Version-replicating instrument and orthopaedic surgical procedure for using the same to implant a revision hip prosthesis
A modular femoral prosthesis for use during performance of a hip revision procedure includes a proximal body component, a distal stem component, and a locking bolt. Surgical instruments and methods for use in implanting such a modular femoral prosthesis are disclosed.
1. A method of performing a surgical procedure to implant an orthopaedic hip prosthesis, comprising:
implanting a distal stem component into an intramedullary canal of a patient's femur,
installing a proximal trial instrument to the proximal end of the implanted distal stem component,
rotating the proximal trial instrument relative to the implanted distal stem component so as to position the proximal trial instrument in a selected version,
locking the proximal trial instrument in the selected version,
uninstalling the proximal trial instrument from the implanted distal stem component with the proximal trial instrument locked in the selected version,
installing a version-replicating instrument to the proximal end of the implanted distal stem component, and
installing the proximal trial instrument on the version-replicating instrument with the proximal trial instrument being locked in the selected version.
2. The method of claim 1 , wherein:
the proximal trial instrument comprises a modular proximal instrument having a discrete trial shaft and a discrete trial neck, and
installing the proximal trial instrument on the implanted distal stem component comprises: (i) installing the trial shaft to the proximal end of the implanted distal stem component, and (ii) installing the trial neck on the trial shaft.
3. The method of claim 2 , wherein the trial neck is installed on the trial shaft prior to installation of the trial shaft to the implanted distal stem component.
4. The method of claim 2 , wherein the trial neck is installed on the trial shaft after the trial shaft is installed to the implanted distal stem component.
5. The method of claim 1 , wherein:
the proximal trial instrument comprises a rotatable locking screw having a number of threads formed in a distal end thereof, and
installing the proximal trial instrument to the implanted distal stem component comprises threading the threads of the locking screw into a threaded bore of the implanted distal stem component.
6. The method of claim 1 , further comprising:
installing a proximal body component on the version-replicating instrument, and
rotating the proximal body component so that a version of the proximal body component matches the selected version of the proximal trial instrument.
7. The method of claim 6 , wherein the proximal body component is installed on the version-replicating instrument prior to installation of the trial shaft on the version-replicating instrument.
8. The method of claim 1 , wherein:
the proximal trial instrument has an alignment key formed in an outer surface thereof,
the implanted distal stem component further has a keyway formed in a superior surface thereof, and
installing the proximal trial instrument to the proximal end of the implanted distal stem component comprises positioning the alignment key of the proximal trial instrument in the keyway of the implanted distal stem component.
9. The method of claim 8 , wherein:
the version-replicating instrument has an alignment key formed in an outer surface thereof, and
installing the version-replicating instrument to the proximal end of the implanted distal stem component comprises positioning the alignment key of the version-replicating instrument in the keyway of the implanted distal stem component.
10. The method of claim 8 , wherein:
the version-replicating instrument has an alignment slot formed in the proximal end thereof, and
installing the proximal trial instrument on the version-replicating instrument comprises positioning the alignment key of the proximal trial instrument in the alignment slot of the version-replicating instrument.