Osgood-Schlatter is a common condition in young athletes that refers to irritation of a growth plate at the knee. It typically occurs in active teens during their growth spurt and resolves after the bone stops growing.

Children have growth plates calledapophyses where muscles and tendons attach. The patellar tendon of the knee connects the knee cap quadriceps (thigh) muscles to the shin bone at the tibial tubercle (bump below the knee). This growth plate is attached to the shin bone by cartilage and is subject to stress from overuse when the quadriceps muscles repetitively pull while running or jumping.

The main symptom of Osgood-Schlatter is pain at the bump below the knee with activity or after a fall. There may also be swelling around or enlargement of the bump. This bump is usually very tender to the touch. Forceful contraction of the thigh muscles can also cause pain. This...

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