This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Upper Limb Traumatology, Subject name: Orthopaedics
The posterolateral lesion in the head of humerus in cases of recurrent anterior shoulder dislocation is: 
Select and explain. 
A. Banka's lesion, B. Hill-Sachs lesion, C. Reverse Hill-Sachs lesion, D. Greater tuberosity avulsion fracture
B: Hill-Sachs lesion
Answer: B: Hill-Sachs lesion 
Explanation: Complication of shoulder dislocation: Banka's anterior glenoid labrum: anterior tear in anterior dislocation Hill Sach's at head of Humerus: posterolateral defect in anterior dislocation Reverse Hill Sach's - anteromedial defect in posterior dislocation Light bulb signis seen on AP radiographs in theposterior dislocation shoulder, where the humerus head appears as a light bulb Note-M/c complication of ant. dislocation of shoulder is reccurent shoulder disclocation