Abstract: A knee prosthetic including a tibia part (1), which includes a tibia plate (2) that co-operates with at least one meniscal element by a first side (4), and co-operates with a tibia resection plan by a second side (5), including a tibia pin (3) connected with the tibia plate (2), which penetrates into the tibia to fix the tibia part (1) into it; and at least one compensating tibia block (6), which fits flatly between the second side (5) of the tibia plate (2) and the tibia itself, in order to compensate for a lack or absence of local bone tissue between the tibia and the resection plan. This tibia block (6) also co-operates with said tibia part (1) by way of complementary fixating means (10, 11) that are implemented on the tibia block (6) and tibia part, wherein the complementary fixating means are of the pin (10) and hole (11) type and are implemented on the tibia block and the base (9) of the tibia pin.