The present invention relates to a method for designing an implant comprising designing a contour curvature of the implant so that an articulating surface of the implant is designed to correspond to a simulated healthy articulating surface of a damaged articulating surface of a joint. The implant is provided with at least one positioning mark designed to be used for determining the orientation in which the implant is to be placed in a recess made in a damaged articulating surface of a joint. Further, the present invention relates to methods for positioning and inserting a medical implant in a recess.