[annapurna]

It looks like the Simplify disk received permission for one and two level trials starting in March and October, respectively.

The idea of a ceramic core has been tried before with hip implants and caused problems due to poor modulus matching (the ceramic was too stiff) which led to bone loss. In the C-spine, though, that shouldn't be a real problem because the loading isn't as severe. The disk isn't a completely metal-free design; you would need to be sure you weren't sensitive to titanium as the end plates are coated with that to encourage bone growth.