BACK TOTOP Browse A-ZSearchBrowse A-ZABCDEFGHIJKLMNOPQRSTUVWXYZ0-9 E-mail FormEmail ResultsName:Email address:Recipients Name:Recipients address:Message: Print-FriendlyBookmarksbookmarks-menuKnock kneesGenu valgumKnock knees are condition in which the knees touch, but the ankles do not touch. The legs turn inward. Causes Infants start out with bowlegs because of their folded position while in their mother's womb. The legs begin to straighten once the child starts to walk (at about 12 to 18 months). By age 3, the child becomes knock-kneed. When the child stands, the knees touch but the ankles are apart.By puberty, the legs straighten out and most children can stand with the knees and ankles touching (without forcing the position).Knock knees can also develop as a result of a medical problem or disease, such as:Injury of the shinbone (only one leg will be knock-kneed) Osteomyelitis (bone infection) OsteomyelitisOsteomyelitis is a bone infection. It is mainly caused by bacteria or other germs.Read Article Now Book Mark Article Overweight or obesity Rickets (a disease caused by a lack of vitamin D) RicketsRickets is a disorder caused by a lack of vitamin D, calcium, or phosphate. It leads to softening and weakening of the bones.Read Article Now Book Mark Article Exams and Tests A health care provider will examine your child. Tests will be done if there are signs that knock knees are not a part of normal development. Treatment Knock knees are not treated in most cases.If the problem continues after age 7, the child may use a night brace. This brace is attached to a shoe. Surgery may be considered for knock knees that are severe and continue beyond late childhood. Outlook (Prognosis) Children normally outgrow knock knees without treatment, unless it is caused by a disease. If surgery is needed, the results are most often good. Possible Complications Complications may include:Difficulty walking (very rare) Self-esteem changes related to cosmetic appearance of knock knees If left untreated, knock knees can lead to early arthritis of the knee When to Contact a Medical Professional Call your provider if you think your child has knock knees. Prevention There is no known prevention for normal knock knees.Open ReferencesReferencesDeeney VF, Arnold J. Orthopedics. In: Zitelli, BJ, McIntire SC, Nowalk AJ, eds. Zitelli and Davis' Atlas of Pediatric Physical Diagnosis. 7th ed. Philadelphia, PA: Elsevier; 2018:chap 22.Pomeranz AJ, Sabnis S, Busey SL, Kliegman RM. Bowlegs and knock-knees. In: Pomeranz AJ, Sabnis S, Busey SL, Kliegman RM, eds. Pediatric Decision-Making Strategies. 2nd ed. Philadelphia, PA: Elsevier Saunders; 2016:chap 49.Winell JJ, Baldwin KD, Wells L. Torsional and angular deformities of the limb. In: Kliegman RM, St. Geme JW, Blum NJ, Shah SS, Tasker RC, Wilson KM, eds. Nelson Textbook of Pediatrics. 21st ed. Philadelphia, PA: Elsevier; 2020:chap 695.AllVideoImagesTogRelated Information Review Date: 10/2/2020 Reviewed By: Neil K. Kaneshiro, MD, MHA, Clinical Professor of Pediatrics, University of Washington School of Medicine, Seattle, WA. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team. The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- © 1997- All rights reserved. A.D.A.M. content is best viewed in IE9 or above, Firefox and Google Chrome browser.Content is best viewed in IE9 or above, Firefox and Google Chrome browser.