中立位和旋前位使髁上内侧产生拉应力，髁上外侧产生压应力。
While in neutral and pronator position, the pulling stress is in medial part and the pressing stress is in lateral part.
而对于同一定点，其与桡神经深支的距离按旋前、中立、旋后位的顺序越来越远。
With the forearm in pronation, neutral and supination sequently, every fixed point became farther and farther from the deep branch of radial nerve.
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