Osgood-Schlatter disease is an avulsive injury of the patellar tendon at its distal attachment to the tibial tuberosity which results in a painful tibial tuberosity. The condition is most prevalent in pre-adolescent boys (5:1 boys > girls).

The radiologic findings of Osgood -Schlatter disease include:

• soft tissue swelling about the patellar tendon
• thickened patellar tendon
• loss of infrapatellar fat pad
• irregularity of the tibial tuberosity

Osgood-Schlatter disease in a 13-year-old girl. A lateral view of the left knee shows fragmentation of the tibial tubercle with displacement of the tibial tubercle fragments. Also note the soft tissue swelling inferior to the patellar ligament.