Instruments for knee placement

Abstract

There are provided various embodiments of medical instruments to perform knee surgery. In one embodiment a finned platform for mounting a cutting block is provided. The finned platform can be used on either a femur or tibia to allow for the proper cuts when performing a knee surgery. In another embodiment, a tibial trial is shown having a fin. The fin is useful to reinforce the bone to reduce the risk of fracture during bone preparation. In another embodiment, a reamer is provided having a plurality of cutting flutes. It may be desirable to utilize a guide with the reamer to allow the reamer to cut a non-circular portion of the tibial bone. In yet another embodiment, a plurality of fixation pegs are provided on the tibial implant to allow for easy removal of such implant if a revision surgery becomes necessary.

1 . A platform that supports a medical device, comprising:
 a head having a substantially planar upper support surface;   a shaft depending from the head; and   a fin laterally extending from the shaft for gripping a bone segment such that upon insertion of the shaft and fin into the bone segment, the substantially planar upper support surface of the head is contiguous with a corresponding surface of the medical device to thereby support the medical device on the platform.   
     
     
         2 . The platform according to  claim 1 , wherein the fin is in the form of a continuous thread extending about the shaft. 
     
     
         3 . The platform according to  claim 1 , wherein the fin is in the form of a plurality of ribs extending about the shaft. 
     
     
         4 . The platform according to  claim 1 , wherein the fin is in the form of a plurality of longitudinally extending ribs extending along the shaft. 
     
     
         5 . The platform according to  claim 1 , wherein the bone segment is the distal portion of the femur adjacent the knee joint. 
     
     
         6 . The platform according to  claim 1 , wherein the bone segment is the proximal portion of the tibia adjacent the knee joint. 
     
     
         7 . The platform according to  claim 1 , wherein the medical device is a bone cutting block. 
     
     
         8 . The platform according to  claim 1 , wherein the medical device is an orthopedic knee implant. 
     
     
         9 . The platform according to  claim 1 , wherein the head defines a depression or opening that receives a spike or projection depending from the medical device to thereby engage the medical device with the head. 
     
     
         10 . The platform according to  claim 1 , wherein the fins has a greater lateral surface relative to a thickness of the fin to adequately engage the relatively soft, spongy bone segment. 
     
     
         11 . The platform according to  claim 1 , wherein the platform is made of a metal material. 
     
     
         12 . The platform according to  claim 1 , wherein the platform is made of a polymer material. 
     
     
         13 . The platform according to  claim 1 , wherein the platform is made of a resorbable material. 
     
     
         14 . The platform according to  claim 7 , wherein the platform is removable from the bone segment alter use with the bone cutting block. 
     
     
         15 . The platform according to  claim 8 , wherein the platform is permanently maintained in the bone segment to support the orthopedic knee implant. 
     
     
         16 . A platform that supports a medical device, comprising:
 a platform including a head having a substantially planar upper support surface, a shaft projecting axially from the head, and at least one fin extending laterally from the shaft and configured for gripping a bone segment; and   wherein the medical device is supported by the platform with the upper support surface of the head contiguously engaged with a corresponding surface of the medical device.   
     
     
         17 . The platform according to  claim 16 , wherein the fin comprises a thread extending about the shaft. 
     
     
         18 . The platform according to  claim 16 , wherein the fin comprises at least one rib extending longitudinally along a length of the shaft. 
     
     
         19 . The platform according to  claim 16 , wherein the head defines a depression or opening that receives a tip portion of the medical de vice to thereby engage the medical device with the head. 
     
     
         20 . The platform according to  claim 16 , wherein the shaft comprises a peg projecting axially from the head, the peg having a solid inner core portion and a porous outer portion positioned about the solid inner core portion. 
     
     
         21 . The platform according to  claim 20 , wherein the porous outer portion comprises a porous cap positioned over the solid inner core portion. 
     
     
         22 . The platform according to  claim 20 , wherein the solid inner core portion has a non-circular shape that defines a plurality of thin portions to facilitate cutting of the inner core portion. 
     
     
         23 . The platform according to  claim 16 , wherein the medical device comprises a cutting guide engaged with the head of the platform. 
     
     
         24 . The platform according to  claim 16 , wherein the medical device comprises an orthopedic knee implant engaged with the head of the platform. 
     
     
         25 . The platform according to  claim 16 , wherein the medical device comprises a cutting instrument engaged with the head of the platform and configured to cut bone. 
     
     
         26 . The platform according to  claim 25 , wherein the cutting instrument comprises a reamer having one or more cutting flutes. 
     
     
         27 . A platform that supports a medical device, comprising:
 a platform having a substantially planar upper support surface and an opposite lower bone engagement surface, the lower bone engagement surface including a plurality of teeth extending therefrom and configured for embedment in underlying bone; and   wherein the medical device is supported by the platform with the upper support surface of the platform contiguously engaged with a corresponding surface of the medical device.   
     
     
         28 . The platform according to  claim 27 , wherein the rasp platform includes a central platform portion movably positioned between a pair of outer platform portions; and
 wherein an impaction force imparted to the central platform portion forces the outer platform portions in an outward direction away from the central platform portion to cut and smooth the underlying bone with the plurality of teeth extending from the lower bone engagement surface.   
     
     
         29 . The platform according to  claim 28 , wherein the central platform portion is movably interconnected with the pair of outer platform portions. 
     
     
         30 . The platform according to  claim 27 , further comprising an impactor engaged with the substantially planar upper support surface and structured to impart an impaction force on the platform to embed the plurality of teeth in the bone.