Patient-adapted and improved articular implants, designs and related guide tools

A patient specific knee implant system for implantation in a knee joint of a patient, comprising:

• a femoral implant for implantation on a femur of the patient and a tibial implant for implantation on a tibia of the patient,
• the femoral implant including a condyle portion having a curved condylar shape and having an outer surface configured to articulate with the tibial implant when the tibial and femoral implants are implanted in the knee joint of the patient and an inner surface configured to abut one or more bone cut surfaces of the femur of the patient when the femoral implant is implanted in the knee joint of the patient, and
• the tibial implant including a bearing surface configured to articulate with the outer surface of the femoral implant when the tibial and femoral implants are implanted in the knee joint of the patient, and a bone-facing surface configured to abut a surface of the tibia of the patient when the tibial implant is implanted in the knee joint of the patient,
• wherein the outer surface of the condyle portion includes shape information of a J-curve of a femoral condyle of the knee joint of the patient.