目的 探讨MRA检查对肩袖部分 撕裂的诊断价值。方法 回顾性分析79例 肩袖部分撕裂的MRA及MRI表现，与肩关 节镜手术结果对照。结果 79例肩袖部 分撕裂病例，MRI诊断的敏感度、特异 度及准确度分别是94.74％、76.12％和 95.18％；MRA仅能对肩袖部分撕裂中的 32例内层(关节面)撕裂明确显示，其敏 感度、特异度及准确度分别为96.88％、 100％、98.73％，明显高于常规MRI诊 断，与关节镜结果对比，其一致性极佳 (Kappa=0.970)，差异均有统计学意义(P ＜0.05)；而对于部分撕裂中的外层(滑囊 面)撕裂和中间层(肌腱内)撕裂，MRA均不 能显示。结论 MRA能准确判断肩袖内层撕 裂范围及程度，是MRI诊断肩袖部分撕裂 的有效补充，为临床诊断和治疗能提供更 准确的依据，而对于肩袖外层撕裂和中间 层撕裂，MRA均不能显示其损伤部位及程 度，无法对其进行诊断。

Objective To investigate the value of MR arthrography (MRA) in the diagnosis of partial tear of rotator cuff. Methods A retrospectively analysis was made to MRA and MRI performance of 79 cases with partial tear of rotator cuff, and contrasted it with the results of arthroscopy. Results For all 79 cases with partial tear of rotator cuff, the diagnostic sensitivity, specificity and accuracy of MRI were respectively 94.74％,76.12％ and 95.18％. MRA could only clearly show 32 cases with the inner layer (articular surface) tear of rotator cuff, and the sensitivity, specificity and accuracy were respectively 96.88％,100％ and 98.73％, which were obviously higher than conventional MRI. Compared with arthroscopy, the diagnostic results showed excellent consistency(Kappa=0.970), and the difference had statistical significance(P＜0.05). However, MRA wasn't able to show the outer layer (slippery bursa) and the intermediate layer (tendon) tear of rotator cuff. Conclusion MRA, an effective complement of MRI in the diagnosis of partial tear of rotator cuff, can accurately determine the scope and degree of the inner layer tear of rotator cuff, and it can provide more accurate basis for clinical diagnosis and treatment. However, for the outer layer and the intermediate layer tear of rotator cuff, MRA are not able to diagnose and show the damage the location and degree