（214-217题共用题干）李某，针灸科实习医生。为给某摔跤运动员治疗髓关节扭伤，取2寸针针刺环跳。因考虑到患者肌肉肥厚、体质壮实，应尽可能深刺重刺以使之得气，故将针刺人至针根处。起针后，发现针身折断在患者体内，刚好与皮肤相平。此患者断针的原因是

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