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Increased contact stress within the polyethylene
20%
145/715
Increased risk of polyethylene delamination
7%
52/715
Decreased mechanical forces transferred to the fixation surfaces
25%
179/715
Decreased femoral rollback during flexion
39%
282/715
Increased femoral rotation during flexion
6%
41/715
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Increasing conformity between the tibial polyethylene bearing and the femoral component has desirable and undesirable consequences. Increased conformity increases the contact area and thereby reduces contact stress within the polyethylene. This can lead to less risk of polyethylene wear, fracture, and delamination. However, increasing conformity also limits the ability of the femur to roll back during flexion, and may transfer increased shear stress to the fixation surfaces of the implants.
2.7
(17)
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