Scoliosis is usually thought of as a childhood condition — a curve found on a school screening, watched through the teenage years. Adult degenerative scoliosis is a different condition with the same name. The curve develops in adulthood, in a spine that was previously straight, because the discs and facet joints wear unevenly. One side of a disc thins faster than the other, one facet joint arthritic before its partner, and the spine leans toward the worn side. Over years, the lean becomes a curve. This piece is about that curve only — the adult degenerative form — and nothing else in the scoliosis family.
What it is
Adult scoliosis is defined as a spinal deformity in a skeletally mature patient with a Cobb angle of more than 10 degrees in the coronal plane — the sideways plane, measured on a standing X-ray (Aebi, European Spine Journal, 2005). The Cobb angle is the angle between the most tilted vertebrae at the top and bottom of the curve; more than 10 degrees is the threshold at which a sideways bend counts as scoliosis rather than normal variation.
The classification that spine surgeons use separates adult scoliosis into types, and the degenerative form is Type 1: primary degenerative scoliosis, mostly on the basis of disc and facet joint arthritis affecting those structures asymmetrically, with predominantly back pain symptoms, often accompanied by signs of spinal stenosis or without (Aebi, European Spine Journal, 2005). These curves are often called "de novo" scoliosis — new, developing in adulthood rather than carried over from childhood. The curve is most often in the lower back, where the wear concentrates, and the apex — the most tilted point — is usually in the mid-lumbar spine. A de novo curve is a structural curve developing after skeletal maturity in a previously normal spine (Zaina et al., Journal of Clinical Medicine, 2023).
What it does
Back pain is the predominant symptom. The pain comes from the worn structures themselves — the degenerated disc, the arthritic facet joints — and from the imbalance the curve creates: muscles working harder on one side to hold the spine upright, joints loaded unevenly with every step. The pain is usually in the lower back, and it is often worse with standing and walking, better with sitting and lying down.
Stenosis signs are common. As the curve develops, the canal and the foramina narrow, and the nerves are crowded. Lumbar stenosis brings leg pain with walking — neurogenic claudication, the legs aching and tiring after a distance, easing with rest or with bending forward. A nerve root can be pinched where it exits, giving leg pain that follows the root's pattern. The curve and the stenosis travel together: the same wear that bends the spine also narrows the spaces the nerves pass through.
A sideways slip often accompanies the curve. Lateral listhesis — one vertebra shifting sideways on the one below it — is observed frequently with degenerative scoliosis, and degenerative spondylolisthesis — a forward slip — is common in the same spines. The slip and the curve are two expressions of the same instability: the segment has lost its normal restraint, and it moves in more than one direction. The instability post owns the question of what makes a slip unstable; this piece notes the association and moves on.
How it differs from adolescent scoliosis
The adolescent form is a curve of growth: it appears in childhood or adolescence, in a growing spine, for reasons that are largely unknown, and it is watched through the growth years. The adult degenerative form is a curve of wear: it appears after skeletal maturity, in a previously straight spine, because the discs and facet joints degenerated asymmetrically. The two are different conditions that share a measurement — the Cobb angle — and little else. This piece covers only the adult degenerative form. The adolescent form is a different conversation, for a different clinic.
How it is diagnosed
Standing X-rays are the foundation. The Cobb angle is measured on a full-length standing film, front and back, because the curve is a standing deformity — it looks different lying down, when gravity is not loading it. The films also show the level of the curve, the rotation of the vertebrae, the lateral listhesis, and the balance of the spine front to back — whether the head sits over the pelvis or has drifted forward. MRI shows the nerves: the stenosis, the compressed roots, and the discs. The MRI is read against the X-rays and the examination — the finding, and whether it matches the symptoms.
Bone quality is checked before any fusion is considered. A DEXA scan measures bone density, and the result shapes the surgical plan: weak bone changes the fixation, the construct, and the counseling. Bone quality, not bone strength, is the term — and it is checked as part of the pre-surgery workup, the same way it is checked before any fusion.
Treatment: conservative first, surgery for a reason
Conservative care comes first. Activity, physical therapy, and medication manage the pain; the measures are the same ones the guidelines put first for most back pain. A brace does not straighten an adult curve. Injections sit in the pre-surgical pathway as a step — where they sit, what a response means, when repeats stop — not as a treatment for the curve itself. The curve is a structural change; conservative care treats the symptoms it causes, not the angle.
