Ray,
I have many clients with Mobi-C procedures done. It's an interesting device. While the materials are similar to the other poly-core ADR's, the design is somewhat different. The highly mobile core allows the joint to discover it's own 'center'; while stationary core, ball and socket devices like the ProDisc-C will provide centering force that will tend to keep things more aligned based on the location of the prosthesis. As with all of the differences from one device to the next, they come with advantages and disadvantages. Also, the advantages and disadvantages may be different for different applications. What may be better at one level, may be a disadvantage in a big multi-level contstruct.
There is much to think about and unfortunately, the answers to many questions may not be known for some time yet.
Please keep us posted... all the best,
Mark
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