A knee spacer system having a tibia component (1), wherein the tibia component(1) has atibia prosthetic body, wherein the tibia prosthetic body has two runningsurfaces and at leastone mounting surface (5, 6) for mounting the tibia component (1) on a tibia, afirst connectingmeans (8) for feeding a medical irrigation fluid into the tibia prostheticbody, a secondconnecting means (9) for draining a medical irrigation fluid from the tibiaprosthetic body, anirrigation fluid inlet opening in a surface of the tibia prosthetic body,wherein the first connectingmeans (8) is connected to the irrigation fluid inlet opening, an irrigationfluid outlet opening inthe surface of the tibia prosthetic body, wherein the second connecting means(9) is connectedto the irrigation fluid outlet opening, at least one irrigation fluid exitopening (22) in the surfaceof the tibia prosthetic body, which is connected in the interior of the tibiaprosthetic body withthe irrigation fluid inlet opening, and at least one irrigation fluid entryopening (24) in the surfaceof the tibia prosthetic body, which is connected in the interior of the tibiaprosthetic body withthe irrigation fluid outlet opening, wherein the at least one irrigation fluidexit opening (22) andthe at least one irrigation fluid entry opening (24) are arranged outside theat least onemounting surface (5, 6).
