Blog · 2026-10-20

Shortening vs Lengthening: Leg Length Discrepancy Treatment in Adults

PUBLISHED 2026-10-20 · Live Taller Now

Medically reviewed by Op. Dr. Serdar Karaman, Orthopedics & Traumatology
Live Taller Now, Istanbul · October 2026

A doctor holding up a leg X-ray while discussing it with a patient in a consultation room

If one of your legs is measurably longer than the other and you have finished growing, surgery can even them out in one of two ways: shorten the longer leg, or lengthen the shorter one. Both are established forms of leg length discrepancy treatment in adults, and both rely on the same basic fact that bone heals.

The difference is in what each one asks of you. Shortening is a single operation, but it leaves you at the height of your shorter leg. Lengthening keeps your height, but it takes months of gradual adjustment and follow-up. This guide compares the two side by side, explains which kind of difference each one suits, and ends with the questions that settle the choice with your surgeon.

Shortening vs lengthening at a glance

Both procedures cut a bone. What happens next is what separates them.

	Shortening the longer leg	Lengthening the shorter leg
What is done	A section of bone is removed from the longer leg, and the ends are held with a rod or with plates and screws while they heal	The bone of the shorter leg is cut and the two ends are drawn apart gradually, so new bone fills the gap
When legs become equal	In the operating room	Gradually, at about 1 mm per day (roughly 1 inch a month)
How much it can correct	Limited by the muscles: published maximums are about 3 inches (7.6 cm) in the thigh bone and 2 inches (5 cm) in the shin bone	Larger differences: our surgeon usually corrects 2 to 8 cm this way
Main healing period	One bone cut heals; our patients usually walk without aids by weeks 6 to 10	Weeks of daily lengthening, then months of bone hardening
Your final height	Equal to your shorter leg	Equal to your longer leg
Main risks	Muscle weakness if too much is removed; delayed healing; blood clots; infection	Pin-site infection with external frames; joint stiffness; slight over- or under-correction; new bone that is slow to harden

Sources for the table: the American Academy of Orthopaedic Surgeons (AAOS) and the University of Washington for the procedures, limits, rate and risks; our own published protocols for the recovery milestones and correction range.

When does a leg length difference need surgery?

Most do not. Small differences are common: Yale Medicine notes that up to 35% of adults have a difference of 0.5 to 1.5 cm. According to the AAOS, when the difference is under 2 cm and there is no angular deformity, treatment is usually nonsurgical.

Surgery comes into the conversation as the difference grows. The University of Washington notes that symptoms can appear once the difference reaches about 3.5 to 4% of total leg length, which is roughly 4 cm in an average adult.

Before any decision, the difference has to be confirmed as a true difference in bone length, measured on standing X-rays of the whole leg. Shortening and lengthening only correct a bony difference. Our guide to how leg length discrepancy is measured and corrected explains that first step in detail.

Shortening the longer leg: how it works and who it suits

In a shortening operation, the surgeon removes a measured section from the middle of the longer bone, brings the ends together and fixes them, usually with an internal rod or with plates and screws. Because the section is taken out in one step, your legs are equal when you leave the operating room. Yale Medicine describes this acute shortening as a treatment for people who have stopped growing.

The amount that can be removed is limited, because the muscles do not shorten with the bone. The AAOS gives maximums of about 3 inches (7.6 cm) in the thigh bone (femur) and 2 inches (5 cm) in the shin bone (tibia), and warns that a major shortening may weaken the leg's muscles. Many surgeons stay well inside those figures. Our surgeon's working limit is about 5 cm in the femur and 2 to 3 cm in the tibia.

Recovery centers on one healing bone. At our clinic, patients usually stay in hospital for 3 to 4 nights, protect the leg for about 6 weeks, walk without aids between weeks 6 and 10, and rebuild strength over months 3 to 6. Our page on limb shortening surgery covers the operation and recovery in full.

Shortening tends to suit you if:

you have finished growing
your difference is within the amount that can safely be removed from that bone
you prefer one operation and a single healing period
you accept ending up at the height of your shorter leg

If your goal is to be shorter rather than to even out your legs, that is a different question, covered in can you get shorter?

Lengthening the shorter leg: how it works and who it suits

Lengthening works the other way. The surgeon cuts the bone of the shorter leg and fits a device that draws the two ends apart a little at a time. According to the AAOS, lengthening with an external frame begins about 5 to 10 days after surgery and proceeds at about 1 mm per day, roughly an inch a month. New bone forms in the gap, then has to harden before the leg can carry full weight.

The device is either an external frame, attached to the bone with pins or wires, or an internal expandable rod (nail) lengthened with an external magnet. The AAOS notes that an internal rod carries less risk of infection, because no external frame is used.

Time is the main trade-off. The AAOS says an external frame usually stays on for about 3 months for each inch gained. Our surgeon plans on about 10 days of lengthening per centimeter, then roughly a month of bone hardening per centimeter. For a 4 cm difference, that means about 40 days of lengthening followed by around four months of consolidation, with regular X-rays throughout.

