<prompt> Below knee, amputation is done at the level of5 cm below tibial tuberosity10 cm below tibial tuberosity15 cm below tibial tuberosity20 cm below tibial tuberosity  <response>: In below knee amputation, approximately 10 cm below the tibial tuberosity, an anterior incision of two-thirds of the circumference is created.Posterior flap is taken longerRef: Bailey and love pg: 958 