Femoral resection instrumentation including three-dimensional jig and method of use
First Claim
1. A set of instruments for use in the preparation of the distal end of a femur for the implantation of a femoral prosthesis, which implantation requires resecting the anterior femoral condyles by making an anterior cut, distal femoral condyles by making a distal cut and first and second angle cuts, and posterior femoral condyles by making a posterior cut, said set comprising:
- a jig comprising a body portion having parallel distal and proximal base faces, connected by parallel posterior and anterior base faces, wherein the proximal base face is adapted to abut the distal end of the femur;
said jig further including a posterior portion slideably engaged with said body portion for movement parallel to the proximal and distal base faces and the distal base face of the body portion including a first sizing indicator, wherein the sliding movement of the posterior portion indicates varying sizes on the first sizing indicator, said posterior portion including first and second skids extending in the proximal direction from the body portion, paid skids having anterior faces adapted to contact the posterior femoral condyles;
said body portion of said jig further including an aperture through its distal and proximal faces for receiving a bushing;
a bushing extending through said distal face and adapted to receive an intramedullary rod, said bushing further including a valgus angle guide means adapted to adjust the angular position of said intramedullary rod within the range of 15 degrees below and 15 degrees above an angle of ninety degrees with the distal face of the body portion of the jig;
a stylus removably attachable to the anterior face of said body portion, said stylus including a cross bar slideably engaged with the stylus for movement in the proximal-distal direction and a second sizing indicator, wherein the sliding movement of the cross bar indicates varying sizes on the second sizing indicator; and
a distal cutting guise removably attachable to the anterior face of said body portion, said distal cutting guide having a plurality of fixation holes and a slot for guiding a saw blade for making the distal cut for resection of the distal femur, wherein the stylus and the distal cutting guide are both attachable to the anterior face but not simultaneously.
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Accused Products
Abstract
A set of instruments and method for use in knee replacement surgery, specifically to make the necessary femoral resections is described. The simplified set of instruments allows the necessary femoral resections to be performed with fewer instruments, and with fewer necessary steps for the surgeon to take. The set of instruments includes a three-dimensional jig which references the anterior and posterior femoral condyles to allow determinations as to alignment, placement, and prosthesis size before any bone cuts are made.
258 Citations
14 Claims
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1. A set of instruments for use in the preparation of the distal end of a femur for the implantation of a femoral prosthesis, which implantation requires resecting the anterior femoral condyles by making an anterior cut, distal femoral condyles by making a distal cut and first and second angle cuts, and posterior femoral condyles by making a posterior cut, said set comprising:
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a jig comprising a body portion having parallel distal and proximal base faces, connected by parallel posterior and anterior base faces, wherein the proximal base face is adapted to abut the distal end of the femur; said jig further including a posterior portion slideably engaged with said body portion for movement parallel to the proximal and distal base faces and the distal base face of the body portion including a first sizing indicator, wherein the sliding movement of the posterior portion indicates varying sizes on the first sizing indicator, said posterior portion including first and second skids extending in the proximal direction from the body portion, paid skids having anterior faces adapted to contact the posterior femoral condyles; said body portion of said jig further including an aperture through its distal and proximal faces for receiving a bushing; a bushing extending through said distal face and adapted to receive an intramedullary rod, said bushing further including a valgus angle guide means adapted to adjust the angular position of said intramedullary rod within the range of 15 degrees below and 15 degrees above an angle of ninety degrees with the distal face of the body portion of the jig; a stylus removably attachable to the anterior face of said body portion, said stylus including a cross bar slideably engaged with the stylus for movement in the proximal-distal direction and a second sizing indicator, wherein the sliding movement of the cross bar indicates varying sizes on the second sizing indicator; and a distal cutting guise removably attachable to the anterior face of said body portion, said distal cutting guide having a plurality of fixation holes and a slot for guiding a saw blade for making the distal cut for resection of the distal femur, wherein the stylus and the distal cutting guide are both attachable to the anterior face but not simultaneously. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for preparing the distal end of a femur for the implantation of a femoral prothesis comprising the steps of:
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drilling a hole in the intramedullary canal of a femur;
providing;a jig comprising a body portion having parallel distal and proximal base faces, connected by parallel posterior and anterior base faces, wherein the proximal base face is adapted to abut the distal end of the femur; said jig further including a posterior portion slideably engaged with said body portion for movement parallel to the proximal and distal base faces and the distal base face of the body portion including a first sizing indicator, wherein the sliding movement of the posterior portion indicates varying sizes on the first sizing indicator, said posterior portion including first and second skids extending in the proximal direction from the body portion, said skids having anterior faces adapted to contact the posterior femoral condyles; said body portion of said jig further including an aperture through its distal and proximal faces for receiving a bushing; a bushing extending through said distal face and adapted to receive an intramedullary rod, said bushing further including a valgus angle guide means adapted to adjust the angular position of said intramedullary rod within the range of 15 degrees below and 15 degrees above an angle of ninety degrees with the distal face of the body portion the jig; a stylus removably attachable to the anterior face of said body portion, said stylus including a cross bar slidably engaged with the stylus for movement in the proximal-distal direction and a second sizing indicator, wherein the sliding movement of the cross bar indicates varying sizes on the second sizing indicator; and a distal cutting guide removably attachable to the anterior face of said body portion, said distal cutting guide having a plurality of fixation holes and a slot for guiding a saw blade for making the distal cut for resection of the distal femur, wherein the stylus and the distal cutting guide are both attachable to the anterior face but not simultaneously; setting the valgus angle guide to the desired valgus angle; attaching the stylus to the anterior surface of the jig; flexing a knee to greater than 90°
;inserting the intramedullary rod through the bushing and into the femur; placing the skids against the posterior condyles of femur; positioning the jig against the uncut distal femoral condyle; noting the size indicated on the first sizing indicator; positioning the stylus so that the second sizing indicator indicates the same size as the first sizing indicator on the dictal face of the jig; fixing the jig to the bone by inserting at least one pin through apertures extending through the proximal face of the body portion; removing said stylus from the jig; making an anterior cut so as to resect a portion of bone from the anterior distal femur; attaching the distal cutting block to the anterior face of said body portion; placing fixation pine through predetermined holes of said block and into the femur; removing the jig; assessing the implant size; and making a distal out using the slot provided on the distal cutting block so as to resect a portion of bone from the distal face of the femur to form a flat-cut surface. - View Dependent Claims (12, 13, 14)
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Specification