There is some effacement of the cord but that is just like you leaning your shoulder against a boxing bag. The more you lean, the more the cord moves. There is no entrapment of the cord. Ligamentum flavum can become torn, hypertrophied or attenuated with time and/or injury.
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.