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The movements of the shoulder-joint, with special reference to rupture of the supraspinatus tendon



The movements of the shoulder-joint, with special reference to rupture of the supraspinatus tendon



American Journal of Anat 66(2): 213-234



The humerus, when upright, always occupies the same situation as regards rotation of the bone on its long axis, no matter how it was carried into the upright attitude. But when it is carried up in the coronal plane, the end result should differ from that when it is carried up in the sagittal plane by a rotation of the humerus on its long axis of 180[degree]. That the end results of the two movements are identical is due to the fact that the humerus rotates laterally about 180[degree] when raised in the coronal plane. This rotation is caused partly by deltoid and supraspinatus muscles but mainly by the screw effect of the coraco-acromial arch, which is eccentrically placed with reference to the center of the glenoid cavity. The great muscles connecting the trunk with the humerus are inserted into the front of the bone, and if contracted, as in efforts to save oneself when falling, can prevent lateral rotation of the humerus. If in these circumstances the arm is forced upward in any other plane than the sagittal, the edge of the coraco-acromial arch bears against the insertion of supraspinatus and either that tendon is lacerated or the shoulder is dislocated. These points have been demonstrated by cinema pictures of these movements in living and in dissected subjects.

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Accession: 025861548

Download citation: RISBibTeXText

DOI: 10.1002/aja.1000660204


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