What Causes Bow Legs? 6 Bow Legged Causes

Bow legs are caused due to several factors. However, in this post, we have listed 6 common causes for bow legs.

6 Bow Legged Causes

Here we have listed 6 bow legged causes. They aren’t comprehensive. But in most cases, the causes are attributed to any of these 6 reasons.


Rickets is caused by Vitamin D deficiency. This is common i children between 6 and 36 months old.

When a body is deficient in Vitamin D the bones become weak. They turn soft and brittle. Therefore, unable to withstand the body’s weight, the legs tend to bend outwards.

Vitamin D is found in meats, fish, eggs and dairy products. It is also known as sunshine vitamin because it is created when you are under the sun.

However, in the US, Rickets has been abolished. In some developing countries, this can still be seen.

In the early 1900’s this was the dominant cause of Bow Legs.


This is a disease known by its common name dwarfism.

The person with this disease has a short stature and have usually bow legs.

This is caused when your bones don’t develop. During early stages of a fetus the bones are made of cartilage. As time passes the body converts cartilages to bones. However, in the case of Achondroplasia the bones are still made of cartilages.

In such cases, the person never grows more than 5 feet. Generally their height is around 4 feet only.

In 20% of the cases this disease has been found to be genetic.


Fracture is breaking of your bone. It can range from a minute crack to breaking your bones into two.

When fracture occurs in your leg or knee this can result in bow legs.

Two things can happen during a fracture

If the fracture is on your leg it can make your leg weak. Sometimes, when the fractured bones are fixed improperly during treatment this too can result in bow legs.

The second reason is fracturing of the knee. Your knee is important to have a straight leg. When your knee rotates inwards this pushes your legs outside resulting in bow legs.

Bone Tumours

Like the usual tumours your bone can have tumours too.

When bone tumours occur in your leg this weakens your leg. Finally. this results in bow legs.

However, this is a rare occurence.

Brittle Bone Disease

As the name implies your bones are brittle in this condition. The bones are so weak that one can easily fracture oneself.

This is usually found in new borns especially with a family history of this disease.

Since all your bones are weak in this condition, your legs unable to withstand your weight bends outwards resulting in bow legs.

Improper Walking Form

This is the most common cause of Bow Legs (if you don’t have any of the above conditions).

An improper walking form results in bow legs over a long period of time. This is especially found in persons above the age of 15.

Due to their irregular walking habits legs turn to bend outwards.

The good news, however, is that it can be easily fixed with the help of these exercises.

The above were some of the main causes of bow legs. but…

If you are interested to fix your bow legs permanently we suggest you read this article.