It would be highly unlikely but not impossible that there could be bacteria present. I am not a fan of artificial discs in the lumbar spine under any condition but certainly in this situation, an ADR is contraindicated. An XLIF is one of the cures for an infection as a fusion creates an environment unfavorable for an infection.
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.