<prompt> An elderly woman was admitted with a fracture of the neck of right femur which failed to unite. On examination an avascular necrosis of the head of femur was noted. The condition would have resulted most probably from the damage to -Superior gluteal arteryInferior gluteal arteryAcetabular branch of obturatorRetinacular branches of circumflex femoral arteries  <response>: The major blood supply of femoral head is by lateral superior retinacular branch of medial circumflex artery. It is involved in AVN. 