What is the risk of dislocation?
About 1-2% of people will have a shoulder dislocation during their lifetime, mostly due to trauma.
Young men (20-30 years) are the most common dislocators, although in the elderly population, females out-rank males by about 3:1.
What is the lifetime risk of re-dislocation?
The recurrence rate is about 50%, although almost all those who dislocate between the ages of 14-20 will have a recurrence.
Age is a major factor in likelihood of recurrence:
<20 years: recurrence rate 80-94%. Bankart’s lesion and its association with inferior glenohumeral ligament damage appears to be the major factor contributing to the high recurrent rates seen in this group.
20>40 years: recurrence rate 26% – 48%. The major pathology in this group is disruption of the labral attachment of the glenohumeral ligaments.
>40 years: recurrence rate 0-10%. The major pathology in this group is tears of the rotator cuff.
Recurrence also alters according to associated injuries. Greater tuberosity fractures are associated with lower rates of recurrence (4.5%), whereas both Bankart’s and Hill Sachs lesions are strongly associated with recurrence.
Finally a low degree of trauma producing dislocation is associated with high recurrence rates (86%).