【Objective】To observe the curative effect of arthroscopy acromion plasty treated acromion impingement through shoulder arthroscopy, and explore methods for the treatment of acromion impingement. 【Methods】Between August 2006 and December 2012, 32 patients(32 shoulders) were operated on by the same surgeons for shoulder impingement syndrome under shoulder arthroscopy. All the patients received MR examination. The AP and the supraspinatus outlet projection of the X-rays were obtained pre-operation. The UCAL(Un...