What are the main positive signs of rotator cuff injury?

The main positive sign is tenderness in the space between the anterior and inferior aspect of the acromion and the greater tubercle. Crepitus can be heard during movement. The pain arc sign is positive, and there is pain in the range of 60°-120° when the affected arm is abducted and raised. The impact test was positive, and there was pain when the greater tubercle of the humerus impinged on the acromion. The upper arm drop test is positive, and the patient falls because he is unable to actively lift his upper limb or is unable to hold the affected limb due to pain or weakness. When the disease lasts for more than three months, the shoulder joint develops secondary contracture, and the range of motion is restricted to varying degrees, with obvious limitations in abduction, external rotation, and lifting. Patients with severe rotator cuff tears have severely limited lifting and abduction functions, and the range of abduction and forward extension is less than 45 degrees. Imaging diagnosis The supraspinatus exit image is very important to understand the structural stenosis of the rotator cuff exit. MRI is currently a commonly used method for clinical diagnosis of rotator cuff injuries. MRI is non-invasive to the human body, has good contrast and soft tissue resolution, has a high diagnostic accuracy, and can perform multi-plane imaging to observe the rotator cuff muscle cavity and its damage, especially for partial tears of the rotator cuff, with a higher diagnostic rate. high.