Scoliosis is a sideways curvature of the spine, measured on a standing X-ray and reported as a Cobb angle. A curve of 10 degrees or more meets the definition.
In adults it comes in two quite different forms. Telling them apart changes everything that follows.
Adult idiopathic scoliosis is a curve that formed in the teen years and has carried into adult life. The curve itself is old news. What is new is how a grown, wearing spine handles it.
Adult degenerative scoliosis — also called de novo scoliosis — is a curve that did not exist in youth. It formed later, as the discs and facet joints on one side of the spine wore down faster than on the other. It comes from uneven wear, not a growth problem. And it is more and more common as the population ages.
According to PubMed, a 12-year study followed 60 community volunteers aged 50 to 84 who had no scoliosis at the start. Twenty-two of them developed a curve of 10 degrees or more over that time. Uneven disc wear and uneven bone spurs each predicted it on their own. More than a 20 percent drop in disc height on one side predicted a new curve. So did a bone spur more than 5 millimeters longer on one side (Kobayashi T, Atsuta Y, Takemitsu M, Matsuno T, Takeda N. Spine (Phila Pa 1976). 2006;31(2):178-82. DOI).
That is a useful cause to hold onto. The curve is the visible result of one side of a segment collapsing faster than the other. So the pain sources are mostly the structures now loaded unevenly, not the curve as a shape.
This is the most useful thing to know about adult scoliosis, and it runs against instinct.
Patients with big curves are often comfortable. Patients with modest curves often are not. That is because pain in adult scoliosis comes from specific structures. A nerve root may be crowded in the narrowed opening on the inside of the curve. Facet joints may be loaded unevenly. A segment may have become unstable. And back muscles may be working nonstop to hold the trunk upright. None of those match the Cobb angle cleanly.
What matches symptoms and function better in adults is front-to-back balance. Does your head sit over your pelvis when you stand? Some patients must bend their knees or tilt their pelvis to keep their eyes level. They are doing constant muscle work. That is a different and bigger problem than a side-to-side curve of the same size.
The practical result: an adult with scoliosis and back pain needs the same diagnostic work as an adult without it. The curve is context. It is not, by itself, the answer.
Leg weakness that keeps getting worse, saddle numbness, or a change in bowel or bladder control is checked urgently, not scheduled. Call us or go to an emergency department.
Standing imaging, not supine imaging alone. A curve and its balance can only be judged under load. Full-length standing X-rays show the Cobb angle, the pelvis measures, and whether the head sits over the pelvis. An MRI done lying down does not. That is why a report from a lying-down scan answers a different question from the one being asked.
Examination. Where is the pain compared with the curve? Is there nerve loss? How are balance and walking affected? How much muscle work goes into standing upright?
Diagnostic blocks, which do the discriminating. A curved spine always has several possible pain sources. A small dose of numbing drug is placed precisely under image guidance. It can go on the nerves of one facet joint, on one nerve root, or into the sacroiliac joint. That tests the sources one at a time. In this condition more than most, that is what separates a treatment plan from a string of guesses.
Nerve testing where the picture is mixed. EMG and nerve conduction studies tell a pinched root apart from peripheral neuropathy (damage to nerves outside the spine).
Exercise and conditioning, which carry more weight here than in most spine conditions. Muscle holds a curved spine upright. Endurance and strength in the back and hip muscles make the difference between a curve you can live with and a curve that runs your day. Losing fitness in adult scoliosis is not a side issue.
Bone health. Curves in older adults often come with thinner bones. A compression fracture in a curved spine both speeds up the curve and causes sudden pain. Bone health belongs in the plan — see fitness and bone strength and, for the fracture case, sudden back pain and vertebral fracture.
Metabolic drivers and body weight, because uneven load is the cause, and load can be changed — medical weight management, lifestyle medicine.
