What Causes Bow Legs in Children? Is Surgery Necessary?

• Bow legs in children or pediatric bow legs (Bow legs) are commonly seen in infants and toddlers learning to walk and usually improve on their own as the child grows. They can be caused by conditions such as rickets, Blount's disease, injuries, or genetic abnormalities.
• Treatment depends on the cause and severity. Parents should observe, consult a doctor, and follow up continuously to ensure effective treatment and prevent long-term complications.

Parents who notice their child has bow legs and are concerned whether it is abnormal should know that bow legs in young children are common and mostly resolve naturally with age. However, in some cases, it may indicate underlying health issues that require specialist diagnosis and appropriate care.

What is bow legs (Bow legs) and how can you tell if an infant has bow legs?

Bow legs (Bow legs) is a condition where the child's legs and knees curve slightly. It can affect one or both legs and may be accompanied by inward-turned feet. When standing straight with heels together, the knees remain apart. This is frequently observed in infants and toddlers and is usually a normal condition that corrects naturally.

What causes bow legs in children?

1. Normal bow legs in children

• may result from the legs being slightly curved and adapting to the confined space in the womb during pregnancy.
• In some rapidly developing young children, such as those who stand or walk earlier than usual or have higher weight, temporary bow legs may occur before gradually straightening.
• Some children may show "duck feet" or "pigeon toes" around ages 3-4 before returning to normal alignment by ages 7-8.

2. Abnormal bow legs in children can have several causes, including

• rickets, caused by severe vitamin D and calcium deficiency, making bones soft and prone to deformity.
• Blount's disease, a growth disorder of the inner knee bone causing progressively severe bow legs, especially in older children or adolescents.
• Infections or bone injuries may affect bone growth and result in bow legs.
• Certain genetic diseases such as brittle bone disease or metabolic disorders, or other conditions affecting bone growth may also cause bow legs.

When should you see a doctor about bow legs? How to recognize problematic bow legs in your child?

If your child shows any of the following signs, you should take them to a doctor for evaluation:

• One-sided or uneven bow legs
• Severe bow legs or worsening curvature
• Pain in the legs, knee pain, or abnormal walking
• Smaller than average size or developmental delays, which may indicate rickets or other disorders
• A family history of diseases causing bow legs, such as Blount's disease

What treatments are available for bow legs in children? Can parents correct bow legs themselves?

Most cases of bow legs in children improve naturally as they grow. The legs gradually straighten, typically improving by ages 2-3, sometimes with slight bowing again at ages 3-4, then returning to normal by around 7-8 years. Parents usually do not need to intervene.

Treatment approaches depend on the underlying cause.

• For bow legs caused by rickets,

treatment : Doctors recommend vitamin D and calcium supplements as advised. Early treatment generally yields good results.

• For bow legs caused by Blount's disease,

treatment : In early stages or mild cases,Blount's diseasemay be managed with leg braces to help correct alignment.

Surgical treatment for severe bow legs

In cases of severe bow legs that do not respond to other treatments or progressively worsen, surgery may be recommended. Surgical options include:

1. Guided Growth(Hemiepiphysiodesis), a minor surgery where small pins or plates are placed on the growth plate inside the knee to slow growth on that side. This allows the faster-growing outer side to straighten the leg naturally. This is usually done in children still growing (often school-aged children).

2. Osteotomy, a more complex surgery where a portion of the leg bone is cut and realigned to a straight position, then fixed with metal plates or screws. This is typically for very severe cases, unresponsive to other treatments, or older children.

Whether monitoring normal bow legs or treating abnormal cases, it is important to follow the doctor's advice closely, especially when using braces or after surgery, so the doctor can assess progress, adjust treatment plans, and prevent complications.

Although bow legs in children usually resolve naturally as they grow, parents should regularly observe changes in leg shape, walking, and other symptoms. If there is any doubt,or ifabnormalities are noticed, consulting a doctor is essential for proper diagnosis and care to ensure your child grows strong and develops well.

Information provided by Assoc. Prof. Dr. Chatuporn Chotikavanich, Orthopedic Surgery, License No. W.19653Samitivej International Children's Hospital