A transversal support tibial plateau consisting of two joint surfaces, two joint surface supports and a transversal support is described. This transversal support tibial plateau is arranged in such a way that the joint surfaces can be introduced separately from the front into the knee joint. This arrangement simplifies the surgical procedure, while the ventral corticalis is preserved. Owing to the construction with separate joint surface supports and joint surfaces, the joint surface supports can first be secured on the transversal support, for example, by means of support screws. Alternatively, the joint surface supports or the joint surface units can first be implanted obliquely from above with preservation of the ventral corticalis and then be received and supported from the side by a transversal support of corresponding design.