Image-guided injections targeted at a confirmed structure. Selective nerve root blocks and epidural steroid injections treat a crowded root. Facet injections, medial branch blocks and radiofrequency ablation treat confirmed facet pain. All are done under local numbing with no sedation. Patients are awake, drive themselves home, and are back to normal activity, including work, within two to four hours.
Neuromodulation when confirmed nerve pain lasts and curve surgery is not right for that patient — spinal cord stimulation, tried before it is implanted.
Where adolescent scoliosis is the question. Growing spines are managed differently. Monitoring, bracing and growth-related choices belong with child and deformity specialists. We will point you to the right kind of clinic instead of managing it here.
Adult deformity correction is major spine surgery. It usually fuses many levels with rods and screws. Sometimes bone is cut to restore alignment. It carries much higher rates of complications and repeat surgery than the smaller spine operations covered elsewhere on this site. It can also transform the life of the right patient. Both are true, and a patient deserves to hear both.
It is the right talk in a few cases. Nerve loss keeps getting worse. A curve is proven to be growing. Front-to-back imbalance has grown bad enough to hurt standing, walking or looking forward. Or severe pain, traced to known sources, has not responded to a real course of conservative (nonsurgical) and interventional care.
It is not the right answer to the size of a curve on a scan in a patient who is doing fine. And it is not the answer to back pain in a patient with scoliosis whose real pain source has never been tested. Many adults with curves have pain from a single facet joint or a single crowded nerve root. Those problems have far smaller fixes.
Dr. Gurpreet Singh Padda, MD, MBA, MHP is a licensed physician and surgeon with surgical privileges. This practice performs minimally invasive spine procedures. When a patient needs a many-level deformity correction, we say so directly and make the referral. The goal is the right operation, not the nearest one.
Having a curve does not mean your pain has been explained. We see patients from across St. Louis, Florissant, St. Charles and the Illinois Metro East. Call us or request an evaluation.
No, and this surprises most patients. Big curves are often comfortable, and modest curves often are not. The pain comes from specific structures being loaded or crowded, not from the shape itself. It may be a nerve root in a narrowed opening, unevenly loaded facet joints, or muscle working nonstop. What matches symptoms better in adults is whether the head sits over the pelvis when you stand. Read more: When the scan does not match the pain.
That is degenerative or de novo scoliosis. It forms when one side of a spine segment collapses faster than the other. A 12-year study followed 60 adults aged 50 to 84 with no curve at the start. Of them, 22 developed one. More than a 20 percent drop in disc height on one side predicted it. So did a bone spur more than 5 millimeters longer on one side. It is uneven wear made visible. Read more: Where arthritis pain actually comes from.
Some curves grow, and many stay stable for years. The useful measure is change over time on matching standing X-rays, not a single number. Watch balance and function closely, not the angle alone. And watch bone health, because a compression fracture in a curved spine can change the course quickly. Read more: Sudden back pain and vertebral fracture.
They do not change a curve, and nobody should claim they do. What they can do is treat the specific structure the curve has overloaded, like a crowded nerve root or a facet joint. First that structure must be confirmed by a test block. That is often the difference between a patient who is doing fine and a surgical candidate. Read more: Diagnosing facet pain with a medial branch block.
Yes, and it does real work. A curved spine relies on muscle endurance to stay upright. So trunk and hip strength changes how much of your day the curve controls. What matters is a program built for your curve and your balance, not a general back routine. Read more: Muscle, myokines and chronic pain.
Because a curve narrows the opening where a nerve root leaves the spine on the inside of the curve. That causes one-sided leg pain along a single line, with matching numbness or weakness. That is a separate problem on top of the curve. It can be tested, and it is often very treatable. Read more: Spinal stenosis and leg pain when walking.
It depends on what is really driving your symptoms, and on whether smaller fixes have truly been tried. Deformity correction is major surgery. It has much higher rates of complications and repeat surgery than smaller spine operations. It can also transform life for the right patient. Both facts belong in the talk. So does a workup that has tested each possible pain source. Read more: Orthopedic surgeon, neurosurgeon or pain physician?
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