Fixed-bearing knee prosthesis having interchangeable components
First Claim
1. A fixed-bearing knee prosthesis, comprising:
- a femoral component having a medial condyle surface and a lateral condyle surface,a bearing having (i) a medial bearing surface configured to articulate with the medial condyle surface of the femoral component, (ii) a lateral bearing surface configured to articulate with the lateral condyle surface of the femoral component, and (iii) a reinforcing pin extending downwardly from a lower surface of the bearing, the reinforcing pin having a substantially smooth cylindrical surface extending from the lower surface to a distal tip, anda tibial tray secured to the bearing, the tibial tray having a platform with a fixation member extending downwardly from a lower surface thereof, the platform having (i) a posterior buttress extending along a posterior section of a perimeter of the platform and extending upwardly from an upper surface of the platform, (ii) an anterior buttress extending along an anterior section of the perimeter of the platform and extending upwardly from the upper surface of the platform, and (iii) an elongated bore having a superior end that opens into an upper surface of the posterior buttress, the reinforcing pin of the bearing being positioned in the elongated bore,wherein the anterior buttress has (i) a first arm extending along an anterior edge of the platform, (ii) a second arm extending along the anterior edge of the platform in a direction away from the first arm of the anterior buttress, the second arm being contiguous with the first arm, and (iii) an undercut defined therein,wherein the posterior buttress is generally Y-shaped and has (i) a first arm extending along a posterior edge of the platform and having a first undercut defined therein, (ii) a second arm extending along the posterior edge of the platform in a direction away from the first arm and having a second undercut defined therein, and (iii) a third arm extending anteriorly away from the first arm and the second arm, andwherein (i) a first imaginary line extends along a lateral-most edge of the first arm of the posterior buttress, (ii) a second imaginary line extends along a medial-most edge of the second arm of the posterior buttress and intersects the first imaginary line to define an angle of intersection therebetween, and (iii) the angle of intersection is between 45-145°
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3 Assignments
0 Petitions
Accused Products
Abstract
A fixed-bearing prosthesis includes a femoral component having a medial condyle surface and a lateral condyle surface. The knee prosthesis also includes a bearing having a medial bearing surface configured to articulate with the medial condyle surface of the femoral component, and a lateral bearing surface configured to articulate with the lateral condyle surface of the femoral component. A tibial tray is secured to the bearing. The tibial tray has a platform with an elongated stem extending downwardly from a lower surface thereof. A posterior buttress extends along a posterior section of the perimeter of the tray'"'"'s platform, and an anterior buttress extends along an anterior section of the perimeter of the tray'"'"'s platform. Differently-sized tibial trays are interchangeable with differently-sized bearings.
513 Citations
19 Claims
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1. A fixed-bearing knee prosthesis, comprising:
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a femoral component having a medial condyle surface and a lateral condyle surface, a bearing having (i) a medial bearing surface configured to articulate with the medial condyle surface of the femoral component, (ii) a lateral bearing surface configured to articulate with the lateral condyle surface of the femoral component, and (iii) a reinforcing pin extending downwardly from a lower surface of the bearing, the reinforcing pin having a substantially smooth cylindrical surface extending from the lower surface to a distal tip, and a tibial tray secured to the bearing, the tibial tray having a platform with a fixation member extending downwardly from a lower surface thereof, the platform having (i) a posterior buttress extending along a posterior section of a perimeter of the platform and extending upwardly from an upper surface of the platform, (ii) an anterior buttress extending along an anterior section of the perimeter of the platform and extending upwardly from the upper surface of the platform, and (iii) an elongated bore having a superior end that opens into an upper surface of the posterior buttress, the reinforcing pin of the bearing being positioned in the elongated bore, wherein the anterior buttress has (i) a first arm extending along an anterior edge of the platform, (ii) a second arm extending along the anterior edge of the platform in a direction away from the first arm of the anterior buttress, the second arm being contiguous with the first arm, and (iii) an undercut defined therein, wherein the posterior buttress is generally Y-shaped and has (i) a first arm extending along a posterior edge of the platform and having a first undercut defined therein, (ii) a second arm extending along the posterior edge of the platform in a direction away from the first arm and having a second undercut defined therein, and (iii) a third arm extending anteriorly away from the first arm and the second arm, and wherein (i) a first imaginary line extends along a lateral-most edge of the first arm of the posterior buttress, (ii) a second imaginary line extends along a medial-most edge of the second arm of the posterior buttress and intersects the first imaginary line to define an angle of intersection therebetween, and (iii) the angle of intersection is between 45-145°
