The critical shoulder angle (CSA) constitutes a straightforward and highly reproducible tool. Degenerative rotator cuff tears (RCT) are associated with a significantly larger CSA. In this review, the most relevant features of the CSA are summarized: (1) the relationship between the CSA and RCT pathophysiology, (2) accurate measurement of the CSA according to various imaging modalities, (3) the contribution of the CSA in predicting the occurrence of RCT, and (4) RCT recurrence after surgical repair.

中文翻译：

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临界肩角：放射科医生需要知道什么？

临界肩角（CSA）构成了一种直接且高度可重复的工具。退行性肩袖撕裂（RCT）与明显更大的CSA相关。本文对CSA的最相关特征进行了总结：（1）CSA与RCT病理生理之间的关系；（2）根据各种成像方式准确测量CSA；（3）CSA在预测中的作用RCT的发生，以及（4）手术修复后RCT复发。