Instruments for minimally invasive surgery total knee arthroplasty

A surgical instrument kit for making femoral resections for seating a femoral implant on a distal femur, the instruments configured for orientation relative to an intramedullary rod extending from an intramedullary canal of the femur, comprising:

• a medial distal cut guide having a cut guide portion, said cut guide portion having a medial distal cut slot therein for use in resecting a medial distal condyle of the femur, said medial distal cut guide supported by a medial distal cut paddle, said medial distal cut paddle configured to mount on the intramedullary rod, said medial distal cut paddle and said medial distal cut guide configured to orient said medial distal cut slot substantially along an anterior-medial slope of the medial distal condyle when said medial distal cut paddle is mounted on the intramedullary rod to thereby define an anterior-medial approach for making a medial distal resection of the medial distal condyle, and an anterior-posterior positioning caliper configured for use in transferring a reference point from the intramedullary rod to a resected surface of the medial distal condyle, wherein said anterior-posterior positioning caliper comprises a retaining arm configured to mount on the intramedullary rod, a reference bar slidingly engaged to the retaining arm in a substantially anterior-posterior dimension, said reference bar including a drill guide configured for use in forming an a secondary reference point on a resected surface of the medial distal condyle, and an anterior stylus on said reference bar, a proximal end of said anterior stylus configured to contact a selected anterior region of the femur to thereby assist in positioning said drill guide at the secondary reference point.