What is a stress fracture?

A stress fracture occurs when a bone breaks but not all the way through. It will feel like a deep throbbing pain and you may notice some swelling and more pain when load bearing. Most common stress fractures occur at the Tibia – one of two bones that make up the calf. The Tibia is the larger bone at the front of the leg. As it is weight bearing it takes the most pressure from activities such as running.


What is a stress fracture

What causes stress fractures?

Where typical bone breaks are the result of a traumatic impact, hairline or stress fractures are the result of repeated application of force on the bone over time. This is why athletes have a higher risk of stress fractures if they do not take the right precautions.

There are a number of steps you can take to treat – or better yet – prevent suffering a stress fracture.



First of all, you should rest. Stress fractures can take several weeks, often up to 8 weeks, depending on the severity. Significantly decreasing the intensity and/or frequency of your exercising is going to help with healing.


You may require some sort of cast or brace to help keep the bone supported and in place while it heals. Physical therapy may needed to help your injured bone regain strength and prevent further injury in the future. In extreme cases, surgery is necessary – but this is very rare.

Cause of stress fractures
 How Enertor insoles can treat a stress fracture

Stress fracture cure

The best cure is actually preventing the condition from developing in the first place, and there are a number of ways to do that. One way is to make sensible increases to your training schedule instead of making huge changes all at once. Ease yourself into your new routine, perhaps by simply adding an extra few minutes to your runs each day instead of going from a 5K to 10K overnight, for example.


Another prevention method is to ensure that your running shoes are both suitable for you and in good condition. Running with shoes that are beat up and seen better days will only serve to increase your risk of injury. Regularly update your kit to stay stress fracture-free.

How Enertor insoles help

The final tip we’ll offer is to use our very own insoles. Enertor insoles have been rigorously tested and are proven to protect against stress fractures thanks to their state-of-the-art D3O technology. We have the support of Usain Bolt and the British Armed Forces, and you can see our insoles in action in this short video.


  1. 44% shock absorption – all Enertor insoles offer more shock absorption than any other insole. This reduces force and minimises pressure on the lower limbs.
  2. Improved mid-foot control – Enertor Performance insoles' met dome and control chassis improves foot function and naturally lowers high force movements. This then puts less stress on the lower limbs.

Check out our product range to find the perfect insoles for you.

Cause of stress fractures

Shoe inserts for stress fractures

Enertor Three Quarter Length Comfort insole

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Enertor Comfort Heel Cup

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