Patient-matched total knee arthroscopy
A gauge assembly includes a distal femur gauge including medial and lateral condyle paddles each having a shape and size corresponding to a pre-operative planned distal resection of a patient's femur, and a tibial cutting block connected to the distal femur gauge. The condyle paddles include features, for example, pin-receiving holes, that permit intra-operative anterior-posterior and/or internal-external adjustment of the position of the distal femur gauge. The tibial cutting block includes features, for example, pin-receiving slot and holes, that permit fixing of the varus-valgus and flexion-extension degrees of freedom prior to fixing the internal-external and medial-lateral degrees of freedom.
1. A distal femur gauge, comprising:
a medial condyle paddle;
a lateral condyle paddle connected to the medial condyle paddle, each condyle paddle having a shape and size corresponding to a patient's resected femur based on a pre-operatively planned distal resection of the patient's femur; and
a bridge that adjoins the medial condyle paddle and the lateral condyle paddle, the bridge including at least one protuberance;
wherein the lateral and medial condyle paddles each have a proximal facing surface that is flat and configured to conform to a distal end of the patient's femur after the distal resection of the patient's femur; and
wherein the lateral and medial condyle paddles each further comprise a distal facing surface, the distal facing surface of the lateral condyle paddle being contoured to replicate the patient's native lateral condyle, the distal facing surface of the medial condyle paddle being contoured to replicate the patient's native medial condyle.
2. The distal femur gauge of claim 1 wherein the lateral and medial condyle paddles are each replicas of the resected femur based on preoperatively planned condyle resections.
3. The distal femur gauge of claim 1 wherein the lateral and medial condyle paddles are shaped and sized to aid in correcting a limb mal-alignment.
4. The distal femur gauge of claim 1 wherein the lateral and medial condyle paddles include features that permit intra-operative anterior-posterior and/or internal-external adjustment of the position of the distal femur gauge.
5. The distal femur gauge of claim 1 , further comprising a pin positioned on, and outwardly extending from, the distal facing surface of each of the lateral condyle paddle and the medial condyle paddle, and wherein the pin is located at a position at which the pin can be inserted into a prepared hole in the distal end of the patient's femur after the distal resection of the patient's femur.
6. The distal femur gauge of claim 5 , wherein each of the lateral condyle paddle and the medial condyle paddle includes at least one pin hole that extends through both the proximal facing surface and the distal facing surface.
7. The distal femur gauge of claim 6 , wherein the at least one pin hole of the medial condyle paddle includes at least an elongated slot.
8. The distal femur gauge of claim 6 , wherein the at least one pin hole of each of the lateral condyle paddle and the medial condyle paddle comprises a first pin hole and a second pin hole, wherein the first pin hole is positioned to facilitate adjustment of an anterior-posterior positon of the distal femur guide, and wherein the second pin hole is positioned to facilitate adjustment of an internal-external rotation of the distal femur guide.
9. The distal femur gauge of claim 6 , wherein the at least one protuberance is positioned on the bridge at a location that corresponds to a location of a neutral extension rotation of the patient's femur relative to the patient's tibia.
10. The distal femur gauge of claim 6 , wherein the at least one protuberance is shaped and positioned to provide a hyperextension stop.
11. The distal femur gauge of claim 10 , wherein the at least one protuberance is removable from the bridge.