Shoe Lifts and Heel Lifts for Scoliosis: When a Lift Helps, When It Hides the Problem, and How Dr. Justin Dick Decides in Charlotte

By Dr. Justin Dick, DC · Clear Life Scoliosis and Chiropractic Center, Charlotte, NC · Published October 14, 2026

A shoe lift can resolve a functional lumbar curve caused by a true leg length difference. It does not correct a structural idiopathic scoliosis, and a lift prescribed from a supine leg check, without standing imaging, can treat the wrong problem.

I am Dr. Justin Dick, and I see patients at Clear Life Scoliosis and Chiropractic Center in Charlotte, NC, who arrive already wearing a lift, or who were told a lift would fix their curve. Sometimes it was the right call. Often nobody measured whether the leg length difference was anatomic, functional, or large enough to matter. This post covers what the evidence supports.

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Anatomic Versus Functional Leg Length Difference

Gary Knutson's two-part review in 2005 is still the clearest summary I know. An anatomic leg length inequality is a real difference in bone length. A functional, or unloaded, leg length asymmetry is an apparent difference seen with the patient lying down, often from muscle tone above the pelvis, with no difference in bone length.

Two findings from that review shape how I practice. First, anatomic inequality measured by reliable X-ray methods was present in about 90 percent of people, with a mean of 5.2 mm. Small differences are normal. Second, for most people anatomic inequality did not appear clinically significant until it reached about 20 mm, roughly three quarters of an inch. Knutson also recommended addressing a functional asymmetry before treating any anatomic one. A leg that looks short on the table may not be short at all.

When a Lift Changes the Curve

When a true leg length difference tilts the pelvis, the lumbar spine bends to compensate, with the convexity usually toward the short side. Raczkowski and colleagues treated 369 children with this kind of functional scoliosis using external or internal shoe lifts. Most discrepancies were 1 cm. At the first follow-up, within two weeks, 83.7 percent showed correction of the curve, and another 14.7 percent corrected later. The authors stressed that discrepancies under 2 cm should be measured standing, using blocks, with attention to the posterior superior iliac spines. That study has no control group and comes from one center, so it supports the mechanism more than it proves long-term benefit.

The 2026 Spine systematic review by Truumees and colleagues reached the same practical conclusion from a different direction. A block or lift test on standing imaging was the most useful way to tell whether pelvic obliquity came from the leg or the spine. A lumbar curve that resolves with the lift suggests the leg. One that persists suggests the spine.

When a Lift Does Not Help

A structural idiopathic curve is a rotational deformity of the spine itself. My post on spinal rotation in scoliosis explains why. Leveling the pelvis does not untwist those vertebrae. A lift can still be part of the plan when a real leg length difference coexists with a structural curve, which the Truumees review identified as the hardest group to manage. In those mixed cases the lift addresses the pelvis, and the structural curve still needs its own plan.

There is also a way a lift can make things worse. Some lumbar and thoracolumbar curves produce pelvic obliquity from above. The spine tilts the pelvis, not the reverse. Adding a lift on the wrong side, or for a difference that is not anatomic, adds an asymmetry the patient did not have. This is why I do not prescribe lifts from a supine leg check alone.

How Dr. Justin Dick Decides on a Lift at Clear Life

At our Charlotte office the decision runs in this order:

1. Clinical examination, including standing pelvic landmarks and a check for functional, unloaded asymmetry.
2. Standing radiographs that show the femoral heads and the lumbar spine, so pelvic obliquity and leg length can be measured on the same film as the curve.
3. A repeat standing view with a lift or block of measured thickness under the short side, when the first film suggests a leg length contribution.
4. A lift only when the imaging shows that leveling the pelvis improves the lumbar curve or the pelvic obliquity, sized to what the film shows rather than to the full measured difference by default.
5. Follow-up imaging to confirm the change held.

For growing children the structural question comes first, because a structural curve in a growth window has a progression risk that a lift will not address. Our pages on adolescent scoliosis treatment and adult scoliosis cover what comes next once the curve type is known.

Comparison

Research and Evidence

The leg length literature is weaker than the confident advice around it. Knutson 2005 is a narrative review, not a meta-analysis, and the 20 mm figure is an approximation drawn from heterogeneous studies. Raczkowski 2010 is an uncontrolled series. The Truumees review is systematic, but its included studies were too heterogeneous to pool. I hold these as reasons for careful testing, not as rules that apply to every patient.

My published work on scoliosis outcomes uses standing radiographs with consistent positioning, which is the same discipline lift decisions require. The geriatric kinetic chain case series, Radiographic Sagittal Alignment and Kinetic Chain Alterations in Geriatric Patients With Scoliosis: A Case Series (Cureus, 2026, PMID 42037873), looks at how compensation through the kinetic chain, including the pelvis and lower extremities, relates to pain in older patients with scoliosis. The 13-month follow-up case, Reduction of Adolescent Idiopathic Scoliosis: A 13-Month Follow-Up (Cureus, 2025, PMID 40062184), documents a structural curve treated with a multimodal plan, which is the kind of curve a lift alone would not change.

References

1. Knutson GA. Anatomic and functional leg-length inequality: a review and recommendation for clinical decision-making. Part I. Chiropr Osteopat. 2005;13:11. doi:10.1186/1746-1340-13-11
2. Knutson GA. Anatomic and functional leg-length inequality: a review and recommendation for clinical decision-making. Part II. Chiropr Osteopat. 2005;13:12. doi:10.1186/1746-1340-13-12
3. Raczkowski JW, Daniszewska B, Zolynski K. Functional scoliosis caused by leg length discrepancy. Arch Med Sci. 2010;6(3):393-8. doi:10.5114/aoms.2010.14262
4. Truumees E, Akkihal K, Griffin J, et al. Differentiating spinal deformity versus leg length discrepancy in patients with pelvic obliquity: systematic review of diagnostic methods, imaging, and clinical management. Spine. 2026;51(12):E301-E312. doi:10.1097/BRS.0000000000005683
5. Whelan JP, Dick JM. Radiographic sagittal alignment and kinetic chain alterations in geriatric patients with scoliosis: a case series. Cureus. 2026;18(3):e105827. doi:10.7759/cureus.105827
6. Dick JM, Spurgeon S. Reduction of adolescent idiopathic scoliosis: a 13-month follow-up. Cureus. 2025;17(2):e78669. doi:10.7759/cureus.78669

Frequently Asked Questions

Service Area

Clear Life Scoliosis and Chiropractic Center sees patients from Charlotte NC, Huntersville NC, Ballantyne NC, Matthews NC, Concord NC, Mooresville NC, Rock Hill SC, Fort Mill SC. Families from across the Charlotte region and the South Carolina border communities come to the Rachel Freeman Way office for radiographic scoliosis evaluation with Dr. Justin Dick.

Related Pages

• Postural vs Structural Scoliosis
• Types of Scoliosis
• Scoliosis Imaging and Measurement
• Radiographic Imaging Credentials
• Scoliosis Progression and Compensation
• Kinetic Chain Dysfunction in Geriatric Scoliosis
• Adult Scoliosis
• Adolescent Scoliosis Treatment
• Treatment Options
• Dr. Justin Dick Research

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If you or your child already wear a lift and nobody has shown you a standing film with and without it, that comparison is worth making. Dr. Justin Dick can do it at our Charlotte office.

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