The dentate ligaments really do not tension the cord in this situation. It is the kyphosis and the herniation that tensions the cord over this disc protrusion that causes symptoms.
Forced extension reduces the kyphosis and therefore the draping of the cord. This is why if there is enough kyphosis present, a posterior fusion surgery that reduces the kyphosis substantially can be effective in reducing compression of the cord. Forced extension is actually a test in-office to help determine if the kyphosis reduction surgery can be effective.
True myelopathy is malfunction of the cord due to compression or injury. If there are symptoms of myelopathy, long tract signs and compression of the cord, this is myelopathy.
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.