This disease is probably caused by microtrauma (small, usually unnoticed injuries caused by repetitive overuse) which occurs before the complete maturity of the anterior tibial tubercle attachment.
The disorder is typified by a painful swelling just below the knee on the front (anterior) surface of the lower leg bone. The area is tender to pressure, and swelling ranges from minimal to very severe. Running, jumping, and climbing stairs cause discomfort. Symptoms occur on one or both legs. The disorder is seen most often in active, athletic adolescents, with boys more frequently affected than girls.
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