Back & Neck Pain Spinal Conditions Print Adjacent Segment Degeneration After Surgery Medically reviewed by linkedin Medically reviewed by Scott Sundick, MD, FACS on November 14, 2019 Scott Sundick, MD, FACS, is a board-certified vascular and endovascular surgeon. He currently practices in Westfield, New Jersey. Learn about our Medical Review Board Scott Sundick, MD, FACS Written by facebook linkedin Written by Anne Asher, CPT Anne Asher, ACE-certified personal trainer, health coach, and orthopedic exercise specialist, is a back and neck pain expert. Learn about our editorial policy Anne Asher, CPT Updated on November 14, 2019 FMB PHOTO / Photo Library / Getty Images More in Back & Neck Pain Spinal Conditions Symptoms Causes & Risk Factors Diagnosis Treatment Living With Prevention Exercise Adjacent segment degeneration or ASD is a condition that often occurs after a spinal fusion or another back surgery is done. ASD affects the intervertebral joint(s) above and below the area addressed by the surgery. ASD can occur anywhere along the spine. Here’s the clinical definition of ASD: A complication of spine surgery that can be seen on an x-ray, CT scan or MRI as changes in the motion segments (i.e. the vertebral levels, or intervertebral joints) above and below the surgery site. No one knows for sure if spinal fusion actually causes adjacent segment degeneration. Certainly, there are other factors at work in the development and progression of this condition, particularly advancing age. For example, a 1999 study by Etebar published in the Journal of Neurosurgery looked at 125 fusion patients in which rigid hardware was implanted to correct degenerative instability. The study found that post-menopausal women had an especially high risk for ASD. What Makes the Joints Degenerate When You Have ASD? After a fusion surgery, you’ll likely lose the ability to move your spine at the place where the procedure was done. This means you will no longer be able to bend forward, arch back, twist or tilt your spine at the specific level or levels addressed in surgery. But that motion has to come from somewhere in order to accommodate the things you do hundreds of times during a day – things like sitting, standing, walking, reaching, lifting and more. Usually, it comes from the joints next to or near the surgery site. You might understand ASD as the result of extra wear and tear on the intervertebral joints above and below your surgery site. These joints have to do double duty in order to make up for the (now) immovable portion of your spine. As such they are subject to extra stress, and this may lead to degenerative changes. Does ASD Cause Pain? While degenerative spinal changes associated with ASD do show up on films, they do not necessarily cause symptoms (such as pain). Should symptoms emerge, however, your doctor may diagnose you with adjacent segment disease. Adjacent segment disease is a progressed form of ASD (adjacent segment degeneration) in which symptoms you did not previously experience show up. When ASD Starts Adjacent level degeneration resulting from a fusion surgery takes time to develop. Studies evaluating the incidence (number of new cases of a disease in a year) of ASD may follow spinal surgery patients for up to 20 years. In this way, researchers can give doctors and their patients an idea as to if and when degenerative changes in adjacent segments may develop. For example, studies show that people who have back surgery when they are young most likely will develop ASD as they age. One example of this may be an adolescent who undergoes spinal fusion for scoliosis. Will ASD Add to Your Medical Problems? So what will your exact diagnosis be if changes are seen on your films after a spinal fusion? Unfortunately, there is not much research on this topic. A small study done in 1988 by Lee, published in Spine and involving 18 patients found that the most common type of degeneration in cases of ASD was related to facet joint arthritis. Another study by Schlegel done in 1996, also published in Spine and involving 58 patients found incidences of spinal stenosis, disc herniation and spinal instability (an average of) 13.1 years after the surgery. The good news is the presence of the degenerative changes in your spinal joints after surgery does not necessarily mean another medical issue for you to deal with. Research attempts at correlating the findings from doctors' exams with evidence of degenerative changes in films have resulted in an unclear picture about the degree to which ASD interferes with your lifestyle after the surgery. While some people do need a second surgery or at least conservative treatment for ASD, many times it’s not necessary. Was this page helpful? Thanks for your feedback! Sign up for our Health Tip of the Day newsletter, and receive daily tips that will help you live your healthiest life. Sign Up You're in! Thank you, {{form.email}}, for signing up. There was an error. Please try again. What are your concerns? Other Inaccurate Hard to Understand Submit Article Sources Verywell Health uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our editorial policy to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy. Etebar S, Cahill DW. Risk Factors for Adjacent-Segment Failure Following Lumbar Fixation With Rigid Instrumentation for Degenerative Instability. J Neurosurg. 1999;90(2 Suppl):163-9. Lee, C.K. Accelerated Degeneration of the Segment Adjacent to a Lumbar Fusion. Spine (Phila Pa 1976). 1988 Mar;13(3):375-7. Siewe, J., et. al Comparison of Standard Fusion With a "Topping Off" System in Lumbar Spine Surgery: A Protocol for a Randomized Controlled Trial. BMC Musculoskeletal Disord. 2011. Oct 18. Cammisa, F., M.D., F.A.C.S. Chief, Spinal Surgical Service at Hospital for Special Surgery. Email Interview. Jan 2012. Hilibrand, A., MD.Et. al. Radiculopathy and Myelopathy at Segments Adjacent to the Site of a Previous Anterior Cervical Arthrodesis. Journal of Bone and Joint Surgery. 1999. Kyoung-Suok Cho, M.D., et. al. Risk Factors and Surgical Treatment for Symptomatic Adjacent Segment Degeneration after Lumbar Spine Fusion. J Korean Neurosurg Soc. 2009 November; 46(5): 425–430. Levin, et. al. Adjacent Segment Degeneration Following Spinal Fusion for Degenerative Disc Disease. Bulletin of the NYU Hospital for Joint Diseases 2007;65(1):29-36 Schlegel JD, et. al. Lumbar Motion Segment Pathology Adjacent to Thoracolumbar, Lumbar, and Lumbosacral Fusions. Spine (Phila Pa 1976). 1996 Apr 15;21(8):970-81. Toerge, J. DO, Medical Director Musculoskeletal Institute National Rehabilitation Hospital, Washington, DC. Email Interview. Jan 2012. Continue Reading