A Multicenter Cross-sectional Study of Shear Wave Ultrasound Imaging in Evaluating Supraspinatus Tendon Elasticity

Inclusion Criteria: ① Age range (above 18 years old); ② Non-professional athletes; ③ No medical history of shoulder and neck pain; ④ Ultrasound examination (-). Exclusion criteria: ① pregnant women or postpartum 1 year; ② Shoulder pain with active or passive cervical motion; ③ History of upper extremity trauma; (4) Shoulder surgery or treatment history, intra-articular injection history, use history of glucocorticoids, estrogens, quinolones and cholesterol drugs; (5) Shoulder joint fear test (shoulder joint abduction 90°, slowly increasing external rotation, the subject had a positive expression of fear); (6) Evidence of adhesive shoulder joint bursitis, such as the passive range of motion of the 2 motion planes of the shoulder joint is obviously limited; ⑦ Systemic autoimmune diseases, metabolic diseases, endocrine diseases, psoriasis; ⑧ unable to complete the relevant movements and positions; ⑨ Those who are reluctant to continue the experiment and ask to quit.