Bankart's lesion is seen at -

When the labrum of the shoulder joint is torn, the stability of the shoulder joint is compromised. A Specific type of labral tear is called a Bankart's lesion. A Bankart's lesion occurs when an individual sustains an anterior dislocation. As the shoulder pops out of the joint, it often causes a tear of the labrum and stripping of periosteum from the anterior surface (more specifically anteroinferior) of glenoid. In severe injuries, there may be avulsion of a piece of bone from the antero-inferior glenoid rim, called bony Bankart lesion.