Patent ID: 8430932

Claim:
A total knee arthroplasty system for use in a total knee arthroplasty procedure, comprising; a first cutting guide including at least one planar guide surface adapted for guiding an oscillating saw blade to cut a distal femur of a patient; an alignment guide that operably determines alignment of the first cutting guide, the alignment guide including a body adapted to be positioned on the femur to simultaneously contact an articular surface of a non-resected medial condyle, an articular surface of a non-resected lateral condyle and an anterior cortex of the femur, wherein the alignment guide provides for markings to be made in the femur that are subsequently referenced by the first cutting guide after removal of the alignment guide from the femur to dictate a location and orientation of the first cutting guide for creating at least one resected surface on the femur; and a femoral prosthetic implant adapted to be implanted on the at least one resected surface, 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 having a fixation profile 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 femoral 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 femoral implant and the femur, and wherein: the anterior contact surface has a profile when viewed in a mediolateral direction defining an anterior fixation path that is configured to diverge proximally away from a 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 towards 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 towards the long axis of the femur; and 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.