The present invention discloses a knee joint prosthesis and the tibial component thereof and the femoral component thereof. The tibial component comprises a top surface, a bottom surface opposite to the top surface, and a first slot which passes through the top surface and the bottom surface and is adapted to accommodate an anterior cruciate ligament and a posterior cruciate ligament. A plurality of first protrusions are disposed on the bottom surface of the tibial component. Each of the first protrusion comprises at least one first through hole. The tibial component carries the femoral component. The femoral component comprises a second slot which is adapted to accommodate the anterior cruciate ligament and the posterior cruciate ligament. A plurality of second protrusions are disposed on the surface of the femoral component opposing to the tibial component. Each of the second protrusion comprises at least one second through hole.本發明揭示一種人工膝關節及其脛骨構件與股骨構件。脛骨構件包含有上表面、與上表面相對的下表面,以及第一凹槽。第一凹槽貫穿上表面及下表面,且用以容置十字韌帶。脛骨構件於下表面設置有複數個第一凸出部。第一凸出部各具有至少一第一穿孔。脛骨構件承載股骨構件。股骨構件包含有第二凹槽。第二凹槽亦用以容置十字韌帶,且股骨構件於遠離脛骨構件之一表面上設置有複數個第二凸出部。第二凸出部各具有至少一第二穿孔。K‧‧‧人工膝關節1‧‧‧脛骨構件1a‧‧‧第一部分1b‧‧‧第二部分1c、2c‧‧‧連結部11‧‧‧上表面12‧‧‧下表面13‧‧‧第一凸出部14‧‧‧第一穿孔15‧‧‧第一凹槽2‧‧‧股骨構件2a‧‧‧外側髁部2b‧‧‧內側髁部21、22‧‧‧表面23‧‧‧第二凸出部24‧‧‧第二穿孔25‧‧‧第二凹槽3‧‧‧襯墊
