Patent ID: 8088167

Claim:
A femoral prosthetic implant for attachment to a femur during a knee arthroplasty procedure, the femur having a long axis, the implant comprising: an outer bearing surface having a condylar portion and a patellofemoral portion; an inner bone contact surface in back to back disposition with the outer bearing surface, the inner bone contact surface including a posterior contact surface and an anterior contact surface configured to contact geometrically corresponding bone cuts in the femur and a distal contact surface, and at least one inwardly protruding structure formed unitarily with the implant with at least one bone contacting surface extending in both an anterior to posterior direction and inwardly of the inner bone contact surface to provide medial-lateral fixation stability between the implant and the femur, and wherein: the anterior contact surface has a profile viewed in a mediolateral direction defining an anterior fixation path that is configured to diverge proximally away from the long axis of the femur and at least a portion of which has a linear profile when viewed in the mediolateral direction; no portion of the anterior fixation path is configured to converge proximally toward the long axis of the femur when viewed in the mediolateral direction; the posterior contact surface has a profile viewed in the mediolateral direction defining a posterior fixation path that is configured to converge proximally toward the long axis of the femur; the posterior fixation path of the posterior contact surface and the anterior fixation path of the anterior contact surface converge toward one another proximally of the distal contact surface when viewed as projected on a plane defined normal to the mediolateral direction; and the implant is configured to fit a femur having a posterior cut surface and an anterior cut surface defining cutting paths that converge proximally towards each other.