Femoral neck resection jig
The invention provides a surgical apparatus for performing a controlled resection of the neck of a femur during a hip replacement procedure, the surgical apparatus comprising: a body portion. The body portion comprises a frame that is mountable on a femoral head of the femur to position the body portion with respect to a centre of the femoral head. The body portion also includes a resection guide for indicating a position of a resection plane on the femoral neck, and an arm extending from the frame and including markings for reading off a femoral head offset. The apparatus also includes a connector for mounting the body portion on an intramedullary rod located in an intramedullary canal of the femur, and for slidably receiving the arm. The connector includes a pointer. The femoral head offset is indicated by reading the position of the pointer relative to the markings on the arm.
1 . A method for performing a controlled resection of the neck of a femur during a hip replacement procedure using a surgical apparatus comprising:
a body portion comprising:
a frame comprising an aperture, wherein the aperture is dimensioned for receiving a femoral head of the femur to position the body portion with respect to a center of the femoral head;
a resection guide for indicating a position of a resection plane on the femoral neck, and
an arm extending from the frame and including markings for reading off a femoral head offset,
a connector for mounting the body portion on an intramedullary rod located in an intramedullary canal of the femur, and for slidably receiving the arm and wherein the connector includes a pointer, the femoral head offset being indicated by reading the position of the pointer relative to the markings on the arm,
mounting the connector on the intramedullary nail;
assembling the connector with the arm;
mounting the frame on the femoral head by slidably adjusting the arm relative to the connector;
measuring the femoral head offset by determining the location of the pointer with respect to the markings on the arm, and
using the resection guide to either:
mark the position of the resection plane on the neck of the femur; or
guide a blade of a cutting device to resect the neck of the femur.
2 . The method of claim 1 , wherein the method further comprises: removably mounting a frame on a posterior aspect of the femoral head.
3 . The method of claim 1 , wherein the method further comprises: removably mounting a frame on an anterior aspect of the femoral head.
4 . The method of claim 3 , wherein the connector includes a slot configured for slidable receipt of the arm, and wherein assembling the connector with the arm includes inserting the arm into said slot.
5 . The method of claim 4 , wherein the frame includes a pin hole configured for removable receipt of a bone pin for removably mounting the frame on the femoral head, and wherein mounting the frame on the femoral head includes inserting a bone pin through the pin hole.
6 . The method of claim 2 , wherein the connector includes a slot configured for slidable receipt of the arm, and wherein assembling the connector with the arm includes inserting the arm into said slot.
7 . The method of claim 6 , wherein the frame includes a pin hole configured for removable receipt of a bone pin for removably mounting the frame on the femoral head, and wherein mounting the frame on the femoral head includes inserting a bone pin through the pin hole.