Knee implant system
View Patent ↗Knee prosthesis includes a femoral component adapted to fit on a distal end of the femur and a tibial insert component. The femoral component includes a measured anterior/posterior dimension defined by the posterior condyle surface and the interior surface of the anterior flange and a distal peg provided on a distal bone facing surface of each of the lateral and medial condylar structures, wherein the distal pegs are positioned at a midpoint of the measured anterior/posterior dimension. The implant system provides two distinct sizing segments and the tibial insert has a medial tibial aspect ratio of 0.74 and a lateral tibial aspect ratio of 0.65 to 0.68 for all sizes.
1. A distal femoral component of a knee prosthesis comprising:
a lateral condylar structure having a lateral condylar surface, a posterior portion, a posterior condylar apex, a lateral side and a bone facing surface;
a medial condylar structure having a medial condylar surface, a posterior portion, a posterior condylar apex, a medial side and a bone facing surface, said medial condylar surface being generally spherical;
the posterior portion of each of the lateral and medial condylar structures defining a posterior condylar surface;
an anterior flange connecting the lateral condylar structure and the medial condylar structure, the anterior flange having an anterior condylar surface, an interior surface and a proximal tip of the interior surface;
a measured anterior/posterior dimension defined by the posterior condyle surface and the proximal tip of the interior surface of the anterior flange;
a distal peg provided on the bone facing surface of each of the lateral and medial condylar structures, wherein the distal pegs are positioned at a midline of the measured anterior/posterior dimension for enabling midline-referenced sizing scheme for the femoral component; and
wherein the distal femoral component has a femoral aspect ratio of 0.87 to 0.95 and a measured aspect ratio of 0.80 to 0.87.
2. The distal femoral component of claim 1 , wherein the distal femoral component has a condylar spacing ratio of 0.59 to 0.62.
3. The distal femoral component of claim 1 , wherein the distal femoral component has a condylar spacing ratio of 0.55 to 0.64.
4. The distal femoral component of claim 1 , wherein the distal femoral component has a condylar spacing ratio of 0.60 to 0.63.
5. A distal femoral component of a knee prosthesis comprising:
a lateral condylar structure having a lateral condylar surface, a posterior portion, a posterior condylar apex, a lateral side and a bone facing surface;
a medial condylar structure having a medial condylar surface, a posterior portion, a posterior condylar apex, a medial side and a bone facing surface, said medial condylar surface being generally spherical;
the posterior portion of each of the lateral and medial condylar structures defining a posterior condylar surface;
an anterior flange connecting the lateral condylar structure and the medial condylar structure, the anterior flange having an anterior condylar surface, an interior surface and a proximal tip of the interior surface;
a measured anterior/posterior dimension defined by the posterior condyle surface and the proximal tip of the interior surface of the anterior flange;
a distal peg provided on the bone facing surface of each of the lateral and medial condylar structures, wherein the distal pegs are positioned at a midline of the measured anterior/posterior dimension for enabling midline-referenced sizing scheme for the femoral component; and
wherein the distal femoral component has a femoral aspect ratio of 0.97 to 1.00 and a measured aspect ratio of 0.89 to 0.91.
6. The distal femoral component of claim 5 , wherein the distal femoral component has a condylar spacing ratio of 0.60 to 0.69.