In return, lengthening keeps your height and can correct larger differences than shortening. For leg length discrepancy, our surgeon usually corrects 2 to 8 cm. Our page on limb lengthening surgery compares the devices, and our guide to how limb lengthening works explains each phase.

Lengthening tends to suit you if:

your difference is larger than can safely be removed from the longer leg
you want to keep your height
you can commit to months of follow-up, X-rays and physiotherapy

The trade-offs that decide it

For a given patient, the choice usually comes down to five questions.

How big is the difference?

This is the first filter. The AAOS notes that shortening cannot be used for very large differences, and that lengthening is usually reserved for very large ones. In between, both may be possible, and the other four questions decide it.

Which bone is short?

A difference can sit in the thigh bone, the shin bone or both, and the safe limits differ between them. Shortening is done on the longer leg and lengthening on the shorter one, so ask which leg and which bone your surgeon would operate on, and why.

How much does your height matter to you?

Shortening evens your legs at the length of the shorter one. Lengthening evens them at the length of the longer one. The difference in final height equals the amount being corrected.

How much time can you give it?

Shortening asks for one healing period. Lengthening adds weeks of daily adjustment and months of consolidation, with more appointments along the way.

Which risks matter most to you?

Shortening's main concern is muscle strength, which is why the amount removed is limited. Lengthening's concerns are linked to the long process: pin-site infection with external frames, joint stiffness and new bone that is slow to harden. Our article on limb lengthening side effects explains how each is managed.

What if you are still growing?

Teenagers who are still growing have a third option. Epiphysiodesis slows or stops growth at the growth plate of the longer leg, so the shorter leg can catch up. The AAOS explains that the growth plates must still be open, and that timing is planned from growth charts so that the legs reach equal length when growth ends, on average around age 14 for girls and 16 for boys.

The AAOS lists two drawbacks: a slight over- or under-correction is possible, and adult height ends up slightly less than it would otherwise have been. This decision belongs with a pediatric orthopedic specialist. Live Taller Now treats adults, and considers patients under 18 only in exceptional cases.

Questions to ask your surgeon

Take these to your consultation and ask for the answers in writing:

Is my difference a true difference in bone length, and what do my standing X-rays show?
Is the difference in my thigh bone, my shin bone or both?
Is my difference within the amount that can safely be removed from the longer leg?
How tall will I be after each option?
If you recommend lengthening, which device would you use, and why?
When can I put full weight on the leg, and when can I walk without aids?
How often will I need X-rays and check-ups, and where will they happen?
What happens if the correction ends up slightly over or under target?

Frequently asked questions

Is it better to shorten the longer leg or lengthen the shorter one?

Neither is better for everyone. Shortening is a single operation with one healing period, but it is limited in size and leaves you at the height of your shorter leg. Lengthening keeps your height and corrects larger differences, but takes months. The size of the difference, the bone involved and your priorities decide it.

How much leg length difference can shortening correct?

The AAOS gives maximums of about 3 inches (7.6 cm) in the thigh bone and 2 inches (5 cm) in the shin bone, because removing more may weaken the leg muscles. Our surgeon works within about 5 cm in the femur and 2 to 3 cm in the tibia. Larger differences are usually treated by lengthening.

Will shortening my longer leg make me shorter?

Yes. Shortening evens your legs at the length of the shorter one, so you end up at that height. Lengthening evens them at the length of the longer one. The difference in final height between the two options equals the amount being corrected.

Which recovers faster, shortening or lengthening?

Shortening, as a rule. The legs are equal after one operation, and our shortening patients usually walk without aids between weeks 6 and 10. Lengthening adds about 10 days of daily adjustment and roughly a month of bone hardening for each centimeter gained.

At what leg length difference do adults consider surgery?

According to the AAOS, differences under 2 cm with no angular deformity are usually treated without surgery. The University of Washington notes that symptoms can appear at about 4 cm in an average adult. Above about 2 cm, a surgeon may discuss shortening or lengthening once standing X-rays confirm a true difference.

Can adults have epiphysiodesis?

No. Epiphysiodesis works by slowing growth at the growth plates of the longer leg, so the AAOS notes that the growth plates must still be open. Once you have stopped growing, the surgical options are shortening the longer leg or lengthening the shorter one.

Not sure which option fits your difference?

Send your standing leg X-rays for a free review by Op. Dr. Serdar Karaman in Istanbul. You will get the measured difference, which bone it sits in, and an honest view on whether shortening, lengthening or no surgery suits you, with a fixed written quote within 48 hours.

Get my discrepancy reviewed

Sources

Only the AAOS page is linked in the article. The other sources are listed for reference.

American Academy of Orthopaedic Surgeons (AAOS), OrthoInfo. Lower Limb Length Discrepancy. Reviewed by the Pediatric Orthopaedic Society of North America.
University of Washington Department of Orthopaedics and Sports Medicine. Limb Lengthening & Shortening.
Yale Medicine. Limb Length Discrepancy.
Live Taller Now published protocols: shortening limits and recovery milestones; lengthening rate, consolidation and correction range.

This article is general medical information and does not replace a consultation with a qualified surgeon.