<prompt> Pipkin fracture is defined asHead of radius fractureHead of femur fractureFracture dislocation of ankleFracture neck of femur  <response>: Pipkin fracture is defined as head of femur fracture. pipkin types dislocation of hip with fracture of femoral head type 1 : femoral dislocation of the hip with fracture of femoral head caudad to fovea centralis type 2: posterior dislocation of the hip with fracture of the femoral head cephalad to the fovea centralis type 3: type 1 type2 with associated fracture of femoral neck type 4 : type1,2,3 with associated fracture of acetabulum Ref: Textbook of Ohopaedics, John Ebenezer, 6th edition, page no 214 