Abstract: The invention concerns a prosthesis (1) comprising a femoral implant (2) and a tibial implant (3) equipped with anchoring rods (21), each anchoring rod (21) not being integral with the corresponding implant and capable of being connected thereto, the prosthesis (1) including therefor means (16, 20; 36, 34) for assembling each anchoring rod (21) to the corresponding implant (2, 3). The invention is characterized in that the means (16, 20; 36, 34) for assembling each medullar anchoring rod (21) to the corresponding implant (2, 3) are configured to allow a plurality of possible angular positions of that same anchoring rod (21) relative to the implant (2, 3) in translation along an axis inscribed in the frontal plane, that is lateral, or in the sagittal plane, that is antero-posterior, of the implant.

Abstract: A computer assisted orthopedic surgery system for ligament graft reconstruction includes a system for obtaining data indicative of a location for ligament graft placement with respect to at least a first bone and a second bone. The system includes a position determining device that is capable of tracking the relative movements of the first and second bones using reference bodies that are attached to the first and second bones and a pointer that has a tip for contacting a surface of at least one of the first and second bones to capture one or more reference points. The system further includes a computer that is configured to determine and track intraoperative positions of the reference bodies and the pointer and to provide isometric and impingement data for a ligament graft placement based on a realistic simulation of a trajectory of a deformable ligament graft.