Here are a bunch of absolutly amazing and interesting resources (non-gory) showing what Sonja had done and what the Artificial Disks look like

It's right out of Star Trek:

First, the disk

Check out this animation of how the disk is constructed and moves!

Here is a graphic showing which disks she had replaced

L3 / L4

L4 / L5

L5 / S1

Opinion – Even though this disk has been approved for a long time in Europe, due to Prodisk and Charitye protecting their markets it is not available in the U.S.

With the Prodisk and Charitye products only a single disk replacement is approved in the U.S.

Both the Prodisk and Charitye are outdated products. They have a high failure rate when more than one disk is replaced. The M6 better consistentcy of natural movement and has less revision surgery generally.

The operation in Spain, Germany and England is also a fraction of the cost (assuming you can find and experienced surgeon) than it is in the U.S.