One leg shorter than the other

Four different things get called a short leg, and only one of them is a leg length difference. The other three are far more common, none of them is fixed with a heel lift, and telling them apart decides everything that follows. Clubfoot is one route into this. The sorting is the same whatever brought you here.

Written by Heath, who has lived it: casts from birth, a fusion at sixteen, the US Army, and distance running.

Which do you mean?

Pick the one that matches what you have noticed

Choose one to see how common it is, how it is measured, and whether it is worth doing anything about.

The foot is smaller

This is by far the most common finding, and it is not a leg length difference at all. A clubfoot (talipes equinovarus outside the United States) is typically shorter, sometimes narrower, sometimes wider through the midfoot, and this is present from birth, not caused by treatment. Half a shoe size to a size and a half is the usual range.

How commonNear universal in one-sided clubfoot. In bilateral clubfoot both feet are smaller, so nothing looks asymmetric.

How to checkMeasure both feet against a wall, standing, at the end of the day. Compare length instead of shoe size, since sizing varies wildly between brands.

Does it matterOnly for buying shoes. It has no effect on how far your hip sits above the floor, which is what leg length means.

What helpsFit the larger foot and fill the smaller one. The footwear page covers split sizing and how to make one pair work for two feet.

The leg bones are shorter

A genuine structural difference, usually in the tibia, and the only one of the four that a heel lift is actually for. It happens in clubfoot, and more often in one-sided cases. In 278 Ponseti-treated children, 14.4 percent had a difference of at least half a centimeter, averaging 1.1 centimeters: 27 percent in one-sided clubfoot against 4.5 percent in both-sided.7

How commonPresent in a minority. Larger discrepancies point toward a syndromic cause or another condition and not isolated clubfoot.

How to checkProperly measured: standing on blocks until the pelvis levels, or imaging such as a scanogram. Not by eye, and not lying on a couch.

Does it matterUnder a centimeter, usually not. Most of the population has that much and never knows. Above two centimeters it starts to affect gait and the spine.

What helpsAn insole or a built-up sole sized to the measurement. In children, growth can be slowed on the longer side; lengthening is reserved for large differences.

It feels shorter when I walk

The commonest reason anyone arrives at this question, and it is usually functional, not structural. The leg is the same length; something about how it meets the ground has changed. A stiff ankle, a heel that tilts inward, weak push-off, or a foot sitting lower in one shoe will all produce exactly this sensation.

How commonVery. It is the default explanation to consider before assuming a bone difference.

How to checkDoes it change with different shoes, or over the course of a day? A structural difference does not. A functional one very much does.

Does it matterYes, but not as a length problem. It usually points at stiffness, weakness or footwear, all of which have their own answers.

What helpsIdentifying the actual driver. The four kinds of limp separates them, and adding a lift to this one reliably makes it worse.

My hips look uneven

A tilted pelvis is a consequence far more often than a cause. Years of standing predominantly on one side, of a hip working harder to clear a stiff foot, and of muscle length differences settling in will tilt a pelvis without any bone being shorter.

How commonFrequent in adults with one-sided clubfoot, and often noticed first by a physiotherapist or a tailor rather than by you.

How to checkHave someone assess it standing and lying. If the tilt disappears lying down, it is postural and not structural.

Does it matterIt can, as a source of one-sided lower back pain. It is worth addressing on its own terms, not as a length problem.

What helpsHip and trunk strength work, and treating whatever is making you favor one side. A lift here can lock the tilt in instead of release it.

Why the heel lift is the wrong first move

It is cheap, it is available in any pharmacy, and it feels like a direct answer to the problem. That combination makes it the most commonly self-prescribed intervention in this whole area, and it is right for exactly one of the four situations above.

Put a lift under a foot whose problem is a stiff ankle, and you have raised the heel of the side that was already struggling to get its heel down. Put one under a functionally short side, and you have taken a compensation the body chose and blocked it. In both cases people describe the same thing afterwards: it felt better for two weeks and then everything hurt more.

Measure first. A lift for an unmeasured difference solves a problem you may not have.

If you do have a measured difference, the lift should be sized to the measurement and introduced gradually, typically starting at half the correction and building over several weeks. A body that has spent thirty years accommodating a difference does not want it removed all at once.

Sorting the four apart

Question	Smaller foot	Shorter bone	Functional
Changes with footwear?	No	No	Yes, markedly
Changes through the day?	No	No	Often
Visible lying down?	Yes	Yes	No
Affects shoe fitting?	Yes	No	No
Heel lift appropriate?	No	If measured	Usually harmful
Responds to strength work?	No	No	Frequently

The row that decides most cases is the first one. A structural difference is indifferent to what you put on your feet; a functional one is not. If swapping shoes changes how level you feel, you are not dealing with bone.

