Injuries can impact any of the following structures:   

Shoulder dislocations and subluxations: Complete or partial displacement of the shoulder joint, often caused by trauma or extreme movement 

Rotator cuff tendinopathy/tears: Injury to the group of muscles and tendons surrounding the shoulder joint, commonly resulting in pain and weakness.

Glenoid labral injuries: Damage to the cartilage rim surrounding the shoulder socket, which can cause pain and instability.

Adhesive capsulitis (frozen shoulder): A condition causing stiffness and pain due to inflammation of the shoulder capsule.

Biceps injuries: Strains or tears in the biceps tendon, which helps stabilize and move the shoulder.

AC joint injuries: Damage to the acromioclavicular joint, typically caused by falls or direct impact.

GHJ osteoarthritis: Degeneration of cartilage in the glenohumeral joint, leading to stiffness and pain.

Pectoralis (pec) injuries: Strains or tears of the chest muscles affecting shoulder mobility and function.

Nerve entrapments: Compression of nerves around the shoulder, leading to pain, tingling, or weakness.