Whether you can still grow taller after scoliosis surgery depends on how old you are at the time of the operation and which type of procedure is performed. A traditional spinal fusion locks part of the spine in place, which does limit further growth in that segment, but it also straightens the curve and typically adds several centimeters of height right away. Patients who are still skeletally immature at the time of surgery often continue growing in other ways that partially or fully make up for the fused segment, and newer non-fusion techniques are specifically designed to preserve spinal growth.
The Height You Gain on the Operating Table
One of the first things patients and families notice after scoliosis surgery is that the person is taller. This is not new growth. It is height that was “hidden” inside the curve. A scoliotic spine bends sideways and often rotates, which compresses the trunk vertically. When a surgeon corrects that curve with rods and screws, the spine is straightened and lengthened, restoring height that was being lost to the deformity. In adolescent idiopathic scoliosis, the average height gain from correction alone is roughly 4 to 5 centimeters, though it varies widely depending on how large the curve was and how many vertebrae are involved.1PubMed Central. Change in spinal height following correction of adolescent idiopathic scoliosis Patients with larger preoperative curves tend to gain more height simply because there is more curvature to straighten out. The main Cobb angle before surgery and the number of vertebrae included in the construct are the strongest predictors of how much taller someone will be immediately afterward.2SAGE Journals / PubMed Central. Prediction of height increment using preoperative radiological parameters following selective thoracic fusion with alternate-level pedicle screw construct in Lenke 1 and 2 adolescent idiopathic scoliosis patients
This immediate gain is real and permanent, but it is recovery of lost height rather than new growth. The distinction matters because families sometimes assume the surgery itself “makes you grow.” It does not. It mechanically restores length to a compressed trunk.
Spinal Growth After a Posterior Fusion
A spinal fusion welds selected vertebrae together using bone graft so they heal into a single solid block. Once that block is solid, those vertebrae will not grow longer, and the discs between them gradually lose height over time. Research on skeletally immature adolescents who underwent posterior fusion found that the disc spaces within the fused segment shrank substantially in the years after surgery, with the front portion of the disc losing close to half its height and the back portion losing about a third.3The Journal of Bone and Joint Surgery. British volume. Vertebral growth after posterior spinal fusion for idiopathic scoliosis in skeletally immature adolescents. The effect of growth on spinal deformity In practical terms, a fused spine segment does not contribute meaningfully to further height.
But “the fused segment doesn’t grow” is not the same as “the patient doesn’t grow.” A typical adolescent scoliosis fusion spans perhaps 10 to 12 of the spine’s 24 mobile vertebrae. The segments above and below the fusion remain unfused and continue growing normally if the patient is still maturing. More importantly, the spine is only one contributor to overall standing height.
The Crankshaft Phenomenon
In younger patients, the vertebrae have growth plates on both their front and back surfaces. A standard posterior fusion locks the back of the spine, but if the front growth plates are still active, they can keep producing new bone. When the back is locked and the front keeps growing, the vertebrae can rotate and twist in a corkscrew-like motion called the crankshaft phenomenon.4PubMed. The Crankshaft Phenomenon This continued anterior growth does not produce useful height gain. Instead, it distorts the correction, causing the spine to rotate further and the rib prominence to worsen over time.5PubMed Central. The progress of research on crankshaft phenomenon
The crankshaft phenomenon is a major reason surgeons pay close attention to skeletal maturity before deciding on a fusion. In a patient who is nearly done growing, the risk is low. In a child with years of growth ahead, locking the back of the spine without addressing the front can create new problems. This is one of the key trade-offs that drives the choice of surgical technique.
How Your Legs Make Up the Difference
Here is a finding that surprises most people: girls who had spinal fusion for adolescent idiopathic scoliosis ended up at essentially the same standing height as girls treated with a brace alone. Their spines were measurably shorter, but their legs were measurably longer.6PubMed. Effect of spinal fusion on growth of the spine and lower limbs in girls with adolescent idiopathic scoliosis: a longitudinal study The leg-to-arm ratio in the fusion group kept increasing after surgery, suggesting the body was compensating for reduced spinal growth with additional lower-limb growth.
This compensatory pattern has been observed in more than one study. A separate analysis confirmed that fusion did shorten spinal length but that the loss was offset by increased leg length, so that final standing height was comparable to non-fused patients.7Scientific Reports. Factors favoring regain of the lost vertical spinal height through posterior spinal fusion in adolescent idiopathic scoliosis The mechanism behind this is not completely understood, but one theory is that growth hormone and growth plate activity redistribute in response to altered mechanical loading on the spine. Whatever the reason, the practical result is reassuring: if you are an adolescent who has not finished growing, fusion is unlikely to leave you shorter than you would have been. Your body proportions shift slightly, with a longer leg-to-trunk ratio, but your overall height ends up in the same neighborhood.
