Here is a case of recurrent anterior shoulder dislocation on top of a combined bony Bankart lesion and Hill Sachs defect known as bipolar shoulder lesions.
non-engaging, on-track Hills-Sachs defect: Hill-Sachs interval < glenoid track
engaging, off-track Hills-Sachs defect: Hill-Sachs interval > glenoid track
In this case, there is no significant boney bridge between the rotator cuff attachment and lateral aspect of the Hill-Sachs defect in the axial plane and therefore the Hill-Sachs interval approximately corresponds to the size of the Hills-Sachs defect.