Sever’s Disease is not a disease in the sense of an infection or other chronic pathology but is an injury/irritation of a growth plate. The Calcaneal growth plate or growth plate in the heel bone has attachments from the achilles tendon and the plantar fascia. Pull from either or both of these structures can cause enough motion within the apophysis or growth plate space to create irritation and inflammation which can be quite painful and limiting. This can start when the growth plate is still wide open but is more often seen as the growth plate starts to close further limiting its ability to move with the traction of soft tissue attachments. It was believed by Sever that fractures within the growth plate were the source of the discomfort. When looking at a growth plate that has started to close it can appear to be fragmented into 2 or 3 pieces. It has since been proven that this is the normal appearance of a closing growth plate.
Sever?s disease is often associated with a growth spurt, when the bones grow but the muscles do not. Therefore the muscles effectively become tighter which results in increased stress at the heel. It may also be related to unusual biomechanics, for instance poor foot posture, muscle tightness or muscle weakness. Overtraining or incorrect training can also play a part. Usually, the cause is a combination of factors.
This syndrome can occur unilaterally or bilaterally. The incidence of bilaterally is approximately 60%. Common signs and symptoms include posterior inferior heel pain (over the medial and lateral surface of the bone). Pain is usually absent when the child gets up in the morning. Increased pain with weight bearing, running or jumping (= activity-related pain). The area often feels stiff. The child may limp at the end of physical activity. Tenderness at the insertion of the tendons (= an avascular necrosis of the arthropathy). Limited ankle dorsiflexion range secondary to tightness of the Achilles tendon. Hard surfaces and poor-quality or worn-out athletic shoes contribute to increased symptoms. The pain gradually resolves with rest. Reliability or validity of methods used to obtain the ankle joint dorsiflexion or biomechanical malalignment data are not commented upon, thus reducing the quality of the data. Although pain and limping are mentioned as symptomatic traits, there have been no attempts to quantify the pain or its effect on the individual.
The x-ray appearance usually shows the apophysis to be divided into multiple parts. Sometimes a series of small fragments is noted. Asymptomatic heels may also show x-ray findings of resporption, fragmentation and increased density. But they occur much less often in the normal foot. Pulling or ?traction? of the Achilles tendon on the unossified growth plate is a likely contributing factor to Sever?s disease. Excessive pronation and a tight Achilles and limited dorsiflexion may also contribute to the development of this condition.
Non Surgical Treatment
Treatment aim is to lessen the load on the insertion of the Achilles tendon, along with pain relief if necessary. This can be achieved by modifying/reducing activity levels. Shoe inserts or heel raises. Calf stretches. Avoiding barefoot walking. Strapping or taping the foot to reduce movement. Orthotic therapy if due to biomechanical causes. Other treatment includes icing of the painful area to reduce swelling, pain medication if necessary and immobilisation of the affected limb in severe or long standing cases.
Recovery time will vary from patient to patient. Age, health, previous injuries, and severity of symptoms will affect recovery time. Your compliance with the stretching program and the other recommendations made by your doctor will also determine your healing time. Heel pain often completely resolves after a child?s heel bone has stopped its period of growth.