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Knock knees

Knock knees is when there's a gap between your ankles when you stand with your knees together. It's common in children aged 3 to 6 and usually gets better on its own as they grow without causing any problems. Sometimes older children or adults can have it.

Check if it's knock knees

Most people will not have any other symptoms.

But sometimes, if your knock knees are severe or caused by another condition, you may have knee or leg pain, or difficulty walking.

See a GP if:

You think you or your child have knock knees and:

  • the gap between the ankles is more than 8cm when standing with the knees together
  • 1 or both knees are painful, swollen, stiff or feel warm to touch
  • only 1 leg is affected or the legs are different lengths
  • the problem is getting worse
  • your child is very short or underweight for their age
  • you or they are limping or having difficulty walking
  • your child is under the age of 2 or over the age of 5
  • it started when you were an adult
Treatment for knock knees

Knock knees usually gets better as children grow and their legs straighten.

Most children do not need any treatment, but sometimes physiotherapy or treatment from a foot specialist (podiatrist) may be recommended.

Sometimes, if knock knees cause problems such as pain or difficulty walking, you may be referred to a specialist for tests to see what might be causing it.

Rarely, surgery to straighten the knees and legs may be recommended.

Self-refer for treatment

If you have knock knees, you might be able to refer yourself directly to services for help with your condition without seeing a GP.

To find out if there are any services in your area:

  • ask the receptionist staff at your GP surgery
  • check your GP surgery's website
  • contact your local integrated care board (ICB) – find your local ICB
  • search online for NHS treatment for knock knees near you
Causes of knock knees

Knock knees in children is a normal part of growth and development, and it usually gets better as they get older.

But in some children and adults it may be caused by something else, such as:

Last Reviewed
21 February 2024
NHS websiteNHS website
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Hedgegrail Pharmacy in Stoke Poges offers a wide range of prescription and over-the-counter medications, as well as health and beauty products
Company Registration: 2041755
Premises GPhC: 1099892
Superintendent: Baljit Singh Bahra
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