Surgery is considered when the deformity is progressing, when the pain is not controlled by conservative measures, or when the nerves are affected — claudication that limits walking, a root that stays compressed, weakness that does not recover. The operation is a spinal fusion spanning the curve, straightening and stabilizing it, with decompression of the crowded nerves where they need room. It is a large operation, and the decision weighs the size of it against the symptoms: the pain, the walking distance, the progression, and the bone quality. Surgery should be recommended thoughtfully — not simply because it is technically possible. That standard holds here as it holds everywhere: the fusion is considered for a specific structural reason, never for a curve alone, and never for a number on an X-ray without the symptoms to match it.
Frequently asked questions
What is adult degenerative scoliosis?
A curve that develops in adulthood, in a spine that was previously straight, because the discs and facet joints wear unevenly. Adult scoliosis is defined as a spinal deformity in a skeletally mature patient with a Cobb angle of more than 10 degrees (Aebi, European Spine Journal, 2005). The degenerative form is Type 1 in Aebi's classification: primary degenerative scoliosis, mostly on the basis of disc and facet joint arthritis affecting those structures asymmetrically. These curves are often called "de novo" scoliosis.
Is it the same as the scoliosis children get?
No. The adolescent form is a curve of growth: it appears in childhood or adolescence, in a growing spine, and it is watched through the growth years. The adult degenerative form is a curve of wear: it appears after skeletal maturity, in a previously straight spine, because the discs and facet joints degenerated asymmetrically. The two are different conditions that share a measurement — the Cobb angle — and little else. This piece covers only the adult degenerative form.
What causes the curve?
Asymmetric wear. One side of a disc thins faster than the other, one facet joint becomes arthritic before its partner, and the spine leans toward the worn side. Over years, the lean becomes a curve. The wear is disc degeneration and facet joint arthritis, affecting the structures asymmetrically (Aebi, European Spine Journal, 2005). The curve is most often in the lower back, where the wear concentrates.
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What are the symptoms?
Back pain is predominant — from the worn discs and facet joints, and from the imbalance the curve creates. Stenosis signs are common: leg pain with walking, the legs aching and tiring after a distance and easing with rest, and nerve-root pain where a root is pinched. A sideways slip of one vertebra on the one below — lateral listhesis — often accompanies the curve. Degenerative scoliosis can be painful even at lower degrees (Zaina et al., Journal of Clinical Medicine, 2023).
How is it diagnosed?
Standing X-rays are the foundation: the Cobb angle is measured on a full-length standing film, because the curve is a standing deformity. The films show the level of the curve, the rotation, the lateral listhesis, and the balance of the spine front to back. MRI shows the nerves — the stenosis, the compressed roots, and the discs. Bone quality is checked with a DEXA scan before any fusion is considered.
Will the curve keep getting worse?
It can progress, and the progression is usually slow — measured over years, not weeks. The rate varies from person to person, and it is followed with standing X-rays over time. Progression, pain that is not controlled, or nerves that are affected are the reasons surgery is considered. A curve that is stable, with symptoms that are controlled, is watched rather than operated on.
Can physical therapy straighten the curve?
No. A brace does not straighten an adult curve, and physical therapy does not reverse it. Conservative care — activity, physical therapy, medication — treats the symptoms the curve causes, not the angle. The curve is a structural change. What conservative care does is keep the patient moving, strong, and functional around the curve, and it is the first line for most patients.
When is surgery considered?
When the deformity is progressing, when the pain is not controlled by conservative measures, or when the nerves are affected — claudication that limits walking, a root that stays compressed, weakness that does not recover. The operation is a spinal fusion spanning the curve, straightening and stabilizing it, with decompression of the crowded nerves where they need room. Surgery should be recommended thoughtfully — not simply because it is technically possible. The fusion is considered for a specific structural reason, never for a curve alone.
What is a Cobb angle?
The angle between the most tilted vertebrae at the top and bottom of the curve, measured on a standing X-ray. More than 10 degrees is the threshold at which a sideways bend counts as scoliosis rather than normal variation (Aebi, European Spine Journal, 2005). The angle measures the curve; it does not, by itself, decide treatment. A curve is operated on for its symptoms and its progression, never for a number on an X-ray without the symptoms to match it.
Does bone density matter?
Yes. Bone quality is checked with a DEXA scan before any fusion is considered, and the result shapes the surgical plan: weak bone changes the fixation, the construct, and the counseling. Bone quality, not bone strength, is the term. It is checked as part of the pre-surgery workup, the same way it is checked before any fusion. Medication guidance defers to the patient's pharmacist or primary care doctor.