[annapurna]

There's some thought that the degree to which the ADR moves freely improves it's tendency to overload adjacent disks and the degree to which the ADR tends to center itself or resist movement tends to aid the facets. That came out of the analytical work where multiple ADRs were simulated in computer models and the loads calculated. I'm sure I don't 100% believe it but the finite element simulations weren't all done by people paid to support a particular result so they're probably far more unbiased than you'd otherwise expect. You do have to watch the assumptions that went into those models but there's enough truth in there that it's worth asking your surgeon if you should be lucky enough to have multiple ADRs to choose from.