<prompt> Avascular necrosis is the commonest in one of the following fracture -Garden 1 and 2 fracture of femoral neckGarden 3 and 4 fracture of femoral neckSub-trochanteric fracture of femoral neckBaso-trochanteric fracture  <response>: AVN and non-union are almost always seen with displaced fracture Gardens III IV and are less common with undisplaced fractures Gardens I II. 