Leg Length Discrepancy

About a third of the population has a 1cm (½ inch) or less discrepancy between their right and left legs. 

If you have a slight discrepancy in the length of your legs, you are not alone. While it may seem like a rare condition or even something that could interfere with your quality of life, that is simply not the case. Leg length discrepancies are extremely common, caused by a number of factors, and often are not noticeable and require no treatment. 

Leg length discrepancies that impact your mobility will require treatment. In milder cases, an orthotic will do the trick however in more severe cases extensive shoe modifications or even surgery could be needed. 

In short, a limb-length discrepancy occurs when there is a difference in the length of your right and left leg.

Nearly 1 in 3 people have a slight discrepancy in the length of their legs and often experience no symptoms.  

There are instances where leg length discrepancies are more pronounced, and this can have an impact, especially in children. Some children may have a noticeable limp or trouble participating in activities such as running or jumping. 

When children are born with a limb-length discrepancy, it does not usually manifest itself until the child is crawling or walking. 

The causes are numerous, common causes are:

The effects of a leg-length discrepancy can vary, often depending on the severity of the discrepancy. Common signs/symptoms include:

Treatment for limb-length discrepancy ultimately depends on how severe the discrepancy is among other factors such as:

For patients with a minor discrepancy in their limbs, and no angular deformity, non-surgical treatment is available as an option. This is because the risks of surgery outweigh the benefits.

Observation

For children who have not yet reached maturity, simply watching and waiting until growth is complete is an option. It’s possible that the discrepancy will continue to be minor or resolve itself as the child grows. For minor cases, doctors may recommend this as an option out of caution.

Orthotics

Your doctor may recommend an orthotic to see if it helps improve your child’s ability to walk/run. Insole may provide additional benefits here such as extra support, reducing back/joint pain caused by the discrepancy, as well as preventing a host of other conditions. A heel lift may be placed beneath the orthotic to help equal out the length discrepancy.

Shoe Modifications

For a discrepancy that is a bit more severe, a doctor may prescribe a build up to the outside sole of a shoe to help even out the discrepancy.  Measurements should be taken by a doctor and shoe modifications should be made to approved shoes by a certified Pedorthist.

Surgical treatment for limb-length discrepancies are designed to:

For minor cases (less than ½” in difference) orthotics may be recommended to provide stability, help with balance, and prevent other conditions. Custom orthotics help by raising the lower leg to eliminate the discrepancy, this can make it easier for your child to walk, run, or do any other activity they would like. In some cases it is optimal to use an over-the-counter insole in combination with a heel lift.  Insoles and orthotics also add support and stability which can keep your child comfortable as they grow.