What happens when the arm bone becomes rotated inward?

When the arm bone becomes rotated inward due to muscle tightness or scapular problems, the forearm rotates downward (pronation). The forearm muscles controlling this motion -- the pronators -- will then shorten because their full range of motion is no longer used or needed. When the pronators get short and tight, the muscles opposing forearm pronation, the supinators, lengthen to compensate.

These adaptations (anatomical changes) affect the function of muscles that bend and straighten the wrist because now the forearm is relatively rotated while these muscles are working.

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