Osgood-Schlatter's disease is a painful condition of the knee that occurs most commonly in athletes and adolescent boys ages 10-14. The condition occurs with stress to the patella tendon where it attaches to the tibia. The bony attachment called the tibial tuberosity can become swollen, tender and painful. Repetitive strain to the infra-patella tendon results in deterioration around the tibial tuberosity. Occasionally the forces can cause an avulsion fracture either partial or complete. The body heals these fractures by laying down more extra bone and a larger bump below the knee may occur.

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