Who Does Sever’s Disease Affect?

Sever’s disease (also known as ‘Severs’ or calcaneal apophysitis) is a common cause of heel pain, particularly in people who are young and physically active. It usually develops around puberty. Boys are slightly more likely to have this condition than girls. 

The cause of Sever’s disease is unknown. It is likely to be caused by multiple factors such as overuse and increased body weight.

Sever’s disease is a self-limiting condition. This means that symptoms often ease with time. Medical and allied health professionals can help manage the symptoms of Sever’s disease so that the young person can continue to take part in physical activity.

Cause of Sever’s disease

The Achilles tendon joins the calf muscle at the back of the leg to the heel bone. Sever’s disease is thought to occur because the growth area where the Achilles tendon attaches to the bone (the apophysis) is ‘active’. This means it is beginning to change from cartilage to bone.

During this phase, pre-teens can get pain at the attachment area, or in the tendon or the heel bone itself. This is known as apophysitis. Sever’s disease most commonly affects children between the ages of eight and 14 years, when growth spurts are beginning.

Symptoms of Sever’s disease

A few signs and symptoms point to Sever’s disease, which may affect one or both heels. These include:

• heel pain during physical exercise, especially activities that require running or jumping
• worsening of pain after exercise
• limping – often in the morning, or during or after sport
• a tendency to tiptoe.

Factors that contribute to Sever’s disease

Sever’s disease is age- and activity-related. It usually starts in pre-teens, and may be more common in pre-teens who are physically active. It occurs when the calcaneal (heel) apophysis is open and active.

Factors that may contribute to Sever’s disease in pre-teens include changes in:

• height and weight
• how much physical activity they are doing – this may be an increase in volume, intensity or frequency of activity. This commonly occurs:
  -as one sports season ends and another starts
  -where there is crossover in sport
  -when a child starts to train and play for a team (the volume of activity increases with multiple weekly training sessions and a game)
  -when they are involved in a sports carnival which involves playing multiple games in one day or over a number of days
• frequency of physical activity
• the type of physical activity – such as starting a different activity, or returning to a physical activity after a break. Sever’s disease is most commonly associated with sports and activities that are weight bearing, such as sports that involve running or jumping or both (for example, football, netball, running and gymnastics)
• equipment or external factors – such as changing to shoes with a low heel (for example, football boots or some types of running shoes; the lower heel adds extra load to the apophysis, because it places the Achilles tendon on increased stretch), doing a sport in bare feet, or even walking at the beach in thongs/flip flops.
  Physical attributes that may contribute to developing Sever’s disease include:
• foot posture – active children who have a flat foot posture may be slightly more predisposed to Sever’s disease
  
• increased body weight, or
  
• a high BMI (body mass index).

Diagnosis of Sever’s disease

A doctor or allied health professional can diagnose Sever’s disease by asking the young person to describe their symptoms and by conducting a physical examination. In some rare instances, medical imaging may be required to rule out other causes of heel pain.

When an apophysis is active it is changing from cartilage to bone. During this phase, the normal x-ray appearance will vary from no bony tissue to small deposits of bone to a fully united bony tendon attachment.

However, there is usually no difference in what can be seen in a heel x-ray of a child experiencing Sever’s disease-related pain, and that of another child of the same age who is pain free. For this reason, x-rays are generally not used to diagnose Sever’s disease.

Source: betterhealth

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