肩関節の回旋運動

概要

論文の詳細を見る
Information about rotation of the glenohumeral joint in various shoulder positions has been scarce. We hypothesized rotational patterns were different with the angle of abduction. The objective of the current study was to determine the contribution of arm abduction to rotation. Magnetic resonance images of 65 volunteers (38 men, 27 women) were obtained in 7 positions with the arm externally and internally rotated at abduction angles of 45, 90, 135 degrees and with the arm maximally elevated. Rotational angles and patterns were investigated using 3-dimensionally computer generated images. The change in rotational angle was large with the glenoid moving on a large portion of the humeral surface when the arm was rotated at lower abductions of 45 or 90 degrees. Rotational angles were more limited in external range at 135 degrees of abduction with the restricted joint motion and the humerus only swung in the same direction on the glenoid above 135 degrees of abduction. The glenohumeral rotation was the combined motion of 2 types reflecting shoulder functions: motion in a pendulum-like swinging manner that is suitable for stability when the arm was highly elevated; and motion in a spinning manner that is suitable for mobility when the arm was lowered.
日本肩関節学会の論文