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Dear Melinda:
Sorry to hear about your cervical disc problem. Yes, it is possible that they could fuse your entire C spine, but it would be the last resort. Besides seeing a specialist (neurosurgeon and neurologist) I would try and find out the etiology of the disc
degenerationMacular degeneration. Trauma can have a profound impact on disc function but if all the discs in the cervical cord are
degenerationMacular degeneration, there may be something else going on. I would look into your bone density, Calcium homostasis etc. But the best advise I can give you is to see an expert in disc surgery, and an expert in the neurological aspects of the cervical spine to see how much damage is there and the etiology of the damage.
As far as the martial arts, it would depend on how bad the disc degeneration is. I think that someone that examines you would have the best insight on that question.
Good luck.
Sincerely,
CCF Neuro MD