Your son injured his disc and suffered a small fracture of his vertebra. A limbus vertebra is a small “fleck” of bone that pulled off due to his growth plate still being open and the fracture occurred between his open growth plate bone and his vertebral body. Normally these limbus vertebra are not a significant finding.
However, the “L4-L5 retropulsed intervertebrea disc into thecal sac” sounds to be a disc hernation or a growth plate retropulsion (small piece of growth plate pushed backwards into the nerve sac). This is probably pushing on a nerve root causing your sons “3 yrs of pain, leg numbness,pins and needles in foot”. You need a spine surgeon to investigate your sons current condition.
Dr. Corenman
PLEASE REMEMBER, THIS FORUM IS MEANT TO PROVIDE GENERAL INFORMATION ON SPINE ANATOMY, CONDITIONS AND TREATMENTS. TO GET AN ACCURATE DIAGNOSIS, YOU MUST VISIT A QUALIFIED PROFESSIONAL IN PERSON.
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.