It is thought to be a traction injury, where the Achilles tendon and Plantar fascia pull in opposite directions. Sever?s occurs in children aged 8 to 16 years old. In children, the heel bone is made up of 2 bones, with a growth plate of cartilage in between the sections, holding these 2 bones together. As the cartilage expands, the edges of it eventually turn to bone, and finally the gap closes. This usually occurs within the first 13-15 years of life. However, because these bones are connected by cartilage they are weaker than normal bones. This is why they are very vulnerable to injury.
This condition is more common in boys than girls. It generally presents between the ages of 9-14 and peaks between ages 10-12 years. This injury can reoccur up until the age of 17, when the growth plate of the calcaneous generally closes. These types of injuries will commonly occur during periods of rapid growth. Sever?s Disease occurs more frequently in child with flat feet, but all children with flat feet will not get Sever?s.
Symptoms of calcaneal apophysitis may include pain in the back or bottom of the heel, Limping, walking on toes, difficulty running, jumping, or participating in usual activities or sports. Pain when the sides of the heel are squeezed.
Sever?s disease can be diagnosed based on your history and symptoms. Clinically, your physiotherapist will perform a "squeeze test" and some other tests to confirm the diagnosis. Some children suffer Sever?s disease even though they do less exercise than other. This indicates that it is not just training volume that is at play. Foot and leg biomechanics are a predisposing factor. The main factors thought to predispose a child to Sever?s disease include decrease ankle dorsiflexion, abnormal hind foot motion eg overpronation or supination, tight calf muscles, excessive weight-bearing activities eg running.
Non Surgical Treatment
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.