Femoral instrumentation for long stem surgery
First Claim
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1. A femoral instrumentation apparatus for long stem surgery comprising:
- (a) an elongated femoral drill/reamer for placement in the intramedullary canal to define an anatomical axis of the intramedullary canal and opening for the femoral long stem;
(b) a femoral drill guide body having a flat lower surface adapted for placement during use upon the distal femur, a line normal to the flat lower surface defining a mechanical axis;
(c) a cylindrical drill guide opening through the guide body with a central axis that aligns with the drill/reamer anatomical axis and forms an angle of between zero and twenty degrees (0°
-20°
) with the mechanical axis; and
(d) a cutting block having a flat lower surface and an opening therethrough that corresponds to the drill guide opening so that the cutting block flat surface can be oriented upon the femur using the drill/reamer after removal of the drill guide and without removal of the drill reamer to ensure that the drill guide and cutting block flat surfaces are correspondingly oriented.
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Abstract
Improved femoral instrumentation for long stem surgery provides a femoral drill guide with interchangeable femoral collets, a femoral reamer, and a femoral anterior/posterior cutting block with an adaptable anterior femoral ledge. This instrumentation allows all cuts to be made relative to the long stem component of a femoral prosthesis which will fit in the hole formed by the reamer with the collet and cutting block both oriented on the reamer, and all cuts made by the surgeon will be oriented relative to the long stem or spike component of the femoral prosthesis.
441 Citations
25 Claims
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1. A femoral instrumentation apparatus for long stem surgery comprising:
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(a) an elongated femoral drill/reamer for placement in the intramedullary canal to define an anatomical axis of the intramedullary canal and opening for the femoral long stem; (b) a femoral drill guide body having a flat lower surface adapted for placement during use upon the distal femur, a line normal to the flat lower surface defining a mechanical axis; (c) a cylindrical drill guide opening through the guide body with a central axis that aligns with the drill/reamer anatomical axis and forms an angle of between zero and twenty degrees (0°
-20°
) with the mechanical axis; and(d) a cutting block having a flat lower surface and an opening therethrough that corresponds to the drill guide opening so that the cutting block flat surface can be oriented upon the femur using the drill/reamer after removal of the drill guide and without removal of the drill reamer to ensure that the drill guide and cutting block flat surfaces are correspondingly oriented. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A femoral instrumentation apparatus for long stem surgery comprising:
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(a) an elongated femoral drill/reamer for placement in the intramedullary canal; (b) a femoral drill guide body having a pair of intersecting flanges adapted for placement during use on the anterior ledge and anterior femoral cortex of the distal femur; (c) a transverse slot across one of the flanges; (d) an opening through one of the flanges and communicating with the slot; (e) collet means removably attachable to the drill guide body at the slot for orienting the femoral drill guide using the drill/reamer, the collet means having a drill/reamer guide opening that conforms to the outer surface of the drill/reamer; and (f) cutting block means having an opening therethrough receptive of the drill/reamer and a plurality of cutting guides for properly orienting cuts by first orienting the cutting block to the drill/reamer.
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20. A method of femoral instrumentation and cutting for use in long stem surgery comprising the steps of:
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a) placing on the distal femur a drill guide body having an angled opening therethrough and an anterior ledge; b) placing the anterior ledge on the existing anterior femoral cortex; c) selectively orienting the drill guide into a desired position with respect to medial/lateral and rotational orientation; d) fixing the drill guide to the femur using a fastener; e) inserting a drill/reamer through the opening of the drill guide and partially into the femur intramedullary canal; f) removing the drill guide from the femur while maintaining a portion of the drill/reamer within the intramedullary canal; g) placing a cutting block with an angled opening therein on the drill/reamer by attachment to the opening; h) orienting the cutting block on the distal femur using the drill/reamer; and i) cutting the distal femur using the placed and oriented cutting block. - View Dependent Claims (21, 22, 23, 24, 25)
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Specification