Anterior and Posterior Capsule- Periosteal sleeve avulsion as an unusual cause of Shoulder Instability

Traumatic anterior shoulder instability is a typical condition in young people and athletes. There are many different injuries that may be present, producing or coexisting with shoulder instability, in addition to classic Bankart lesion. Post-traumatic shoulder dislocation is much less common, between 2% to 5% of all shoulder dislocation, ascending to 10% on contact sports people. The most common causes are seizures, high energy trauma and electrocution. Traumatic multidirectional instability without hypermobility is extremely rare. We have found no reports in literature about a similar case.