A modular surgical kit for repair of diseased cartilage at an articulating surface of a joint and a design method for a modular surgical kit are disclosed. The modular surgical kit is adapted for removal of damage cartilage and bone and also adapted for insertion of a medical implant a grafted plug or an artificial plug having an implant body with a predetermined cross-sectional profile and adapted for guiding insert tools during repair of diseased cartilage at an articulating surface of a joint. The modular surgical kit includes an implant, and a medical implant a grafted plug or an artificial plug having an implant body with a predetermined cross-sectional profile a guide base having a positioning body with a guide hole through said positioning body and a guide body with a guide channel, the guide channel having a cross-sectional profile that is designed to correspond to the cross-sectional profile of the implant body and having a muzzle. The modular surgical kit includes a drill adjustment device being arranged to enable adjustment of the drill depth. The positioning body has a cartilage contact surface that is designed to fit the contour of cartilage or subchondral bone in the joint in a predetermined area surrounding the site of diseased cartilage. The guide hole has a muzzle on the cartilage contact surface at a position corresponding to the site of the diseased cartilage. The positioning body includes a device for releasably connecting to the guide body such that, when connected, the guide channel is positioned in relation to the positioning body such that its muzzle emanates at a site corresponding to the site of implantation into the bone.
