Patient matched instrument

Abstract

A patient matched instrument for a patient's femur is disclosed. The instrument includes a body having a cutting slot and a patient matched surface that mates with the patient's trochlear groove, a first leg portion extending from the body, a second leg portion extending from the body; and each leg portion has a contacting pad for tangential contact with the patient's femoral medial and lateral condyles.

1 - 21 . (canceled) 
     
     
         22 . A patient matched instrument for a patient's femur having a trochlear groove, a medial condyle, and a lateral condyle, the instrument comprising:
 a body having a cutting slot and a patient matched surface that mates with and contacts the patient's trochlear groove;   a first leg portion extending from the body and having a first contacting pad for tangential contact with the patient's femoral medial condyle; and   a second leg portion extending from the body and having a second contacting pad for tangential contact with the patient's femoral lateral condyle.   
     
     
         23 . The instrument of  claim 22 , the body further comprising a visual indicator. 
     
     
         24 . The instrument of  claim 22 , the body further comprising a window. 
     
     
         25 . The instrument of  claim 22 , the body further comprising apertures. 
     
     
         26 . The instrument of  claim 22 , wherein each leg portion further comprises at least one pin boss. 
     
     
         27 . The instrument of  claim 22 , further comprising a guide. 
     
     
         28 . The instrument of  claim 22 , wherein the patient matched surface of the body has six boundary conditions. 
     
     
         29 . The instrument of  claim 22 , wherein the first leg portion has a different length from the second leg portion. 
     
     
         30 . The instrument of  claim 22 , wherein each of the first and second contacting pads is substantially perpendicular to a mechanical axis of the patient's femur. 
     
     
         31 . The instrument of  claim 22 , wherein each of the first and second contacting pads is parallel to the cutting slot. 
     
     
         32 . The instrument of  claim 22 , wherein the first contacting pad contacts the femoral medial condyle at an angle relative to the cutting slot and/or the mechanical axis. 
     
     
         33 . The instrument of  claim 22 , wherein the second contacting pad contacts the femoral lateral condyle at an angle relative to the cutting slot and/or the mechanical axis. 
     
     
         34 . The instrument of  claim 22 , the body further comprising a passage. 
     
     
         35 . The instrument of  claim 22 , wherein the body includes at least one cross-member. 
     
     
         36 . The instrument of  claim 22 , wherein the body comprises an anterior ridge extension. 
     
     
         37 . The instrument of  claim 22 , further comprising at least one surface contact confirmation slot. 
     
     
         38 . The instrument of  claim 22 , further comprising a distal trochlea grip. 
     
     
         39 . The instrument of  claim 22 , wherein each leg portion includes at least one paddle. 
     
     
         40 . The instrument of  claim 22 , wherein the body further comprises a frangible component. 
     
     
         41 . The instrument of  claim 40 , wherein the frangible component is a leg portion. 
     
     
         42 . The instrument of  claim 22 , wherein the body further comprises at least one fixation hole. 
     
     
         43 . The instrument of  claim 42 , wherein the at least one fixation hole is aligned to a normal of a surface that the at least one fixation hole intersects. 
     
     
         44 . A patient matched instrument for a patient's femur having a trochlear groove, a medial condyle, and a lateral condyle, the instrument comprising:
 a body having a cutting slot and a patient matched surface that mates with the patient's trochlear groove;   a first leg portion extending from the body and having a first contacting pad for tangential contact with a distal portion of the patient's femoral medial condyle; and   a second leg portion extending from the body and having a second contacting pad for tangential contact with a distal portion of the patient's femoral lateral condyle.   
     
     
         45 . The instrument of  claim 44 , wherein the patient matched surface mates with the patient's trochlear groove.