Patient-specific instrumentation for implant revision surgery

Abstract

A system for generating a PSI jig model for implant revision comprises a reference anchor surface identifying module to identify at least one reference anchor surface from at least one patient specific image of a bone and of an implanted implant, the reference anchor surface configured to receive a guide reference(s). An implant abutment surface determining module determines an implant abutment surface from the patient specific bone image. A PSI reference jig model generator module generates and outputs a reference jig model using the identified reference anchor surface and the determined implant abutment surface, the reference jig model comprising contact surface(s) corresponding to the determined implant abutment surface for complementary connection with the determined implant abutment surface, guide interfacing portion(s) configured to guide a planting of the guide reference in the reference anchor surface, and a patient-specific geometry between contact surface(s) and the guide interfacing portion, so as to position and/or orient the guide interfacing portion relative to the reference anchor surface, for subsequently planting the guide reference(s) in the reference anchor surface as identified when the contact surface(s) is complementarily connected with the determined implant abutment surface. A method for creating patient-specific instrumentation jig for implant revision is also provided.

1 . A system for implant revision surgery comprising a reference jig having a body having at least one contact surface corresponding to an implant abutment surface of an implanted implant for complementary connection with the implant abutment surface, a patient specific contact surface being a negative contour matching a surface of a bone for unique complementary contact of the patient specific contact surface with the bone, at least one guide interfacing portion configured to guide a planting of at least one guide reference in a reference anchor surface of a bone, and a patient-specific geometry between the at least one contact surface and the at least one guide interfacing portion, so as to position and/or orient the at least one guide interfacing portion relative to the reference anchor surface. 
     
     
         2 . The system according to  claim 1 , wherein the at least one guide reference is a pair of guide pins. 
     
     
         3 . The system according to  claim 1 , wherein the contact surface corresponding to an implant abutment surface is shaped as a negative of a tibial plateau portion of an implant. 
     
     
         4 . The system according to  claim 3 , wherein the at least one guide interfacing portion is configured to be opposite a medial epiphyseal bone and/or the anterior cortex from a femur. 
     
     
         5 . The system according to  claim 1 , wherein the contact surface corresponding to an implant abutment surface is shaped as a negative of a distal of a femoral implant. 
     
     
         6 . The system according to  claim 5 , wherein the at least one guide interfacing portion is configured to be opposite one of the medial aspect, the lateral aspect and the superior tubercle from a tibia. 
     
     
         7 . A system for implant revision surgery comprising:
 a reference jig having a body having at least one contact surface corresponding to an implant abutment surface of an implanted implant for complementary connection with the implant abutment surface, at least one guide interfacing portion configured to guide a planting of at least one guide reference in a reference anchor surface of a bone, and a patient-specific geometry between the at least one contact surface and the at least one guide interfacing portion, so as to position and/or orient the at least one guide interfacing portion relative to the at least one reference anchor surface; and   a revision jig including at least another guide interfacing portion for engagement with the at least one guide reference, at least one tool interface portion positioned and/or oriented relative to the guide reference, the at least one tool interface portion adapted to be interfaced with a tool altering the bone to perform cuts for subsequently installing a replacement implant.   
     
     
         8 . The system according to  claim 7 , wherein the reference jig has a patient specific contact surface being a negative contour matching a surface of a bone for unique complementary contact of the patient specific contact surface with the bone. 
     
     
         9 . The system according to  claim 7 , wherein the at least one guide reference is a pair of guide pins. 
     
     
         10 . The system according to  claim 7 , wherein the contact surface corresponding to an implant abutment surface is shaped as a negative of a distal of a femoral implant. 
     
     
         11 . The system according to  claim 10 , wherein the at least one guide interfacing portion is configured to be opposite a medial epiphyseal bone and/or the anterior cortex from a femur. 
     
     
         12 . The system according to  claim 7 , wherein the contact surface corresponding to an implant abutment surface is shaped as a negative of a tibial plateau portion of an implant. 
     
     
         13 . The system according to  claim 12 , wherein the at least one guide interfacing portion is configured to be opposite one of the medial aspect, the lateral aspect and the superior tubercle from a tibia. 
     
     
         14 . The system according to  claim 7 , wherein the revision jig is a stock component. 
     
     
         15 . The system according to  claim 7 , wherein the revision jig has at least one patient-specific geometry between the guide interfacing portion and the at least one tool interface portion