A dislocation can become worse by strained or torn fibrous tissue which connects the bones. The bones can only be pulled out of position by a powerful force, such as a blow to the shoulder. Extreme rotation can cause the humeral head to come out of the glenoid labrum.​

 Contact sports injuries are a common cause a dislocated shoulder as are motor trauma and falls.[1]Trauma from motor vehicle accidents and falls can lead to shoulder dislocation. [3]

The dislocation may occur anteriorly, posteriorly, inferiorly or anteriorly. Shoulder dislocations can be anterior and posterior dislocations. However, anterior dislocations are the most common. It represents 95% of shoulder dislocation.

Risk factors for re- dislocation

• Prior dislocation with poor tissue healing or soft tissue laxity.

• younger patients have a much higher frequency of re - dislocation as they are more active.

• Patients with torn rotator cuffs or fracture of the glenoid have a higher incidence of re- dislocation.

Sports this occurs most in are physical contact sports.