The two most important factors are to get your husband in optimal medical condition as time permits and select a board certified anesthesiologist competent in regional anesthesia.
This is not medical advice as I have inadequate information regarding your husband. A board certified anesthesiologist can usually manage such a problem as it is not uncommon.
Additionally, I would explore the use of hyperbaric oxygen therapy both pre and post operatively to enhance healing.
May God bless.
William E. Webb, Jr., M.D.