Osgood-Schlatter Disease is characterized by activity-related pain and swelling under the patella (at the insertion of the patellar tendon to the tibial tubercle). It is more common in young boys (age 10-15) and occurs during a rapid growth spurt when the tibial tubercle is susceptible to stress. The cause is usually prolonged overuse. Physiotherapy management aims at reducing pain and swelling by application of therapeutic modalities including ice, stretching exercises to tight muscles, especially quadriceps group and education to avoid sports and excessive exercise involving deep squats and jumping.