根據Stats Inc，過去三年投手列入傷兵名單801人次，其中258人次，約32%是因為肩膀受傷，比起其他傷勢都還來得多。
The problem stems from two factors: the complexity of the shoulder joint
and the stress put on it by pitchers. During a pitch, the shoulder
turns 7,000 degrees per second. There are 22 muscles that surround the
joint, Kremchek said, and all of them have to work in sequence.
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