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Osgood-Schlatter disease is a painful swelling of the bump on the upper part of the shinbone, just below the knee. This bump is called the anterior tibial tubercle. Osgood-Schlatter disease is thought to be caused by small injuries to the knee area from overuse before the knee is finished growing. The quadriceps muscle is a large, strong muscle on the front part of the upper leg. When this muscle squeezes contracts , it straightens the knee. The quadriceps muscle is an important muscle for running, jumping, and climbing. When the quadriceps muscle is used a lot in sports activities during a child's growth spurt, this area becomes irritated or swollen and causes pain.