Abstract: A surgical tool assembly for Total Knee Arthroplasty (TKA) including a femoral intra-medullary (IM) rod, a femoral intra-medullary (IM) alignment guide, a distal femoral alignment guide, and a distal femoral cutting guide. After the femoral IM alignment guide is selected to fit the valgus angle and utilized with the femoral IM rod with respect to the distal femur, the distal femoral alignment guide is integrated to the complex. Then, the distal femoral cutting guide is slid to the distal femoral alignment guide in the orientation from distal to proximal through the sliding concave integrated with the sliding track.