°外展时主要延伸至肱骨头的前部,在90°外展时延伸至后部,而在135°外展时则位于肱骨头的一小部分上部。
盂肱关系表明,手臂外展可能通过其对旋转过程中与盂接触的肱骨头表面部分的影响以及盂肱关系的相应变化来影响肩部功能。