Patent ID: 8118811

Claim:
An extramedullary tibial cut guide assembly for cutting a proximal end of a tibia having a proximal end, a distal end, a tibial shaft, a tibial axis along the shaft, an anterior side parallel to a frontal plane, a medial side parallel to a sagittal plane, and a lateral side parallel to said sagittal plane, the tibial cut guide assembly comprising: a support having a longitudinal support axis, the support axis positionable parallel to the sagittal plane when the support is mounted to a tibia; a cross member mounted on the support, the cross member having a cross member axis perpendicular to the support axis, the cross member axis and support axis defining a guide plane that is positionable perpendicular to the sagittal plane when the support is mounted to the tibia, the cross member having a slope reference oriented at a predetermined slope angle relative to the guide plane; a cut guide having a posterior face and an opposing anterior face, the cut guide comprising: a cross member engaging end mounted on the cross member in engagement with the slope reference, such that the posterior face of the cut guide faces away from the longitudinal support axis to define a cutter path that is oriented obliquely to the guide plane, the cutter path also oriented obliquely to the sagittal plane when the support is mounted on the tibia whereby the cutter path defines one of an anterior-medial approach and an anterior-lateral approach to the tibia; and a cutter guide having a cut slot surface defining a cut plane, the cut slot surface extending between the posterior face and the anterior face, the cutter guide oriented at a predetermined slope angle relative to the guide plane as determined by the slope reference, such that the guide plane does not intersect the cut slot surface.