Most of the square shoulder deformities develop in young adults, and most patients have active tuberculosis at the same time. Since there is localized pain in the early stages, which is relieved at rest, it is easy to be ignored by the patient and results in square shoulder deformity. The examination of square shoulder deformity usually includes the shoulder hitch test, straightedge test and biceps resistance test. 1.Shoulder hitch test: also known as Dugas’ sign and shoulder-elbow-chest test. If the patient flexes the elbow, it is normal if the elbow is close to the chest wall while the hand is on the opposite shoulder, but if the patient cannot complete the above action or can only complete one of the two actions, it is positive, suggesting the possibility of shoulder dislocation. 2.Straight ruler test: The normal shoulder peak is located on the medial side of the line connecting the lateral epicondyle of the humerus and the greater tuberosity of the humerus. The examiner uses the edge of the straightedge to stick to the lateral side of the patient’s upper arm, and if one end is stuck to the lateral epicondyle of the humerus and the other end is in contact with the shoulder peak, it is positive, suggesting a shoulder dislocation. 3.Biceps resistance test: It is also called Yergason’s test. The patient flexes the elbow at 90°, the examiner holds the elbow with one hand and the wrist with the other, and the patient is instructed to flex the elbow and rotate the forearm backwards, the examiner gives resistance, if the biceps tendon slips out, or the pain is generated at the inter-nodal groove, the former is biceps longus tendon slippage, the latter is biceps longus tendinitis.