This finding does come with a caveat. Most of the research involves girls with adolescent idiopathic scoliosis, who tend to have surgery in their early to mid-teens when meaningful leg growth remains. The compensation may be less complete in patients who are closer to skeletal maturity or who have very long fusions. Still, the general pattern is well-documented enough to be part of the conversation surgeons have with families before surgery.
Skeletal Maturity and Why the Timing Matters
The single biggest factor in whether you will keep growing after any scoliosis surgery is how skeletally mature you are at the time. Surgeons use several methods to assess this, the most common being the Risser sign (based on how much the iliac crest has ossified) and newer systems that look at the bones of the hand and wrist. A simplified skeletal maturity staging system based on the hand has been shown to correlate more strongly with scoliosis behavior than the Risser sign alone.8PubMed. Predicting scoliosis progression from skeletal maturity: a simplified classification during adolescence
Peak spinal growth tends to align with earlier stages of skeletal maturity, well before the Risser sign reaches its higher grades. Research looking at multiple maturity markers found that peak growth corresponded to relatively early maturity stages, while the growth plateau did not begin until much later stages.9PubMed Central. Does the Use of Sanders Staging and Distal Radius and Ulna Classification Avoid Mismatches in Growth Assessment with Risser Staging Alone? This matters for surgical planning because a patient at peak growth velocity has a very different risk profile than one nearing their growth plateau. Operating too early on a rapidly growing child with a standard fusion risks the crankshaft problem. Waiting too long can allow a severe curve to progress and become harder to correct.
For families, the takeaway is that your surgeon’s assessment of where you are on the growth curve is not just a formality. It directly affects which surgery is recommended, when it happens, and how much natural growth you can expect afterward.
Growth-Friendly Implants for Young Children
Children who develop severe scoliosis very early, sometimes before age 5, present a unique challenge. Their spines are far from done growing, and a full fusion at that stage would severely stunt trunk height and compromise lung development. For these patients, surgeons use growth-friendly systems designed to control the curve while allowing the spine to keep lengthening.
Traditional growing rods are the oldest approach. Metal rods are attached to the spine above and below the curve, and every six to nine months the child has a brief surgery to lengthen the rods. This maintains about 40 to 50 percent correction of the curve while allowing near-normal spinal growth to continue.10PubMed Central. Standard and magnetically controlled growing rods for the treatment of early onset scoliosis The obvious drawback is the repeated surgeries, each carrying its own risks of infection and anesthesia.
Magnetically controlled growing rods avoid those repeat operations by using an internal magnet that can be lengthened from outside the body using a handheld device in a clinic visit. Studies of these devices have shown meaningful spinal growth over time. In one large multicenter study, the average thoracic spine length increased from about 18 cm before surgery to nearly 22 cm at the most recent follow-up, and total spine length from the top of the thoracic region to the pelvis grew from about 30 cm to 35 cm.11Journal of Pediatric Orthopaedics. Preliminary Results of Magnetically Controlled Growing Rods for Early Onset Scoliosis The ongoing lengthening rate averaged about 0.7 mm per month, which is a reasonable approximation of normal growth in this age group.
A systematic review across different growth-friendly systems found that initial surgical correction alone accounted for about 3.9 cm of spinal length gain, and additional “true” growth achieved between the initial procedure and eventual definitive fusion averaged about 0.6 cm per year for the full spine.12PubMed Central / Elsevier. A comparison of growth among growth-friendly systems for scoliosis: a systematic review That rate is slower than normal growth, but far better than the alternative of early fusion, and it accumulates over years of treatment.
Vertebral Body Tethering as an Alternative
For adolescents who still have substantial growth remaining, vertebral body tethering is a newer approach that aims to correct the curve without fusing any vertebrae. A flexible cord is attached to screws placed on the convex side of the curve (the outside of the bend). As the child grows, the tether compresses the convex growth plates while allowing the concave side to grow normally, gradually straightening the spine over time. The concept borrows from a well-established principle in orthopedics: applying compression to one side of a growth plate slows growth there, while the opposite side continues growing, producing a gradual correction.13PubMed Central. Vertebral Body Tethering: Indications, Surgical Technique, and a Systematic Review of Published Results
The growth advantage of tethering over fusion is striking. In one comparative study matching similar patients, adolescents treated with tethering gained an average of 15 cm in height over the follow-up period compared to 9 cm in the fusion group.14PubMed Central. Vertebral body tethering: An alternative to posterior spinal fusion in idiopathic scoliosis? Another matched comparison found that the tethered group continued growing in the thoracic spine and across the instrumented levels, while the fusion group showed no growth over the instrumented segment.15PubMed. Vertebral body tethering compared to posterior spinal fusion for skeletally immature adolescent idiopathic scoliosis patients: preliminary results from a matched case-control study
That said, tethering is not a universal replacement for fusion. It works best for moderate curves in patients with enough growth remaining for the modulation effect to kick in. The correction it achieves is less complete than fusion, and revisions are more common. About half the tethered patients in one comparative study ended up with residual curves under 35 degrees, compared to all patients in the fusion group meeting that benchmark.14PubMed Central. Vertebral body tethering: An alternative to posterior spinal fusion in idiopathic scoliosis? Tethering trades some precision of correction for the preservation of spinal motion and growth. For the right candidate, that trade-off can be worthwhile.
