抄録
Five macaca mulattas were our subjects, and we conducted examinations of their scapular movements with elevations of the upper extremities in the scapular plane and flexion-extentions in the horizontal plane using radiography and a video camera. As a result of the examinations we recognized coordinated movements of the scapula of the upper arms, known as the gleno-humeral rhythm, in both motions. We have already suggested that a gleno-humeral rhythm exists in all of the various movements of the upper extremities in our previous motion analysis of human scapulas, at that time, we used on X-ray CT or VICON for the horizontal flexion-extention of the shoulder joint. A comparative anatomy, shows that both the Monkey family and the genus Homo have similar structures. The results of this present report support this, and further confirm that the scapula and the clavicle's movements are always co-ordinated with the upper arm. The trend is usually to ignore the movement of the scapula except for in the elevation of the shoulder joint, and consider the scapula to be fixed to the truncus. That is probably because; it is difficult to distinguish the movement of the scapula from that of the truncus; clinically there are a very limited number of impairments and opportunities for therapy of scapulo-thoracic joints; there is no precise and simple, easy way to analyze the movements of the scapula; and therefore, interscapulo-thoracic muscles should be omitted. However, we suggest here that we should take the movement of the scapula into consideration with regards to sports activities or the mechanism of impairments since this scapulo-thoracic joint originally has a considerably large ROM and an important function.
