Custom replacement device for resurfacing a femur and method of making the same
First Claim
1. A method of making a replacement device, comprising the steps of:
- forming a model of a distal end of a patient'"'"'s femur;
forming a first mold from the model, wherein the first mold has a bottom side that substantially matches the trochlear groove of the patient'"'"'s femur, wherein the first mold has a top side opposite of the bottom side;
coupling a peg on a predetermined location on the bottom side of the first mold;
shaping the top side of the mold to substantially track the trochlear groove of the patient'"'"'s femur;
forming a second mold from the first mold; and
pouring viscous material into the second mold to make a replacement device.
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Accused Products
Abstract
A replacement device for resurfacing a joint surface of a femur and a method of making and installing such a 5 device is provided. The custom replacement device is designed to substantially fit the trochlear groove surface, of an individual femur. Thereby creating a “customized” replacement device for that individual femur and maintaining the original kinematics of the joint. The replacement device may be defined by four boundary points, and a first and a second surface. The first of four points is 3 to 5 mm from the point of attachment of the anterior cruciate ligament to the femur. The second point is near the bottom edge of the end of the natural articulatar cartilage. The third point is at the top ridge of the right condyle and the fourth point at the top ridge of the left condyle of the femur. The top surface is designed so as to maintain centrally directed tracking of the patella perpendicular to the plane established by the distal end of the femoral condyles and aligned with the center of the femoral head.
433 Citations
10 Claims
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1. A method of making a replacement device, comprising the steps of:
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forming a model of a distal end of a patient'"'"'s femur;
forming a first mold from the model, wherein the first mold has a bottom side that substantially matches the trochlear groove of the patient'"'"'s femur, wherein the first mold has a top side opposite of the bottom side;
coupling a peg on a predetermined location on the bottom side of the first mold;
shaping the top side of the mold to substantially track the trochlear groove of the patient'"'"'s femur;
forming a second mold from the first mold; and
pouring viscous material into the second mold to make a replacement device. - View Dependent Claims (2, 3, 4, 5)
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6. A method of forming a replacement device and a marking template device from a single mold, comprising the steps of:
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forming a model of patient'"'"'s distal end of a femur, forming a first mold from die model, wherein the first mold has a back side that matches the trochlear groove of the femur, wherein the first mold has a face side opposite of the back side;
shaping the face side of the first mold to substantially track the trochlear groove of the femur;
forming a second mold from the first mold; and
pouring a first viscous material into the second mold to make a replacement device. - View Dependent Claims (7, 8, 9, 10)
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Specification