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What is Recurrent dislocations are least commonly seen in- and explain in detail?
First I would like to differentiate between dislocation and subluxation.

Dislocation Vs Subluxation

Dislocation is complete separation of articular surfaces of a joint.
Subluxation is a symptomatic abnormal separation of articular surfaces of a joint without complete separation (dislocation), i.e., symptomatic partial separation.

Joints with recurrent dislocations

Shoulder (most common)                  Elbow (rare                Temporomandibular joint
Patella (2nd most common)               Hip (rare)                    Sternoclavicular