The present invention relates to a guide tool for guiding surgical instrumentation and facilitating insertion of surgical implants for repair of cartilage and / or bone damage and/or for remodeling of a joint surface for improved mobility in a finger or toe joint wherein said guide comprises； - an attachment part comprising a patient specific contact surface adapted to fit of the proximal phalanxes or metatarsal bones in a toe or the distal-, middle-, or proximal phalanxes or metacarpal bones in a finger and further comprising a directing flange. Further the present invention relates to a design model designing a guide tool according to the invention and to the use of the instruments according to the invention.
