Overview
Sever disease, first described in 1912, is a painful inflammation of the calcaneal apophysis. It is classified with the child and adolescent nonarticular osteochondroses. (The other disease in this group is Iselin disease, which is inflammation of the base of the fifth metatarsal.) The etiology of pain in Sever disease is believed to be repetitive trauma to the weaker structure of the apophysis, induced by the pull of the tendo calcaneus (Achilles tendon) on its insertion. This results in a clinical picture of heel pain in a growing active child, which worsens with activity. Sever disease is a self-limited condition, accordingly, no known complication exists from failure to make the correct diagnosis.
Causes
At birth, most of our foot bones are still made of cartilage, which ossifies (becomes bony) over the first few years of life. At the back of the heel, there is a growth plate that is attached to the main body of the heel bone by a cartilaginous join. At about the age of 14-15 years, this area of cartilage between the growth plate and the heel bone ossifies, fusing the area to the heel. Sever?s disease occurs when there is too much motion or strain across the growth plate, resulting in this area becoming inflamed and painful.
Symptoms
The most prominent symptom of Sever’s disease is heel pain which is usually aggravated by physical activity such as walking, running or jumping. The pain is localised to the posterior and plantar side of the heel over the calcaneal apophysis. Sometimes, the pain may be so severe that it may cause limping and interfere with physical performance in sports. External appearance of the heel is almost always normal, and signs of local disease such as edema, erythema (redness) are absent. The main diagnostic tool is pain on medial- lateral compression of the calcaneus in the area of growth plate, so called squeeze test. Foot radiographs are usually normal. Therefore the diagnosis of Sever’s disease is primarily clinical.
Diagnosis
Low-grade inflammation of the calcaneal apophysis cannot be seen on x-ray. Therefore, although x-rays are often done to rule out bony injuries in children with Sever’s disease these x-rays are usually normal. Advanced Sever’s disease can be seen on x-ray but usually the problem is treated before it reaches this point. Other diagnostic tests, such as bone scans or MRI’s, are not usually required in typical cases of Sever’s disease. These, or other tests, may be required to rule out other conditions, such as stress fractures of the calcaneus or other bony abnormalities that can mimic Severs disease.
Non Surgical Treatment
Management by a health professional of Sever’s disease is often wise. There are a few very rare problems that may be causing the pain, so a correct diagnosis is extremely important. Advice should be given on all of what is mentioned above, appropriate activity levels, the use of ice, always wearing shoes, heel raises and stretching, follow this advice. As a pronated foot is common in children with this problem, a discussion regarding the use of foot orthotics long term may be important. Strapping or tape is sometimes used during activity to limit the ankle joint range of motion. If the symptoms are bad enough and not responding to these measures, medication to help with anti-inflammatory may be needed. In some cases the lower limb may need to be put in a cast for 2-6 weeks to give it a good chance to heal. After the calcaneal apophysitis resolves, prevention with the use of stretching, good supportive shock absorbing shoe and heel raises are important to prevent it happening again.
Recovery
The condition is normally self-limiting, and a return to normal activities is usually possible after a period of 2-3 months. In one study, all the patients treated with a physiotherapy programme (above) improved and could return to their sport of choice after two months of treatment. The condition may recur, although recurrence was uncommon, according to one study.
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