Why Early Fusion Can Affect Lung Development
The question of growth after scoliosis surgery is not just about height. For very young children, the thoracic spine and rib cage are still developing together, and normal lung growth depends on having enough room inside the chest. Fusing a large portion of the thoracic spine before about age eight can severely restrict that chest growth. Thoracic height after early fusion is on average only about half of what is seen in children with scoliosis who do not have early surgery, and reduced thoracic height correlates directly with decreased lung capacity.16PubMed Central. Early Definitive Spinal Fusion in Young Children: What We Have Learned Restrictive lung disease, defined as lung capacity falling below half of normal, occurs in roughly 43 to 64 percent of patients who undergo early extensive thoracic fusions.
Fusing half or more of the thoracic spine before age seven has been specifically linked to the development of thoracic insufficiency syndrome, where the chest simply cannot support normal breathing.17PubMed Central. Normal and abnormal spine and thoracic cage development This is the main reason growth-friendly systems exist for young children. Delaying a definitive fusion until the chest has had enough time to develop is a critical goal of treatment in early-onset scoliosis. The spine continues to grow during this delay, and the lungs have the space they need to reach adequate capacity.
Adult Scoliosis Surgery and Height Changes
For adults, growth is no longer on the table, but height changes after surgery are still a real phenomenon. Correcting a degenerative or longstanding scoliotic curve straightens the trunk and can restore centimeters of height that were being lost to the curvature. However, adult deformity surgery also involves trade-offs in pelvic and spinal alignment that can work against height gain. A study of adults who underwent long-segment circumferential fusion for spinal deformity found that over half actually lost spinal height postoperatively, and changes in pelvic alignment were a significant contributor to that loss.18Asian Spine Journal. Determinants of Postoperative Spinal Height Change among Adult Spinal Deformity Patients with Long Construct Circumferential Fusion
The variability in adult outcomes is wide, ranging from losing several centimeters to gaining them. This is because adult spinal deformity correction involves balancing many competing goals: straightening the curve, restoring sagittal balance (the front-to-back alignment of the spine), and achieving a stable position that the muscles can support. Sometimes achieving good overall alignment means accepting a position that is not the tallest possible one. For adults, the primary goals of surgery are pain relief and functional improvement rather than height restoration, though a straighter spine does often come with a welcome few centimeters.
Body Image and the Meaning of Height After Surgery
Height is rarely the main reason anyone has scoliosis surgery, but it is often on patients’ minds, especially adolescents. A scoping review of body image in adolescents with idiopathic scoliosis found that body image dissatisfaction was common, with more severe curves linked to greater dissatisfaction. Surgery tended to improve body image outcomes, though the improvements did not always line up neatly with measurable changes in curve size or trunk shape.19SpringerLink. Body Image and Body Schema in Adolescents with Idiopathic Scoliosis: A Scoping Review A patient with a modest residual curve might feel much better about their appearance simply because the rib hump is less visible or because they stand taller. Conversely, a patient with an excellent radiographic correction might still feel dissatisfied if their expectations centered on a specific height goal that was not realistic.
The disconnect between clinical measurements and how patients feel about their bodies is worth understanding before surgery. Surgeons can give reasonable estimates of how much height the correction will restore, but growth predictions are inherently uncertain, and final standing height is only one part of a bigger picture that includes trunk symmetry, shoulder balance, and the way clothes fit. Patients who go in understanding that tend to come out more satisfied.
Proportional Changes That Persist
Even when overall standing height ends up where it would have been without surgery, body proportions can shift noticeably. As discussed, spinal fusion tends to produce a shorter trunk and relatively longer legs. For most people this is cosmetically negligible, but it can show up in practical ways: pants might fit differently relative to shirts, or a patient might notice they sit shorter than peers of the same standing height. These proportional shifts are a natural consequence of altering spinal growth while leg growth continues unimpeded.
Patients who undergo growth-friendly or fusionless procedures tend to end up with more typical trunk-to-leg ratios because spinal growth was preserved throughout treatment. Whether this matters enough to influence the choice of procedure depends on many factors, including how severe the curve is, how much growth remains, and what the surgical risks of each option look like. No one should choose a riskier procedure solely for a more proportional silhouette, but the proportional outcome is a legitimate piece of the decision-making conversation.