The shoulder joint is the main joint of the shoulder and consists of the spherical humeral head and the scaphoid articular glenoid. The humeral head is surrounded by cartilage and the head faces laterally and anteriorly. The capsule of the shoulder joint is thin and flaccid, which allows for a wide range of motion in the shoulder joint. The glenoid labrum increases the depth of the joint surface, which allows the joint to expand and extend and increases the stability of the joint. Surrounding the shoulder joint is the sternoclavicular joint, which is the joint formed by the sternum and clavicle and is surrounded by the joint capsule and tough ligaments. The acromioclavicular joint is the joint formed by the scapula and the clavicle. The clavicle is an elongated S-shaped bone that is connected to the scapula by ligaments. The scapulothoracic wall joint is a pseudo-joint because it does not have the structure of a joint, but can move like a joint, with the scapula sliding along the gap between it and the ribs of the chest wall. The shoulder joint is very mobile because it has a small, shallow glenoid and a loose capsule. The upper arm can be elevated from 0 to 180 degrees, internally or externally rotated at an angle of approximately 150 degrees, and anteriorly and posteriorly rotated in the horizontal plane at an angle of up to 170 degrees. The 26 skeletal muscles surrounding the shoulder joint work together in a coordinated manner to give the shoulder joint a rich and powerful function. The stability of the shoulder joint is divided into static stability (capsule ligaments, joint contents, negative pressure in the joint cavity and glenoid labrum) and dynamic stability (the muscles surrounding the shoulder provide dynamic stability to the shoulder joint and the rotator cuff is the key to the stability of the glenohumeral joint during motion). The role of the infraspinatus and teres minor is to maintain stability by increasing the contact area of the joint through external rotation of the humeral head. The role of the subscapularis is to protect the anterior shoulder structures and to assist in the inward rotation of the limb. The role of the long head biceps tendon is to pull down on the humeral head during movement. The pectoralis major and latissimus dorsi act synergistically to allow internal rotation of the shoulder joint. The deltoid is an important stabilizing muscle and cushions the scapula from stretching. Shoulder pain is very common, especially in sports that require raising the hands above the head, but also in other populations. Acute sports injuries are more common in the lower extremities, and for chronic injuries it is more common in the upper extremities. In the event of a shoulder injury, we need to provide the doctor with the following information – what happened? Where is the injury? What is the nature of the pain? Under what conditions are the symptoms worsening or relieving? Has there been a previous injury? Has any previous treatment been done? What was the effect?