Besides an alkiline environment, discs have special issues regarding circulation. I suggest that you and/or your friend do some study of this so that you can clearly visualize what needs to happen for healing to occur. Then you are in the best position to facilitate that healing.
I've used real simple tools to do this, such as "The Anatomy Coloring Book". It is old, I don't know if still avaiable. Very easy to undrstand.