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Knock knees

Contents of this page:

Alternative Names   

Genu valgum

Definition    Return to top

Knock knees is a condition in which the lower legs are positioned at an outward angle. When the knees are touching, the ankles are separated.

Causes    Return to top

Most children develop a slight knock-kneed stance by the time they are 2 or 3 years old, often with significant separation at the ankles when the knees are touching. This is part of normal development and often persists through age 5 or 6, at which time the legs begin to straighten fully. By puberty, most children can stand with the knees and ankles touching (without forcing the position).

Knock knees can also develop as a result of a disease, most often one that has already been diagnosed.

Exams and Tests    Return to top

If a doctor's examination and review of the child's medical history indicate a specific cause for the knock knees other than normal development, your health care provider will order the appropriate studies.

Treatment    Return to top

Knock knees are usually not treated. Surgery may be considered for knock knees that persist beyond late childhood and in which the separation between the ankles is severe.

Outlook (Prognosis)    Return to top

Children normally outgrow knock knees without treatment, unless there is an underlying disease. For cases requiring surgery, the procedure provides excellent cosmetic results.

Possible Complications    Return to top

When to Contact a Medical Professional    Return to top

Call your health care provider to schedule an evaluation if you suspect your child has knock knees.

Prevention    Return to top

There is no known prevention for normal knock knees.

References    Return to top

Sass P, Hassan G. Lower extremity abnormalities in children. Am Fam Physician. 2003 Aug 1;68(3):461-8. Review.

Update Date: 3/14/2009

Updated by: Neil K. Kaneshiro, MD, MHA, Clinical Assistant Professor of Pediatrics, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

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