Femoral guide for implanting a femoral knee prosthesis and method
First Claim
1. A femoral sizing guide for use in selecting a femoral knee prosthesis of a standard size for implant at an implant site at a distal femur of a femur extending in an axial direction within a recipient, the distal femur having posterior condyles with corresponding posterior condylar surfaces, a prepared distal femoral surface, and a transepicondylar axis extending transverse to the axial direction, the femoral sizing guide being arranged for engagement with the prepared distal femoral surface and the posterior condylar surfaces to provide a size indication for a femoral knee prosthesis of a size appropriate for the implant site, and enabling interoperative determination of an optimum location and orientation of an anterior cut appropriate to accommodate the selected knee prosthesis of standard size at the implant site, the femoral sizing guide comprising:
- a femoral sizing block having a block locator surface for extending transverse to the axial direction upon engagement of the femoral sizing block with the prepared distal surface, and a guide arrangement for determining the location of a femoral cutting guide to be placed subsequently at the distal femur for guiding execution of the anterior cut;
a foot component including foot locator surfaces projecting in the axial direction for engaging the posterior condylar surfaces upon engagement of the block locator surface with the prepared distal femoral surface; and
a pivotal connection connecting the foot component with the femoral sizing block, the pivotal connection being located for pivotal movement of the femoral sizing block relative to the foot locator surfaces about a pivotal axis extending generally in the axial direction and essentially intersecting the transepicondylar axis so as to enable orientation of the femoral sizing block to locate the guide arrangement for subsequent placement of the femoral cutting guide in position to locate the anterior cut in a plane anterior of and essentially parallel to the transepicondylar axis.
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0 Petitions
Accused Products
Abstract
A femoral guide is shown in the form of a femoral sizing guide for determining the size of a femoral knee prosthesis to be implanted at an implant site at a distal femur and includes a femoral sizing block connected to a foot component for selective pivotal movement about a pivotal axis extending in a generally axial direction and essentially intersecting the transepicondylar axis of the distal femur to enable a guide arrangement on the femoral sizing block to be located for facilitating subsequent placement of a femoral cutting guide on a distal femur in position to rotationally locate an anterior cut in a plane anterior of and essentially parallel to the transepicondylar axis of the distal femur. The femoral sizing block is connected to the foot component for selective linear movement to compensate for size variations outside standard femoral knee prosthesis sizes. Visible indications are provided of the location of a subsequently implanted femoral knee prosthesis. A corresponding method determines the appropriate location and position of the femoral knee prosthesis to be implanted at the implant site, and the size of the femoral knee prosthesis.
196 Citations
26 Claims
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1. A femoral sizing guide for use in selecting a femoral knee prosthesis of a standard size for implant at an implant site at a distal femur of a femur extending in an axial direction within a recipient, the distal femur having posterior condyles with corresponding posterior condylar surfaces, a prepared distal femoral surface, and a transepicondylar axis extending transverse to the axial direction, the femoral sizing guide being arranged for engagement with the prepared distal femoral surface and the posterior condylar surfaces to provide a size indication for a femoral knee prosthesis of a size appropriate for the implant site, and enabling interoperative determination of an optimum location and orientation of an anterior cut appropriate to accommodate the selected knee prosthesis of standard size at the implant site, the femoral sizing guide comprising:
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a femoral sizing block having a block locator surface for extending transverse to the axial direction upon engagement of the femoral sizing block with the prepared distal surface, and a guide arrangement for determining the location of a femoral cutting guide to be placed subsequently at the distal femur for guiding execution of the anterior cut;
a foot component including foot locator surfaces projecting in the axial direction for engaging the posterior condylar surfaces upon engagement of the block locator surface with the prepared distal femoral surface; and
a pivotal connection connecting the foot component with the femoral sizing block, the pivotal connection being located for pivotal movement of the femoral sizing block relative to the foot locator surfaces about a pivotal axis extending generally in the axial direction and essentially intersecting the transepicondylar axis so as to enable orientation of the femoral sizing block to locate the guide arrangement for subsequent placement of the femoral cutting guide in position to locate the anterior cut in a plane anterior of and essentially parallel to the transepicondylar axis. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of utilizing a femoral sizing guide for implanting a selected femoral knee prosthesis of a standard size at an implant site at a distal femur of a femur extending in an axial direction within a recipient, the distal femur having posterior condyles with corresponding posterior condylar surfaces, a prepared distal femoral surface, and a transepicondylar axis extending transverse to the axial direction, the femoral sizing guide being arranged for engagement with the prepared distal femoral surface and the posterior condylar surfaces to provide a size indication for a femoral knee prosthesis of a size appropriate for the implant site, and enabling interoperative determination of an optimum location and orientation of an anterior cut appropriate to accommodate the selected knee prosthesis of standard size at the implant site, the method comprising:
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engaging a femoral sizing block of the femoral sizing guide with the prepared distal surface, the femoral sizing block having a block locator surface such that the block locator surface rests against the prepared distal surface and extends transverse to the axial direction, the femoral sizing block further having a guide arrangement for determining the location of a femoral cutting guide to be placed subsequently at the distal femur for guiding execution of the anterior cut;
engaging a foot component with the posterior condylar surfaces upon engagement of the block locator surface with the prepared distal femoral surface, the foot component including foot locator surfaces projecting in the axial direction for engaging the posterior condylar surfaces; and
pivotally moving the femoral sizing block relative to the foot locator surfaces about a pivotal axis extending generally in the axial direction and essentially intersecting the transepicondylar axis so as to enable orientation of the femoral sizing block to locate the guide arrangement for subsequent placement of the femoral cutting guide in position to locate the anterior cut in a plane anterior of and essentially parallel to the transepicondylar axis. - View Dependent Claims (10, 11)
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12. A femoral guide for use in connection with implanting a femoral knee prosthesis at an implant site at a distal femur of a femur extending in an axial direction within a recipient, the distal femur having a transepicondylar axis extending transverse to the axial direction, the femoral guide being arranged for engagement with the distal femur to enable interoperative determination of an optimum location and orientation of at least one femoral cut appropriate to accommodate the knee prosthesis at the implant site, the femoral guide comprising:
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a femoral block for engagement with the distal femur, the femoral block having a guide arrangement for determining the location and orientation of the at least one femoral cut;
a support component for placement at a predetermined position relative to the distal femur; and
a pivotal connection connecting the support component with the femoral block, the pivotal connection being located for pivotal movement of the femoral block relative to the support component about a pivotal axis extending generally in the axial direction and essentially intersecting the transepicondylar axis so as to enable orientation of the femoral block to rotationally position the guide arrangement for subsequent rotational orientation of the at least one femoral cut relative to the transepicondylar axis. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method of utilizing a femoral guide in connection with implanting a femoral knee prosthesis at an implant site at a distal femur of a femur extending in an axial direction within a recipient, the distal femur having a transepicondylar axis extending transverse to the axial direction, the femoral guide being arranged for engagement with the distal femur to enable interoperative determination of an optimum location and orientation of at least one femoral cut appropriate to accommodate the knee prosthesis at the implant site, the method comprising:
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engaging a femoral block of the femoral guide with the distal femur, the femoral block further having a guide arrangement for determining the location and orientation of the at least one femoral cut;
placing a support component at a predetermined position relative to the distal femur; and
pivotally moving the femoral block relative to the support component about a pivotal axis extending generally in the axial direction and essentially intersecting the transepicondylar axis so as to enable orientation of the femoral block to rotationally position the guide arrangement for subsequent rotational orientation of the at least one femoral cut relative to the transepicondylar axis. - View Dependent Claims (23, 24, 25, 26)
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Specification