Apparatus for preoperative planning of artificial knee joint replacement operation and jig for supporting operation

Abstract

Steps S 101 and S 102 of displaying images which input two-dimensional tomographic images of the lower limb including the knee joint and displays three-dimensional images of the femur and the tibia including the knee joint from the image input, steps S 103 to S 105 and S 106 to S 108 of determining artificial joint which determine the artificial joint to be replaced from the three-dimensional images of each knee joint of the femur and tibia, and steps S 113 and S 114 of parameter determination which determine various parameters used in an artificial knee joint replacement operation using an alignment rod in the marrow to be inserted into the femur based on the artificial joint and reference points of the knee joint determined in steps S 103 to S 105 of determining femur side artificial joint are performed by a computer.

1 - 3 . (canceled) 
     
     
         4 . A jig for an artificial knee joint replacement operation, comprising:
 a contact portion which contacts the reference points of the knee joint of the femur; a mounting portion which mounts the alignment rod in the marrow to be inserted into the marrow of the femur; and an arm portion which connects the contact portion with the mounting portion and can adjust the attaching position and angle of the mounting portion.   
     
     
         5 . A jig for an artificial knee joint replacement operation, comprising: a contact portion which contacts the reference points of the knee joint of the femur; a mounting portion which mounts the alignment rod in the marrow to be inserted into the marrow of the femur; and a connection portion which connects the contact portion with the mounting portion and can adjust the attaching angle of an external jig which is mounted on the alignment rod in the marrow. 
     
     
         6 . The jig for an artificial knee joint replacement operation according to  claim 4 , wherein the reference points of the femur is the posterior condylar tangent. 
     
     
         7 . The jig for an artificial knee joint replacement operation according to  claim 4 , wherein the reference points of the femur is a tangent of two points in the bimodal portion of the cortex of cross-sectional images of the bone in the proximal part from the proximal edge of the patellofemoral joint on the flat surface nearly perpendicular to an axis of the alignment rod in the marrow and the arm portion or the connection portion can be adjusted corresponding to an offset distance between the axial position of the alignment rod in the marrow and the tangent. 
     
     
         8 . The jig for an artificial knee joint replacement operation according to  claim 5 , wherein the reference points of the femur is the posterior condylar tangent. 
     
     
         9 . The jig for an artificial knee joint replacement operation according to  claim 5 , wherein the reference points of the femur is a tangent of two points in the bimodal portion of the cortex of cross-sectional images of the bone in the proximal part from the proximal edge of the patellofemoral joint on the flat surface nearly perpendicular to an axis of the alignment rod in the marrow and the arm portion or the connection portion can be adjusted corresponding to an offset distance between the axial position of the alignment rod in the marrow and the tangent.