This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Orthopaedics
Recurrent dislocations are least commonly seen in- 
Select and explain. 
A. Ankle, B. Hip, C. Shoulder, D. Patella
A: Ankle
Answer: A: Ankle 
Explanation: 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