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10. A fixed-bearing knee prosthesis, comprising:
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a femoral component having a medial condyle surface and a lateral condyle surface, a bearing having (i) a medial bearing surface configured to articulate with the medial condyle surface of the femoral component, (ii) a lateral bearing surface configured to articulate with the lateral condyle surface of the femoral component, and (iii) a reinforcing pin extending downwardly from a lower surface of the bearing, the reinforcing pin having a substantially smooth cylindrical surface extending from the lower surface to a distal tip, and a tibial tray secured to the bearing, the tibial tray having a platform with a fixation member extending downwardly from a lower surface thereof, the platform having (i) a posterior buttress extending along a posterior section of a perimeter of the platform and extending upwardly from an upper surface of the platform, (ii) an anterior buttress extending along an anterior section of the perimeter of the platform and extending upwardly from the upper surface of the platform, and (iii) an elongated bore having a superior end that opens into an upper surface of the posterior buttress, the reinforcing pin of the bearing being positioned in the elongated bore, wherein the posterior buttress is generally Y-shaped and has (i) a first arm extending along a posterior edge of the platform and having a first undercut defined therein, (ii) a second arm extending along the posterior edge of the platform in a direction away from the first arm and having a second undercut defined therein, and (iii) a third arm extending anteriorly away from the first arm and the second arm, and wherein the anterior buttress has (i) a first arm extending along an anterior edge of the platform, (ii) a second arm extending along the anterior edge of the platform in a direction away from the first arm of the anterior buttress, and (iii) an undercut defined therein. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A fixed-bearing knee prosthesis, comprising:
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a femoral component having a medial condyle surface and a lateral condyle surface, a tibial tray having a platform with a fixation member extending downwardly from a lower surface thereof, the platform having (i) a generally Y-shaped posterior buttress extending upwardly from an upper surface of the platform and having a pair of arms extending along a posterior section of a perimeter of the platform, each of the pair of arms having an undercut defined therein, and (ii) an anterior buttress extending along an anterior section of the perimeter of the platform and extending upwardly from the upper surface of the platform, the anterior buttress being discontiguous with the posterior buttress and having an undercut defined therein, and (iii) an elongated bore having a superior end that opens into an upper surface of the posterior buttress, a plurality of revision bearings configured to be separately secured to the tibial tray, wherein each of the plurality of revision bearings has (i) a width that is different from at least some of the other of the plurality of revision bearings, (ii) an upper surface having a medial bearing surface configured to articulate with the medial condyle surface of the femoral component and a lateral bearing surface configured to articulate with the lateral condyle surface of the femoral component, (iii) a lower surface having a posterior recess defined therein to receive the posterior buttress and an anterior recess defined therein to receive the anterior buttress, (iv) a reinforcing pin extending out of the posterior recess, the reinforcing pin having a substantially smooth cylindrical surface extending from a base surface of the revision bearing to a distal tip, (v) a pair of posterior locking tabs arranged to be respectively received in the undercuts defined in each of the pair of arms of the posterior buttress, and (vi) an anterior locking tab arranged to be received in the undercut defined in the anterior buttress, and a plurality of primary bearings configured to be separately secured to the tibial tray, wherein each of the plurality of primary bearings has (i) a width that is different from at least some of the other of the plurality of primary bearings, (ii) an upper surface having a medial bearing surface configured to articulate with the medial condyle surface of the femoral component and a lateral bearing surface configured to articulate with the lateral condyle surface of the femoral component, (iii) a lower surface having a posterior recess defined therein to receive the posterior buttress and an anterior recess defined therein to receive the anterior buttress, the lower surface being devoid of a reinforcing pin, (iv) a pair of posterior locking tabs arranged to be respectively received in the undercuts defined in each of the pair of arms of the posterior buttress, and (v) an anterior locking tab arranged to be received in the undercut defined in the anterior buttress. - View Dependent Claims (19)
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Specification