<prompt> All the following are responsible for the increased incidence of Non-Union following Fracture neck of the femur exceptVascular compromiseInadequate immobilizationPresence of synol fluidDistracting force vector  <response>: In adequate immobilization is not one impoant factor which is responsible for non union as in other fractures, vascular compromise is an impoant cause. Synol fluid is supposed to exe an inhibitory effect by dissolving the callus. Ref: Maheshwari 6e pg 137. 