The present invention relates to a total knee arthroplasty used in a knee joint, including a tibia and a femur of an object that is to be treated. More particularly, the present invention relates to a tibial alignment device, comprising: an upper part that can be coupled to a tibial cutting guide during an artificial knee joint surgery； and a lower part that is vertically coupled to the upper part such that the lower part can slide, wherein the upper part comprises a cutting guide coupling part for mounting the tibial cutting guide on the upper part, and a connecting part for connecting the upper part and the lower part； the lower part comprises an ankle forceps part for fixing the tibial alignment device to an ankle that is to be treated； the cutting guide coupling part may be coupled to or separated from the cutting guide at various angles； the cutting guide coupling part comprises a fastening member that can be coupled to the tibial cutting guide such that the fastening member may be movable up and down, and a receiving member for receiving the fastening member such that the fastening member can slide； the fastening member comprises a coupling part that protrudes in an insertion direction of the cutting guide coupling part at the upper end of the fastening member to be inserted into and coupled to the tibial cutting guide； the receiving member comprises a coupling part that protrudes in the insertion direction of the cutting guide coupling part at the upper end of the receiving member to be inserted into and coupled to the tibial cutting guide； and the coupling part of the fastening member is configured to be able to adjust spacing with respect to the coupling part of the receiving member so as to be attachable to and detachable from the tibial cutting guide at various angles.La présente invention concerne une arthroplastie totale du genou utilisée dans une articulation du genou, comprenant un tibia et un fémur d'un objet à traiter. Plus particulièrement, la prés
