The spondy conditiions refer to some instability in your spine, where the ligaments do not hold the vertebrae in proper alignment. Gross instability is often caused by significant structural issues (like pars fractures). This type of issue will likely exclude you from many of the motion preservation techniques like ADR.
A more benign form of instability comes from the DDD. If you think of your disc as something like an innertube on it's side, when you let the air out, it gets wobbly and loses some of it's structural integrity. This type of instability will not be a contraindication to ADR because 'jacking up' the disc space with the prosthesis that restores most of the lost disc height will retension the system.
Were the injections prositive?
Good luck! Please keep us posted.
Mark
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