抄録
Using a VICON system, we conducted a movement analysis of the scapula during pitching motion with two adult males (right-handed). There were a total of seven places where markers were set on the subjects. Three markers were set on the truncus: two on the thoracic vertebrae spinous process and one on the superior border of the sternum. Every two maykers were set to the upper right arm and the scapula, and to the scapula, and two K-wires were inserted into the scapular spine. The results showed a large movement of the scapula, over 30°against the truncus in three planes during a pitching motion which did not involve the stepping forward action. Such a movement was co-ordinated with the movement of the upper arm. Generally speaking, rotator cuffs or gleno-humeral joints tend to be impaired by the pitching motion. Until now, we considered fixing the scapula to the truncus during a pitching motion. However, the results of this present report show that we should consider the scapula as not being fixed to the truncus. Furthermore, we should consider that a decrease in ROM of the scapula may cause an increase in the load onto the gleno-humeral joint. Hence, we suggest that it is important to evaluate ROM of the scapula and the function of the scapulo-thoracic joint as a“pitching motion with less possibility of causing impairment”.
