Guide assembly for guiding cuts to a femur and tibia during a knee arthroplasty

An assembly for guiding resection of a femur and tibia of a knee joint in preparation for installation of a femoral and tibial knee components, said assembly comprising:

• a femoral IM rod configured to extend within a medullary canal of the femur and a tibial IM rod configured to extend within a medullary canal of the tibia;
• at least one mount secured to one of the femoral or tibial IM rods;
• at least one cutting guide configured to guide cuts to at least one of the femur or the tibia in preparation for attachment of the knee components;
• and
• an outrigger frame having at least one arm with a first end and a second end, the first end of the arm configured to connect to the mount so that the arm extends generally anteriorly out of an opening defined in soft tissues surrounding the knee joint and the second end of the arm configured to support the cutting guide.

An assembly for guiding resection of a femur and tibia of a knee joint in preparation for installation of a femoral and tibial knee components, said assembly comprising:

• a femoral intramedullary rod configured to extend within a medullary canal of the femur and a tibial intramedullary rod configured to extend within a medullary canal of the tibia;
• a femoral mount configured to connect to a distal end of the femoral intramedullary rod and defining an opening extending anteriorly and posteriorly through the femoral mount;
• a tibial angulation guide configured to connect to a proximal end of the tibial intramedullary rod, extend around at least a portion of the femoral mount and register an angle between the tibia and the femur;
• a flexion position cutting guide configured to guide cuts to at least one of the femur or the tibia while the knee is in flexion in preparation for attachment of the knee components, said flexion position cutting guide defining an attachment opening;
• an outrigger frame having a first and a second arm connected by a base member, wherein the first arm of the outrigger frame includes a first locking mechanism configured to extend through the anterior-posterior opening defined in the femoral mount and lock the outrigger frame thereto when the knee joint is in flexion, wherein the base member extends generally anteriorly out of an opening defined in soft tissues surrounding the knee joint and wherein the second arm extends perpendicular to the base member and parallel to the first arm and is configured to extend through the attachment opening of the extension position cutting guide to provide support therefore;
• an extension position cutting guide configured to guide cuts to at least one of the femur or the tibia while the knee is in extension in preparation for attachment of the knee components, said extension position cutting guide defining an attachment opening;
• and
• a second locking mechanism configured to extend posteriorly through the attachment opening of the flexion position cutting guide and the anterior-posterior opening defined in the femoral mount and to lock the flexion position cutting guide to the femoral mount.