Conditions + Treatments

Knock Knees in Children

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Contact the Lower Extremity Program

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  • International: +01-617-355-5209
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What are knock knees?

Knock knees are angular deformities at the knee, in which the head of the deformity points inward.  A standing child whose knees touch but whose ankles do not is usually said to have knock knees. During childhood, knock knees are a stage in normal growth and development (physiologic valgus).

Between birth and 18 months, an outward-turning (varus) alignment from hip to knee to ankle is normal. Between about 18 and 24 months, this alignment normally becomes neutral. When the child is between 2 and 5 years old, an inward-turning (valgus) alignment is normal. The alignment returns to neutral as the child grows.

“Normal

How we care for knock knees

Doctors at Boston Children's closely monitor your child’s leg development, to make sure that her legs straighten themselves naturally. In the unlikely event that the condition doesn’t self-correct, your child’s doctors may suggest corrective leg braces. Only children with the most severe cases may need surgery.

As a national and international orthopedics referral center, our Orthopedic Center has vast experience managing all aspects of knock knees including the diagnosis, treatment and care for every severity level.

Boston Children’s is so much more than a hospital—it’s a community of researchers, clinicians, administrators, support staff, innovators, teachers, patients and families, all working together to make the impossible possible. ”
- Sandra L. Fenwick, President and CEO

Boston Children's Hospital
300 Longwood Avenue, Boston, MA 02115
For Patients: 617-355-6000
For Referring Providers: 844-BCH-PEDS | 844-224-7337

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