in the radius 1 and or the scaphoid 2 using a suitable bone preparation device in contrast to prior wrist replacement procedures in which a portion of the radius 1 scaphoid 2 and or lunate 3 that is proximate to the joint space 5 is reshaped or resected surfaces of the radius 1 the scaphoid 2 and or the lunate 3 facing the joint 5 are not resected or reshaped to form the slot 410 the slot 410 simply provides a recess in the radius 1 and or scaphoid 2 to allow the implants 100 b and 200 d to be anchored to the radius 1 and or the scaphoid 2 respectively the slot 410 is formed in the side of the radius 1 opposite to the ulna 4 and in the side of the scaphoid 2 opposite to the lunate 3 after the slot 410 is formed the carpal implant 200 d and or the radial implant 100 b are implanted the carpal implant 200 d is implanted such that the stabilizing fin 250 d is laterally inserted into the slot 410 of the scaphoid 2 from the radial side of the wrist joint similarly the radial implant 100 b is implanted such.