Hip stem centralizer datum guide and method

Abstract

A hip stem centralizer datum guide ( 40, 100, 200, 300 ) and method are provided for positioning a proximal portion of a hip stem component ( 44 ) within bone cement in an intramedullary canal of a femur. The datum guide is positionable in a predetermined position relative to the intramedullary canal and is able to create a datum ( 70, 72, 74, 76, 120, 220, 302 ) that records the predetermined hip stem component position relative to the intramedullary canal. The datum is able to be referenced to position the hip stem component in the predetermined hip stem component position in the bone cement in the intramedullary canal.

1 . In combination, a datum guide for establishing a datum on an anatomical structure and a reference locator for referencing the datum, comprising:
 a datum guide including at least one guide element for creating the datum on the anatomical structure; and   a reference locator including at least one alignment reference element for aligning with the datum.   
   
   
       2 . The combination of  claim 1 , wherein the datum guide comprises a rasp including a plurality of reference marks. 
   
   
       3 . The combination of  claim 1 , wherein the reference locator comprises a stem component of a prosthesis including a plurality of alignment reference marks. 
   
   
       4 . The combination of  claim 1 , wherein the datum guide comprises a guide including a guide portion. 
   
   
       5 . The combination of  claim 4 , wherein the guide portion includes a cut slot. 
   
   
       6 . The combination of  claim 4 , wherein the guide portion includes at least one drill guide. 
   
   
       7 . The combination of  claim 1 , wherein the reference locator comprises a prosthesis inserter instrument including a protruding tab. 
   
   
       8 . The combination of  claim 1 , wherein the reference locator comprises a prosthesis inserter instrument including at least one pin. 
   
   
       9 . The combination of  claim 8 , wherein the at least one pin is integrally formed with the prosthesis inserter instrument. 
   
   
       10 . The combination of  claim 8 , wherein the at least one pin is separately formed with respect to the prosthesis inserter instrument. 
   
   
       11 . The combination of  claim 8 , wherein the prosthesis inserter instrument further includes a sleeve including at least one pin.