I have a chronic dislocating shoulder that needs fixing. The doctor told me there's still a 25 percent chance the joint can dislocate again even after repair. Why is that?

Studies show that shoulder dislocation after repair occurs anywhere from 12 to 24 percent of the time. There are different reasons for this. Sometimes it depends on the type of surgery done to repair the problem.

For example, an open incision allows the surgeon to repair the tear in the cartilage and tighten up the joint capsule at the same time. Arthroscopic surgery may only include repair of the damaged soft tissue while leaving the capsular laxity alone.

Another factor in repeat dislocations after surgery is the patient. It's important to follow the surgeon's instructions. A shoulder sling may be needed for up to four weeks. Exercises must be done daily. Doing too much too soon is a common way to undo the benefits of the surgery.