You mention pain but stated previously that you have only back pain. Do you have leg pain too? A CT/myelogram will define the position of the screws, the cage and any nerve structures. If there is residual compression of a nerve, this test will demonstrate it.
If something is found that needs to be corrected, the surgeon may want to fix it sooner than later. Make sure you know his or her plans before the cruise you have planned.
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.