<prompt> Injury to popliteal aery in fracture lower end of the femur can be caused byProximal fragmentMuscle haematomaDistal fragmentTissue swelling  <response>: In distal third shaft fracture or supracondylar femur fracture, the distal fragment is tilted backward due to strong gastrocnemius pullThis posteriorly tilted distal fragment can cause popliteal aery injury Refer: Mohindras Fundamentals of Ohopedics, 2nd edition, pg no. 125, 496 