正常与异常的冈下肌腱 The video clip shows a normal infraspinatus tendon. 点击放大 点击返回 The image shows an abnormal infraspinatus tendon. Abnormal: measure the medial to lateral distance of the tear. 点击放大 点击返回 The image shows an abnormal infraspinatus tendon. Abnormal: measure the depth of the tear. Then grade the tear by determining whether or not the tear invades/occupies 50% of the cuff or less; or 50% of the cuff or more before deciding if the tear is noteworthy.