Overview
The large heel bone (called the calcaneus) has a growth plate at the back of the heel. This growth plate is made of soft cartilage and it gradually narrows and starts to turn into solid bone around 8 to 13 years of age. This growth plate is prone to becoming inflamed and painful at this time. The strong Achilles tendon happens to join onto the back of the heel bone and pulls on this growth plate when running causing Sever?s disease.
Causes
The exact cause of Severs disease is not completely understood. It is thought to be associated with an overuse type injury, in which repetitive stress from the Achilles tendon causes a portion of the growth plate to pull away from the heel. In medical terms, this is described as cyclic, micro-avulsion type fractures to the calcaneal apophyses.
Symptoms
On examination, the typical signs are tenderness on palpation of the heel, particularly on deep palpation at the Achilles tendon insertion. Pain on dorsiflexion of the ankle, particularly when doing active toe raises; forced dorsiflexion of the ankle is also uncomfortable. Swelling of the heel, usually mild. Calcaneal enlargement, in long-standing cases.
Diagnosis
This can include physical examination and x-ray evaluation. X-rays may show some increased density or sclerosis of the apophysis (island of bone on the back of the heel). This problem may be on one side or bilateral.
Non Surgical Treatment
If the child has a pronated foot, a flat or high arch, or another condition that increases the risk of Sever’s disease, the doctor might recommend special shoe inserts, called orthotic devices, such as heel pads that cushion the heel as it strikes the ground, heel lifts that reduce strain on the Achilles tendon by raising the heel, arch supports that hold the heel in an ideal position. If a child is overweight or obese, the doctor will probably also recommend weight loss to decrease pressure on the heel. The risk of recurrence goes away on its own when foot growth is complete and the growth plate has fused to the rest of the heel bone, usually around age 15.
Exercise
Stretching exercises can help. It is important that your child performs exercises to stretch the hamstring and calf muscles, and the tendons on the back of the leg. The child should do these stretches 2 or 3 times a day. Each stretch should be held for about 20 seconds. Both legs should be stretched, even if the pain is only in 1 heel. Your child also needs to do exercises to strengthen the muscles on the front of the shin. To do this, your child should sit on the floor, keeping his or her hurt leg straight. One end of a bungee cord or piece of rubber tubing is hooked around a table leg. The other end is hitched around the child’s toes. The child then scoots back just far enough to stretch the cord. Next, the child slowly bends the foot toward his or her body. When the child cannot bend the foot any closer, he or she slowly points the foot in the opposite direction (toward the table). This exercise (15 repetitions of “foot curling”) should be done about 3 times. The child should do this exercise routine a few times daily.
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