Osgood-Schlatter disease

Osgood-Schlatter disease  is one of the most frequent causes of knee pain in adolescents. The condition is probably related to repetitive trauma (as from chronic jumping or similar strenuous exercise) on a developing tibial tuberosity. This can lead to avulsion or fragmentation of the tibial tuberosity, heterotopic bone formation, thickening of the distal patellar tendon, and considerable soft-tissue swelling. Osgood-Schlatter disease presents with considerable focal pain and a palpable subcutaneous lump in the region of the tibial tuberosity. The condition is often seen in association with a rapid growth spurt.