Precisely what is dislocation of the shoulder? What can cause a shoulder dislocation?

The shoulder joint stands out as the most mobile joint within the human body and permits the arm to move in numerous directions. The versatility and potential to move in many directions has one downside and that is that it leaves the shoulder joint at risk of being unstable and becoming dislocated easily. The end of the upper arm bone (humerus) is referred to as the head of the humerus and this is the part that fits in the glenoid fossa (shoulder joint). Because the glenoid fossa (fossa = shallow depression) is very shallow, many other structures within and all around the shoulder joint are needed to preserve it's stableness. Within the joint, the labrum (a fibrous ring of cartilage) stretches from the glenoid fossa and provides a deeper container for the humeral head. The solid connective tissue that forms the capsule of the shoulder joint helps provide stableness to the joint. The tendons from the rotator cuff muscles supply a substantial amount of support for the shoulder joint. shoulder dislocation   Shoulder dislocations happen as a result of the humerus bone being displaced from the glenoid fossa. Dislocations of the shoulder can occur in a variety of various directions, and these directions are based on where the humeral head ends up in relation to the glenoid fossa. Ninety percent or more of shoulder dislocations are anterior dislocations, which means that the humeral head has been relocated to a position in front of the joint. Posterior dislocations are those where the humeral head has relocated backward toward the shoulder blade.