Instruments For Minimally Invasive Surgery Total Knee Arthroplasty

Abstract

A surgical instrument for making femoral resections for seating a femoral implant on a distal femur, the instrument configured for orientation relative to an intramedullary rod. The instrument includes a medial distal cut guide having a cut guide portion, the cut guide portion having a cut slot therein for use in resecting a medial distal condyle of the femur. A medial distal cut paddle supports the medial distal cut guide. The medial distal cut paddle is configured to mount on the intramedullary rod to orient the medial distal cut slot substantially along an anterior-medial slope of the medial distal condyle when the 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.

What is claimed is: 
     
         1 . A surgical instrument for making femoral resections for seating a femoral implant on a distal femur, the instrument 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 cut slot therein for use in resecting a medial distal condyle of the femur,   a medial distal cut paddle supporting said medial distal cut guide, 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.   
     
     
         2 . The instrument of  claim 1 , wherein said cut guide has a curved profile, said curved profile generally tracking the anterior-medial slope of the medial distal condyle. 
     
     
         3 . The instrument of  claim 1 , wherein said distal medial cut guide has a stem portion, said stem portion including an offset portion, said medial distal cut paddle including a platform, said platform having a distal medial cut guide bore configured to closely receive the stem portion of the medial distal cut guide in a sliding engagement to thereby allow for selective positioning of the cut guide portion relative to the distal end of the femur, and said stem portion of said distal medial cut guide disposed in said distal medial cut guide bore of said platform such that said medial distal cut guide is offset proximally from said platform via said offset portion of said stem portion. 
     
     
         4 . The instrument of  claim 3 , wherein said platform has a flat profile on at least a proximal side thereof for positioning said platform against the medial distal condyle prior to resection of the medial distal condyle. 
     
     
         5 . The instrument of  claim 1 , further comprising said medial distal cut guide having one or more fixation bores on a proximal side of the cut guide portion for use in fixing the cut guide portion on the femur. 
     
     
         6 . The instrument of  claim 1 , wherein cut guide portion of said medial distal cut guide is slidingly engaged to said stem to thereby allow selective positioning of said cut slot along a range of anterior-medial approaches, and a means for selectively locking said cut guide portion on said stem. 
     
     
         7 . The instrument of  claim 1 , wherein said medial distal cut guide is universal.