Neck length measuring device and method of using same for implanting a hip prosthesis
First Claim
1. A method of implanting a hip prosthesis comprising the steps of:
- determining a desired neck size for a femoral prosthesis having a longitudinal axis and a neck projection;
positioning said femoral prosthesis in a femur having a greater trochanter;
advancing an end of a locator rod component, which has reference distance markings on a side and a greater trochanter locator, toward said femoral prosthesis along an axis parallel to said longitudinal axis until said greater trochanter locator is contacting said greater trochanter of said femur;
positioning a neck sizing component, which has neck size markings, adjacent said neck projection of said femoral prosthesis;
determining a reference distance by identifying which of said reference distance markings of said locator rod component corresponds to a desired neck size marking on said neck sizing component along a line substantially perpendicular to said longitudinal axis.
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Accused Products
Abstract
A method of implanting a hip prosthesis includes utilization of a device at the implantation site to confirm that the femoral prosthesis will have a neck length corresponding to a preoperative plan. First, a desired neck size for the femoral prosthesis is determined. Then, the femoral prosthesis is positioned in the femur. Next, a locator rod component is advanced toward the femoral prosthesis along an axis parallel to the longitudinal axis of the femoral prosthesis until a greater trochanter locator mounted on the side of the locator rod component is as close as possible to contacting the greater trochanter of the femur. Next, a neck sizing component, which has neck size markings on its outer surface, is placed on the neck projection of the femoral prosthesis. Finally, a reference distance is determined by identifying which of the reference distance markings of the locator rod component corresponds to a desired neck size marking on the neck measuring device along a line substantially perpendicular to the longitudinal axis of the femoral prosthesis. The determined reference distance should correspond to a planned reference distance that was determined in an appropriate preoperative templating and measuring procedure.
255 Citations
17 Claims
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1. A method of implanting a hip prosthesis comprising the steps of:
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determining a desired neck size for a femoral prosthesis having a longitudinal axis and a neck projection; positioning said femoral prosthesis in a femur having a greater trochanter; advancing an end of a locator rod component, which has reference distance markings on a side and a greater trochanter locator, toward said femoral prosthesis along an axis parallel to said longitudinal axis until said greater trochanter locator is contacting said greater trochanter of said femur; positioning a neck sizing component, which has neck size markings, adjacent said neck projection of said femoral prosthesis; determining a reference distance by identifying which of said reference distance markings of said locator rod component corresponds to a desired neck size marking on said neck sizing component along a line substantially perpendicular to said longitudinal axis. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A combination neck length measuring device and hip prosthesis comprising:
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a hip prosthesis having a longitudinal axis and a neck projection formed at a neck angle with respect to said longitudinal axis a locator rod component having a side and a long axis parallel to said longitudinal axis, and said side having a plurality of reference distance markings along said long axis, and having a greater trochanter locator attached to said side, and said locator rod component being positioned adjacent said hip prosthesis; and a neck sizing component mounted on said neck projection and having an outer surface with a plurality of neck size markings distributed along a line substantially parallel to said long axis. - View Dependent Claims (8)
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9. A neck length measuring device for use in implanting a hip prosthesis having a longitudinal axis and a neck projection formed at a neck angle with respect to said longitudinal axis comprising:
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a locator rod component having a side and a long axis, and said side having a plurality of reference distance markings along said long axis, and having a greater trochanter locator attached to said side, and said greater trochanter locator having a locating surface positioned away from, and substantially perpendicular to, said long axis, and said locator rod component has a longitudinal bore along said long axis sized to slidably receive a femoral inserter therethrough; and a neck sizing component having an outer surface with a plurality of neck size markings distributed along a line substantially parallel to said long axis. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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Specification