The invention relates to an implantation system for implantation into a bone of a patient, comprising:- a longitudinal pin implant for inserting into a first bone part of the bone, wherein the pin implant has a front section with one or more groove-like cut-outs extending in axial direction of the front section and opening towards the front end of the implant, wherein at least one of the cut-outs is provided as a guidance cut-out which extends over the full length of the pin implant；- a bone plate including∘ an attachment portion for attachment onto an outer surface of a second bone part, and∘ a guidance sleeve for slidably holding the pin implant and including at least one guidance structure to engage with the at least one guidance cut-outs
