الفهرس 
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Abstract
Aim of the work
To provide a relationship between rotator cuff lesions and instability. It has been reported that in the elderly population traumatic dislocations may be accompanied by rupture of the supraspinatus or other tendons of the cuff.
Summary
The treatment of shoulder instability caused by rotator cuff injury must be done through a conservative or surgical treatment of rotator cuff can be achieved according to the type of the tear which classified according to chronology into acute and chronic types, and according to shape, size and cause into the full thickness tear, the partial thickness tear and the rotator interval lesion.
Conservative treatment can be done through a medical treatment, support in sling for 4-7 days and the use of one or two subacromial steroid injections.
Surgical treatment can be done and there are several procedures which are the direct closure, the free biceps graft, the Mc-laughlin repair, the freeze dried rotator cuff graft, tendon transfer, repair of cuff using a synthetic fabrics and the use of the acropole prothesis.
Failed repair may be occur due to several factors which include a large or massive tear, poor quality of cuff tendon, an inadequate repair, to deltoid origin and inadequate support post operatively or improper rehabilitation.
The technique of operative management at failed repair differs according to the cause of failure of the repair.
The postoperative management depends upon the size of the tear and the type of the repair.