Femoral reaming system and method of performing trial reduction

Abstract

An apparatus ( 10 ) for removing bone material comprises a distal cutting instrument ( 12 ) and a proximal cutting instrument ( 14 ). The distal cutting instrument has at least one first cutting edge ( 30 ), a shoulder ( 20 ), and a shaft portion ( 22 ). The shaft portion ( 22 ) has an anti-rotation feature. The at least one first cutting edge ( 30 ) removes bone material when moved in a first direction. The proximal cutting instrument ( 14 ) is removably attached to the shaft portion ( 22 ). The proximal cutting instrument ( 14 ) has a first end portion ( 68 ) and a second end portion ( 66 ). The second end portion ( 66 ) contacts the shoulder ( 20 ) of the distal reamer ( 12 ) when the proximal reamer is mounted to the shaft portion ( 22 ). The proximal reamer ( 14 ) has at least one second cutting edge ( 32 ) and an aperture. The aperture is adapted to receive the anti-rotation feature of the shaft portion ( 22 ) of the distal reamer ( 12 ). The at least one second cutting edge ( 32 ) removes bone material when moved in a second direction.

1 . A system for removing bone material, the system comprising:
 a. a distal cutting instrument, the distal cutting instrument having at least one first cutting edge, a shoulder, and a shaft portion, the shaft portion having an anti-rotation feature, and wherein the at least one first cutting edge removes bone material when moved in a first direction; and   b. a proximal cutting instrument removably attached to the shaft portion, the proximal cutting instrument having a first end portion and a second end portion, the second end portion contacting the shoulder of the distal reamer when the proximal reamer is mounted to the shaft portion, the proximal reamer having at least one second cutting edge and an aperture, the aperture adapted to receive the anti-rotation feature, and wherein the at least one second cutting edge removes bone material when moved in a second direction.   
     
     
         2 . The system of  claim 1 , wherein the at least one first cutting edge is a right-hand cutting flute, and the at least one second cutting edge is a left-hand cutting flute. 
     
     
         3 . The system of  claim 1 , further comprising a quick connect assembly, the quick connect assembly mountable to the shaft portion and adapted to contact the first end portion. 
     
     
         4 . The system of  claim 3 , wherein the quick connect assembly further comprises a depth guide reference. 
     
     
         5 . The system of  claim 1 , further comprising a trial neck mountable to the shaft portion and adapted to contact the first end portion. 
     
     
         6 . The system of  claim 1 , further comprising a trial neck mountable to the distal cutting instrument. 
     
     
         7 . The system of  claim 1 , further comprising a trial neck mountable to the proximal cutting instrument. 
     
     
         8 . The system of  claim 1 , wherein the proximal cutting instrument has a slot that extends an entire length of the proximal cutting instrument. 
     
     
         9 . The system of  claim 1 , wherein the anti-rotation feature comprises a square cross-section. 
     
     
         10 . The system of  claim 1 , wherein the trial neck further comprises a modular portion, the modular portion configured to be received within the trial neck. 
     
     
         11 . The system of  claim 1 , wherein the modular portion is further configured to have a tapered portion, the tapered portion allowing for adjustment of the neck axis of the trial neck. 
     
     
         12 . The system of  claim 1 , wherein the first cutting instrument comprises a broach. 
     
     
         13 . The system of  claim 12 , further comprising an insertion tool configured to attach the trial neck to the cutting instruments. 
     
     
         14 . The system of  claim 12 , wherein the trial neck and the first end portion of the proximal cutting instrument are further configured having a circumferential pattern of ridges and valleys such that the ridges of the pattern on the trial neck is configured to mate to the valleys of the pattern on the first end portion of the proximal cutting surface. 
     
     
         15 . The system of  claim 14 , wherein the insertion tool is further configured to rotate the trial neck relative to the distal and proximal cutting instruments. 
     
     
         16 . A method for preparing a femoral canal, comprising the steps of:
 a. moving a first cutting instrument in a first direction thereby cutting a first portion of bone;   b. attaching a second cutting instrument to the first cutting instrument; and   c. moving the first and second cutting instruments in a second direction different than the first direction thereby cutting a second portion of bone.   
     
     
         17 . The method of  claim 16 , wherein the first and second directions are clockwise and counterclockwise rotation. 
     
     
         18 . The method of  claim 16 , wherein the first and second cutting instruments do not cut the first portion of bone when the first and second cutting instruments are moved in the second direction. 
     
     
         19 . The method of  claim 16 , further comprising the step of attaching a trial instrument to at least one of the first and second cutting instruments. 
     
     
         20 . The method of  claim 19 , further comprising the steps of:
 rotating the trialing instrument relative to at least one of the first and second cutting instruments; and   fixing the trialing instrument to at least one of the first and second cutting instruments.