RE: Education is key to a family in this situation.
All information was compiled through personal accounts and experience.
Surgeon : responsible for surgery and recovery of the area of region of surgery alone.
Primary: responsible for all else, including the injections of B-12.
Always talk to the doctor (primary) about setting up B-12 shots. Taking one bi-weekly can help and also is accepted by some insurance companies. Communicate with your primary doctor. Liquid vitamins as well as vitamin D, Iron and etc.. should be taken daily to maintain a vitamin intake since the patient doesn't get them as they use to. Given time helps as well with a little bit of physical therapy.
Do not stress out trying to figure this out. Less stress is best. Simply apply all instructed or helpful direction to better the situation you are going through. Good luck and patience.