The discs are bulged or herniated posteriorly. The way this is dictated sounds somewhat confusing but it really makes sense if you understand the anatomy. Since the nerve root sack (the dural sac) is posterior to these herniations, the ANTERIOR sac is effaced by these posterior bulges.
These are typical disc herniations. You might also try epidural steroid injections if you find Pilates exercises are not as effective as you might like after three months.
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.