The C1-2 fusion is not a common surgery as this level is normally stable. Unfortunately, fusion of this level will reduce the ability of head rotation (looking over your shoulder) by at least 50%.That is the price to be paid for preventing a potential devastating cord injury in your case.
Small C2 pedicles do not preclude a successful fusion surgery. Fusion down to C3 can help if necessary and wiring of the C2 arch can help. Also lamina screws of C2 (every C2 vertebra has thick lamina) are very successful and create a great stabilization base.
Donald Corenman, MD, DC is a highly-regarded spine surgeon, considered an expert in the area of neck and back pain. Trained as both a Medical Doctor and Doctor of Chiropractic, Dr. Corenman earned academic appointments as Clinical Assistant Professor and Assistant Professor of Orthopaedic Surgery at the University of Colorado Health Sciences Center, and his research on spine surgery and rehabilitation has resulted in the publication of multiple peer-reviewed articles and two books.