"...a shoulder dislocation is when the humerus separates from the shoulder joint and is the most common of the large joint dislocation normally the shoulder joint is made up of the head of the humerus articulated with the glenoid fossa of the scapula which is why it is known as the glenohumeral or joint it is a synovial ball and socket joint with a large range of motion but at the cost of being more unstable the head of the humerus is around four times larger in the shallow surface area of the glenoid fossa which contributes to the large range of motion but also to the instability the joint is stabilized by surrounding the glenoid labrum is a bring of fibrocartilage around the glenoid fossa that better anchors the humerus and glenoid and there are also a number...arm in an anterior dislocation due to the posterolateral portion of the humeral head being compressed against the anterior part of the glenoid labrum they can be compression fractures on the humerus known as Hill Sachs lesions they are closely linked with bankart lesions which is a rupture in the glenoid labrum these can also be accompanied by avulsion fractures which are then termed bony bankart lesions the arm is typically held in external rotation with some abduction and all movements are painful there is a loss of the normal Contour of the deltoid and the acromion can be particularly prominent posterior dislocation 's make up only two to four percent of all shoulder dislocations and occur due to the head of the humerus being forced posteriorly while..."
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