Clinical experiment group: there was no significant difference comparing the thickness of the pectoralis major muscle and the muscle strength of the adductor and the angle of adduction of the wrong side with the good side ( P > 0.01) .

• 临床实验组:患侧胸大肌厚度和患侧上臂内收肌力与健侧比较差异无显著性(P>0.；01)。