Implants, and processes for installing them, which replace the medial
condyle and portions of the patellofemoral channel but preferably not portions of the lateral
condyle that articulate relative to the
tibia. Processes are provided which allow proper location and orientation of an anterior resection and a distal resection on the
femur, which make use of a
transition point which can be designated on the bone, for navigating proper positioning of such implants. Proper positioning of the
implant relative to the
femur for insuring a smooth transition between lateral portions of the
implant and the lateral
condyle is thus reduced to determining proper medial / lateral location of the
implant on the anterior and distal resections. Such implants and processes can allow, among other things, for controlled location and orientation of an implant on the bone which saves lateral compartment bone, which eliminates the need to sacrifice the anterior and posterior cruciate ligaments, and which is adapted for minimally
invasive surgery with its attendant benefits.