Bike accidents and sports collisions are common causes of shoulder dislocation. The most common position of the shoulder when dislocation occurs is out away from the body (abduction) and rotated outward (external rotation).

The doctor must test the shoulder for stability. It's important to see if the shoulder will dislocate again. This position is called the shoulder apprehension test. A positive test shows on the patient's face by pain and fear of another dislocation. The doctor may feel the head of the humerus slide forward during the test, too.

The apprehension test is an important part of the diagnosis and helps the doctor plan the best treatment. Does the patient need surgery? Or is a rehab program the best choice? It's better to know the extent of the damage from the first shoulder dislocation before a second one occurs.