My son's new friend has one leg that is shorter than another. She's 14. What could be the cause of that?

There are several reasons why someone may have a leg length difference. Some people are born with dislocated hips congenital dislocated hip and this can affect leg length. Some people develop infections in their hip, which can cause shortening. Tumors in the leg may need to be removed, shortening the bone somewhat. A break earlier in life may not have healed properly; the bones may be malaligned, with one end slightly overlapping the other. Scoliosis that is severe (curvature of the spine) could result in a leg length difference, as can other disorders of the spine or muscles.

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