The orthosis was constructed using materials designed to meet the following needs.

• Module 1: Reduce heel bone pain

• 2nd module: pressure on the heel, cushion to limit impact

• 3rd module: distribute the plantar pressure

• 4th module: to ensure fitness and durability for sports activities

Sever's disease is a form of osteochondrosis that occurs in the heels of some children.It is more common in physically active children and causes heel pain. This pain increases when you exercise or walk.Pain can be quite sharp, affected children are proned to walk on their fingertips.

Sever's disease is one of the most common growth pathologies in physically active children and affects both boys and girls. Occurs around the age of 8 and can be seen until the age of 15. Sports that involve repetitive movements, running and jumping, and the use of lower extremities (football, basketball, athletics, dance) and upper extremities (gymnastics, throwing sports) can trigger the situation. Inadequate warming or the use of inappropriate equipment will also encourage the onset of the disease.

IN THE STUDY OF FRANÇAISE POUR LA SANTÉ DU PIED (UFSP) PODIATRISTS WITH 200 PHYSICAL ACTIVE CHILDREN

The first step was identified children at risk.

- the presence of heel pain;

- presence of short calcaneal tendon (palpation);

- degree of valgus (static examination on the podoscope);

- Weekly training time (soft or hard) + number of hours.

After calculating the risk factor, the feet of children at risk of Sever's disease or who were already painful were observed on a podoscope. It was then supported with a specially developed insoles for Sever's disease.

In a few football clubs, about 200 children were carefully examined and 30% of them were diagnosed with a risk of Sever disease, children had a short calcaneal tendon, valgus foot, or pain.These children were provided with insoles as a preventative in most cases and as a treatment for those with foot pain.Young footballers wore insoles throughout the season and were watched by football coaches and podiatrists. After one season (September-June), the following observations were made:

• In the group of children supported with insoles as a preventive measure, only 5% of the severity of Sever's pain developed.

• In the group of children suffering from pain, 80% had reduced pain after wearing plantar orthoses and these children could continue to play football.

• The results confirm that the insoles developed for this pathology and the foot type of the patient are compatible.