Biomechanical Aetiology
Between the ages of 8-13 years children's bones are still in the growth stage and the growth plates have not become ossified. The combination of growth, bad biomechanical structure and activity, such as sport, combine together to cause inflammation and pain at the point where the tendo Achilles (heel cord) inserts on to the calcaneus or heel bone. Excessive pronation is a major contributing factor together with the child's growth spurt pattern.
Severs is similar to Osgood Schlatters disease of the knee, which usually occurs in slightly older children, both conditions respond exceptionally well to orthotic therapy. Often the calcaneus (heel bone) can be dislocated and this may contribute to lowering the arch height and allowing the heel to increase its pronatory path stretching the Achilles and causing further pain and discomfort.
In very severe cases the growth plate can be detached from the calcaneus and fractures or microfractures can completely detach the plate and the growth plate can be pulled out of position up the heel as the Achilles tries to reposition the attachment to provide less tension. If detachment occurs during this period bone death or necrosis can occur which can be quite dangerous to the child and affect their long term health and leisure activities.
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