Osgood Schlatter Syndrome is an acute inflammation just below the knee joint at the site where the tendon of the quadriceps (anterior thigh) muscles inserts into the shin bone (tibial tubercle). The tibial tubercle develops separately from the rest of the shin bone (tibia), but the two begin to fuse during adolescence. Osgood Schlatter is caused by tension placed on this site by repeated thigh muscle contraction before bone fusion is complete. The condition occurs in children 9 to 14 years of age who have undergone a rapid growth spurt, and is more common in adolescents who are active in sports.
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