Leg length and clubfoot

How serious is a leg length discrepancy?

Size is most of the answer. Small differences are ordinary: in a series of 220 standing full-length x-rays of adults over 65, 18 percent had a difference of a centimeter or more.8 That paper found a centimeter or more went with uneven arthritis between the two hips, and the work it reviews puts the point where walking mechanics measurably change at around two centimeters.8 The differences that come with clubfoot are almost all below that.

Which hip hurts if one leg is shorter than the other?

The studies disagree, and that disagreement is the honest answer. A 2026 review of 220 full-length x-rays found the worse hip was the one on the shorter leg, and set out the work that contradicts it: one study found the worse hip on the longer leg, another found no strong link at moderate differences.8 What survives across them is the asymmetry rather than a side. If a hip hurts, having the difference measured is reasonable. Predicting which hip a difference will land in is not.

Can a chiropractor fix uneven legs?

Not if the difference is in the bone. A real discrepancy is a length of femur and tibia, and manual treatment does not change that. The other three things on this page are position and soft tissue rather than length, and those are what hands-on treatment can work on. It is worth knowing how uncertain the leg check itself is: a review published in a chiropractic journal found that with a genuine anatomical difference the pelvis rotates the opposite way to the one commonly assumed when practitioners check leg length lying down, and it warned practitioners who set their treatment direction from those checks.9 The test that separates the two is standing on blocks until the pelvis levels. A systematic review of pelvic obliquity reaches the same place: a pelvis that levels with a lift points to the leg, and one that stays tilted points to the spine.10

Should I use a heel lift?

Only after the difference has been measured properly. Adding a lift for a functional or perceived difference commonly makes walking worse instead of better, and it is one of the most frequently self-prescribed and unhelpful interventions.

How is leg length properly measured?

By clinical measurement from the pelvis to the ankle, by standing on blocks until the pelvis levels, or by imaging such as a scanogram. Eyeballing someone lying down is unreliable and should not be the basis for a lift.

Does clubfoot cause one leg to be shorter?

Usually not in the way people mean. The foot is commonly smaller and the calf thinner, and there is often a small difference in tibia length of under a centimeter. A true, functionally significant leg length discrepancy is uncommon in isolated clubfoot.

How much of a difference is normal?

Shoe size differences of half to one and a half sizes are typical in one-sided clubfoot. Actual bone length differences, where present, are usually under a centimeter, which is within the range most people have anyway.

Why do I feel shorter on one side then?

Most commonly it is functional, not structural: a stiff ankle, a heel that tilts, a smaller foot sitting differently in a shoe, or pelvic tilt from years of uneven loading. All of those make one side feel shorter while the bones are the same length.

Does the difference get worse as a child grows?

It can increase slightly with growth, which is why children with a measurable discrepancy are monitored. Most differences remain small and never require treatment beyond a simple insole.

Is the shorter foot the same as a shorter leg?

No, and confusing the two causes a lot of unnecessary worry. A smaller foot affects shoe fitting; it does not change how far the hip sits above the ground, which is what leg length actually means.

How do you fix one leg being shorter than the other?

Small differences are managed with an insole or a built-up sole. Larger ones, which are rare in isolated clubfoot, can be addressed surgically by slowing growth on the longer side in childhood or by lengthening procedures.

Sources

Where this comes from

1 Clubfoot symptoms and causesMayo Clinic 2 Limb length and girth discrepancy of unilateral congenital clubfootPubMed 3 Clinically detected leg length discrepancy in idiopathic clubfootPubMed 4 Leg length discrepancy in unilateral congenital clubfoot after surgical treatmentPubMed Central 5 Leg-length discrepancy and bone age in unilateral clubfootPubMed 6 Development of foot length in children with congenital clubfootPubMed Central 7 Prevalence and Risk Factors for Leg Length Discrepancy in Children With Idiopathic Clubfoot Treated With Ponseti MethodSchaibley et al. J Pediatr Orthop, 2025. PMID 39831627 8 Aprato A, et al. Moderate leg length discrepancy: a long-term risk factor for hip osteoarthritis?Journal of Orthopaedics and Traumatology, 2026 9 Cooperstein R, Lew M. The relationship between pelvic torsion and anatomical leg length inequality: a review of the literatureJournal of Chiropractic Medicine, 2009 10 Truumees E, et al. Differentiating spinal deformity versus leg length discrepancy in patients with pelvic obliquitySpine, 2026

Follow this up

The smaller foot →The finding people mistake for a short leg, in full. Limping →If it feels shorter when you walk, start here instead. Shoes and orthotics →Two different sized feet, handled properly. Found on the 20-week scan →What a prenatal diagnosis does and does not tell you.