Apparatus for use in arthroplasty of the knees

A cutter for removing bone from the femur of a knee joint and which is adapted for being rotatably mounted on a cutting device for being inserted into the knee joint between the femur and the tibia for the removal of the bone from the femur by the cutter in a path of travel of the tibia as the tibia is moved through at least a partial range of motion about the femur between flexed and extended positions.

A cutter for removing bone from the femur of a knee joint and which is adapted for being rotatably mounted on a cutter device for insertion into the knee joint between the femur and the tibia, comprising;

• a) one or more blades for resecting bone from the femur to a desired depth along a path of travel of the tibia with movement of the tibia through at least a partial range of motion bout the femur between flexed and extended positions;
• and
• b) a further blade for simultaneously cutting a channel into the femur to a greater depth along the path of travel.

A tibial instrument for being secured in position in a knee joint on a resected surface of a condyle of the tibia for evaluating movement of the tibia about the femur through at least a partial range of motion between flexed and extended positions prior to removal of the tibial instrument for allowing a corresponding tibial prosthesis to be mounted on the tibia in said position, wherein the tibial instrument is adapted for locating a cutter device in a desired orientation relative to the femur for guiding resection of the femur to a desired depth with travel of the tibia about the femur between the flexed and extended positions.