During the pitching motion, the resistance force, weight of the pitching arm and the contraction force of muscles set up a combination force along the pivot of the humerus.
在肩部的运动中，阻力，重力和肌肉的收缩力集中于肱骨轴线，通过盂肱关节面转换为与关节盂面垂直的压力和与关节盂面平行的剪力，作用于肩部活动的全过程。
During the pitching motion, the resistance force, weight of the pitching arm and the contraction force of muscles set up a combination force along the pivot of the humerus.
在肩部的运动中，阻力，重力和肌肉的收缩力集中于肱骨轴线，通过盂肱关节面转换为与关节盂面垂直的压力和与关节盂面平行的剪力，作用于肩部活动的全过程。
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