Adult Spinal Deformity
When a curved or misaligned spine causes pain, nerve compression, or difficulty standing upright — surgical correction can restore balance and relieve symptoms.
Scoliosis is an abnormal lateral curvature of the spine, but in adults the problem is rarely the curve alone. Most adults seeking treatment have nerve compression from narrowed canals and foramina at the deformed levels, sagittal imbalance (a forward lean that makes standing exhausting), or both. The curve is the structural cause; the symptoms — leg pain, claudication, back pain, and progressive inability to stand upright — are what drive patients to surgery.
Adult scoliosis surgery addresses all three dimensions of the deformity: the side-to-side curve (coronal alignment), the forward-backward balance (sagittal alignment), and the rotational component. Restoring balance across all three planes is what distinguishes deformity surgery from a straightforward lumbar fusion.
De novo — develops in adulthood
Develops after age 40–50 as asymmetric disc and facet degeneration causes the lumbar spine to shift and tilt. Often associated with spinal stenosis, neurogenic claudication, and leg pain. Typically affects the lumbar spine.
Most common type seen in adult surgical candidates.
Adolescent curve that persists or progresses
A curve present since adolescence that was untreated or observed, and has progressed in adulthood — particularly after age 50 when bone density decreases. May involve the thoracic and lumbar spine.
Often presents with back pain, cosmetic concerns, and, in large curves, cardiopulmonary compromise.
The decision to operate on adult scoliosis is not made based on curve angle alone. Most surgeons use a combination of factors:
Factors that support surgical evaluation
Conservative measures to try first
A curve measured at 30° or 40° does not automatically indicate surgery. Many patients with large curves live comfortably without intervention. Symptoms, function, and trajectory — not the number alone — drive the decision.
Adult deformity surgery is one of the most technically demanding procedures in spine surgery. Most operations use a posterior approach with pedicle screw and rod instrumentation to correct and stabilize the deformed segment. Depending on your anatomy, additional elements may be required:
The length of fusion — how many vertebral levels are included — is one of the most important surgical planning decisions. A short construct corrects fewer levels but carries lower risk; a longer construct achieves better overall balance but is a more demanding operation. Your surgeon will use full-length standing X-rays and specialized balance measurements (SVA, PT, PI-LL) to determine the optimal construct length for your specific deformity.
Physical therapy, injections, and pain management. Surgery is considered only after these have been adequately tried unless neurological deterioration is occurring.
Full-length standing scoliosis X-rays (36-inch cassette) to measure curve angles and spinal balance parameters. MRI to assess nerve compression at each level. Bone density (DEXA scan) to evaluate fusion risk. Pulmonary function if thoracic curve is large. Medical optimization — cardiac clearance, blood pressure control, nutritional status — for major surgery.
Determination of fusion levels, approach strategy, need for osteotomies, and whether a staged procedure (multiple operations) is appropriate. Neuromonitoring (SSEP/MEP) is planned for intraoperative spinal cord protection.
Posterior approach with pedicle screw instrumentation across the planned levels. Decompression at stenotic levels. Osteotomies if needed for rigid or severe deformity. Rod placement and curve correction under continuous neuromonitoring. Bone graft placement for fusion.
Physical and occupational therapy begin day one. Pain is managed with a multimodal protocol. Most patients are walking with assistance by post-operative day one or two.
Outpatient physical therapy resumes at 4–6 weeks. Fusion is monitored with X-rays at 3, 6, and 12 months. Full activity clearance typically at 9–12 months when solid fusion is confirmed.
Adult deformity surgery carries meaningful risk precisely because the potential benefit is also meaningful — restoring the ability to walk, stand, and function independently. The evidence supports significant improvement in pain and function for well-selected patients.
Outcomes vary significantly with curve severity, patient age, bone density, and number of levels fused. The figures above reflect published literature on adult degenerative scoliosis; individual results may differ. A detailed informed consent discussion — including specific complication risks for your anatomy — will take place before any surgical decision.
Adult scoliosis has two main origins. De novo degenerative scoliosis develops in adulthood — typically after age 50 — when asymmetric disc and facet joint degeneration causes the spine to gradually shift and tilt. Adult idiopathic scoliosis is a curve that was present in adolescence and either was not treated or has since progressed. In adults, symptoms are usually driven by nerve compression (leg pain, claudication, weakness) in addition to back pain, making it distinct from the predominantly cosmetic concern in adolescents.
Curve magnitude alone does not determine whether surgery is appropriate. In adults, the decision is based primarily on symptoms — how much back and leg pain you have, how far you can walk, whether you lean forward when standing, and how much function you've lost. A 30-degree curve causing severe neurogenic claudication may warrant surgical discussion. A 45-degree curve in a largely asymptomatic person may not. Your surgeon will review full-length standing X-rays, MRI findings, and your symptom burden together before recommending surgery.
Surgery length and recovery depend on how many levels are fused. A short correction (3–4 levels) may take 3–4 hours; a long construct from the thoracic spine to the pelvis may take 6–8 hours. Hospital stays are typically 2–5 days. Most patients return to desk work in 4–8 weeks and reach full recovery at 6–12 months, when fusion is solid. Major activity restrictions are maintained until fusion is confirmed on imaging.
A standard lumbar fusion treats 1–2 levels in a spine that is otherwise well aligned. Scoliosis surgery addresses abnormal three-dimensional alignment — lateral curve, rotational deformity, and sagittal imbalance — often across 5–12 or more levels. It requires rod contouring, precise screw angles, and sometimes bone cuts (osteotomies) to restore spinal balance. It is a longer, more complex operation with a more involved recovery and a different risk profile.
MIS techniques work well for selected cases — particularly shorter degenerative curves with primarily axial and radicular symptoms rather than large three-dimensional deformities. A hybrid approach combining MIS interbody fusion at lower levels with a shorter open posterior construct is another option. Severe deformity, significant sagittal imbalance, or the need for osteotomies generally requires an open approach. Your surgeon will review your imaging to determine whether MIS is feasible for your specific curve.
Risks include general surgical complications (infection, bleeding, anesthetic issues) plus deformity-specific concerns: pseudarthrosis (non-union), hardware failure (rod fracture, screw loosening), junctional kyphosis (new deformity at the top or bottom of the construct), and — rarely — neurological deficit. These risks are managed through careful planning, continuous intraoperative neuromonitoring, and staged approaches when appropriate. Your individual risk profile will be reviewed in detail before any surgical decision.
The goal is a balanced, stable spine that relieves symptoms and allows comfortable standing and walking — not necessarily a perfectly straight spine. In adults, the spine and soft tissues have adapted to the deformity over years, and attempting aggressive correction can increase neurological risk. Surgeons aim for functional correction that restores coronal and sagittal balance. Some residual curve often remains after surgery, and this is expected.
Yes — unless there is rapid curve progression, developing neurological deficit, or severe deformity, conservative measures are always tried first. Physical therapy, epidural steroid injections, pain management, and activity modification are all appropriate starting points. Surgery is considered when these have failed to provide acceptable relief after an adequate trial. Your consultation will review what you've already tried and whether additional conservative options remain before discussing surgery.
Living With a Curved Spine?
Adult scoliosis surgery is a major decision that deserves a thorough evaluation. A consultation includes reviewing your imaging, understanding your symptom history, and giving you a clear picture of your options — including doing nothing.
Adult scoliosis surgery is a significant undertaking — and it's not right for everyone. A consultation will give you a clear, honest picture of whether surgery makes sense for your curve, your symptoms, and your life.
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