Leg lengthening and shortening


Leg lengthening and shortening are types of surgery to treat some people who have legs of unequal lengths.

These procedures may:

Alternative Names

Epiphysiodesis; Epiphyseal arrest; Correction of unequal bone length; Bone lengthening; Bone shortening; Femoral lengthening; Femoral shortening



Traditionally, this series of treatments involves several surgeries, a long recovery period, and a number of risks. However, it can add up to 6 inches (15 centimeters) of length to a leg.

The surgery is done under general anesthesia. This means the person is asleep and pain-free during surgery.

When the leg has reached the desired length and has healed, another surgery is done to remove the pins.

In recent years, several newer techniques have been developed for this procedure. These are based on the traditional leg lengthening surgery, but may be more comfortable or convenient for some people. Ask your surgeon about the different techniques that may be appropriate for you.


This is a complex surgery that can produce a very accurate degree of change.

While under general anesthesia:


Bone growth takes place at the growth plates (physes) at each end of long bones.

The surgeon makes a cut over the growth plate at the end of the bone in the longer leg.


Metal pins, screws, staples, or plates may be used to hold the bone in place during healing. Most orthopedic surgeons will wait several months to a year before removing any large metal implants. Another surgery is needed to remove the implanted devices.

Why the Procedure Is Performed

Leg lengthening is considered if a person has a large difference in leg length (more than 5 cm or 2 inches). The procedure is more likely to be recommended:

Leg shortening or restricting is considered for smaller differences in leg length (usually less than 5 cm or 2 inches). Shortening a longer leg may be recommended for children whose bones are no longer growing.

Bone growth restriction is recommended for children whose bones are still growing. It is used to restrict the growth of a longer bone, while the shorter bone continues to grow to match its length. Proper timing of this treatment is important for best results.

Certain health conditions can lead to very unequal leg lengths. They include:


Risks for anesthesia and surgery in general include:

Risks of this surgery include:

After the Procedure

After bone growth restriction:

After bone shortening:

After bone lengthening:

Because the blood vessels, muscles, and skin are involved, it is important to check the skin color, temperature, and sensation of the foot and toes frequently. This will help find any damage to blood vessels, muscles, or nerves as early as possible.

Outlook (Prognosis)

Bone growth restriction (epiphysiodesis) is most often successful when it is done at the correct time in the growth period. However, it may cause short stature.

Bone shortening may be more exact than bone restriction, but it requires a much longer recovery period.

Bone lengthening is completely successful about 4 out of 10 times. It has a much higher rate of complications. Joint contractures may occur.


Davidson RS. Leg-length discrepancy. In: Kliegman RM, Stanton BF, St. Geme JW, Schor NF, eds. Nelson Textbook of Pediatrics. 20th ed. Philadelphia, PA: Elsevier; 2016:chap 676.

Kelly DM. Congenital anomalies of the lower extremity. In: Azar FM, Beaty JH, Canale ST, eds. Campbell's Operative Orthopaedics. 13th ed. Philadelphia, PA: Elsevier; 2017:chap 29.

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