Prosthesis system including tibial bearing component
According to one example, a tibial bearing component for articulation with a medial condyle and a lateral condyle of a femoral component in a knee replacement procedure is disclosed. The tibial bearing component can include a distal surface and an articular surface opposing the distal surface. The articular surface can include a medial compartment and a lateral compartment configured for articulation with the medial condyle and the lateral condyle of the femoral component, respectively. The lateral compartment can have a lateral articular track with a lateral anterior-posterior extent. The lateral articular track can comprise a plurality of distal-most points along a proximal surface of the lateral compartment that are contacted by the lateral condyle during rollback of the femoral component. The medial compartment can differ in configuration from the lateral compartment and can have an anterior lip height of between about 9 mm and about 13 mm.
1. A tibial bearing component for articulation with a medial condyle and a lateral condyle of a femoral component in a knee replacement procedure, the tibial bearing component comprising:
a distal surface; and
an articular surface opposing the distal surface, the articular surface including a medial compartment and a lateral compartment configured for articulation with the medial condyle and the lateral condyle of the femoral component, respectively;
the lateral compartment having a lateral articular track with a lateral anterior-posterior extent, the lateral articular track comprising a plurality of distal-most points along a proximal surface of the lateral compartment that are contacted by the lateral condyle during rollback of the femoral component;
the medial compartment differing in configuration from the lateral compartment and having an anterior lip height as measured from a distal-most point of the articular surface to a proximal-most point of the medial compartment of between 9 mm and 13 mm, wherein the medial compartment is configured relative to the medial condyle to have between 31% and 63% of an overall surface area thereof contacted by the medial condyle of the femoral component with the femoral component in 0° flexion.
2. The tibial bearing component of claim 1 , wherein the lateral compartment has an anterior portion and a posterior portion, the anterior portion defines the lateral articular track as a nominally straight line when projected onto a transverse plane of the tibial bearing component, the posterior portion defines the lateral articular track with a curved line toward the medial compartment when projected onto the transverse plane of the tibial bearing component.
3. The tibial bearing component of claim 2 , wherein the lateral compartment has a first sagittal radius in the anterior portion and a second sagittal radius in the posterior portion.
4. The tibial bearing component of claim 1 , wherein the medial compartment has a medial articular track with a medial anterior-posterior extent that differs from the lateral anterior-posterior extent, the medial articular track comprising a plurality of distal-most points along a proximal surface of the medial compartment that are contacted by the medial femoral condyle during rollback of the femoral component, wherein the medial compartment defines the medial articular track as a nominally straight line when projected onto the transverse plane of the bearing component and the medial articular track has a single sagittal radius.
5. The tibial bearing component of claim 4 , wherein the medial compartment is configured to have a medial dwell point a distance between 61% and 66% of a total anterior-posterior extent of the tibial bearing component as measured from an anterior most point to a posterior most point of the tibial bearing component.
6. The tibial bearing component of claim 1 , wherein the lateral compartment is configured to have a lateral dwell point a distance between 65% and 69% of a total anterior-posterior extent of the tibial bearing component as measured from an anterior most point to a posterior most point of the tibial bearing component.
7. The tibial bearing component of claim 1 , wherein the medial compartment is configured to have between a 1:1 congruence ratio and a 1.1:1 congruence ratio with the medial condyle, the congruence ratio comprising a ratio of the similarity between a sagittal radius of the medial compartment and a sagittal radius of the medial condyle.
8. A tibial bearing component for articulation with a medial condyle and a lateral condyle of a femoral component in a knee replacement procedure, the tibial bearing component comprising:
a distal surface; and
an articular surface opposing the distal surface, the articular surface including a medial compartment and a lateral compartment configured for articulation with the medial condyle and the lateral condyle of the femoral component, respectively;
the lateral compartment configured to have a lateral dwell point a distance between 65% and 69% of a total anterior-posterior extent of the tibial bearing component as measured from an anterior most point to a posterior most point of the tibial bearing component;
wherein the medial femoral condyle undergoes 3 mm of anterior-posterior translation relative to 11 mm of anterior-posterior translation of the lateral femoral condyle from 0° to 120° degrees of flexion.
9. The tibial bearing component of claim 8 , wherein the medial compartment differs in configuration from the lateral compartment and has an anterior lip height of between 9 mm and 13 mm as measured from a distal-most point of the articular surface to a proximal-most point of the medial compartment.
10. The tibial bearing component of claim 8 , wherein the lateral compartment has a lateral articular track with a lateral anterior-posterior extent, the lateral articular track comprising a plurality of distal-most points along a proximal surface of the lateral compartment that are contacted by the lateral condyle during rollback of the femoral component, and wherein the lateral compartment has an anterior portion and a posterior portion, the anterior portion defines the lateral articular track as a nominally straight line when projected onto a transverse plane of the tibial bearing component, the posterior portion defines the lateral articular track with a curved line toward the medial compartment when projected onto the transverse plane of the tibial bearing component.
11. The tibial bearing component of claim 10 , wherein the lateral compartment has a first sagittal radius in the anterior portion and a second sagittal radius in the posterior portion.
12. A tibial bearing component for articulation with a medial condyle and a lateral condyle of a femoral component in a knee replacement procedure, the tibial bearing component comprising:
a distal surface; and
an articular surface opposing the distal surface, the articular surface including a medial compartment and a lateral compartment configured for articulation with the medial condyle and the lateral condyle of the femoral component, respectively;
wherein the medial compartment is configured relative to the medial condyle to have between 31% and 63% of an overall surface area thereof contacted by the medial condyle of the femoral component with the femoral component in 0° flexion.
13. The tibial bearing component of claim 12 , wherein the lateral compartment configured to have a lateral dwell point a distance between 65% and 69% of a total anterior-posterior extent of the tibial bearing component as measured from an anterior most point to a posterior most point of the tibial bearing component.
14. The tibial bearing component of claim 13 , wherein the medial compartment is configured to have a medial dwell point a distance between 61% and 66% of a total anterior-posterior extent of the tibial bearing component as measured from an anterior most point to a posterior most point of the tibial bearing component.
15. The tibial bearing component of claim 12 , wherein the medial compartment differs in configuration from the lateral compartment and has an anterior lip height of between 9 mm and 13 mm as measured from a distal-most point of the articular surface to a proximal-most point of the medial compartment.
16. The tibial bearing component of claim 12 , wherein the medial compartment is configured to have between a 1:1 congruence ratio and a 1.1:1 congruence ratio with the medial condyle, the congruence ratio comprising a ratio of the similarity between a sagittal radius of the medial compartment and a sagittal radius of the medial condyle.
17. The tibial bearing component of claim 12 , wherein the lateral compartment has a lateral articular track with a lateral anterior-posterior extent, the lateral articular track comprising a plurality of distal-most points along a proximal surface of the lateral compartment that are contacted by the lateral condyle during rollback of the femoral component, and wherein the lateral compartment has an anterior portion and a posterior portion, the anterior portion defines the lateral articular track as a nominally straight line when projected onto a transverse plane of the tibial bearing component, the posterior portion defines the lateral articular track with a curved line toward the medial compartment when projected onto the transverse plane of the tibial bearing component.
18. The tibial bearing component of claim 17 , wherein the lateral compartment has a first sagittal radius in the anterior portion and a second sagittal radius in the posterior portion.