Osgood-Schlatter disease

Osgood–Schlatter disease or syndrome (also known as tibial tubercle apophyseal traction injury) is an irritation of the patellar tendon at the tibial tuberosity. Sinding–Larsen–Johansson syndrome is an analogous condition involving the patellar tendon and the lower margin of the patella bone, instead of the upper margin of the tibia. The condition occurs in active boys and girls aged 9–16 coinciding with periods of growth spurts. It occurs more frequently in boys than in girls, with reports of a male-to-female ratio ranging from 3:1 to as high as 7:1. It has been suggested the difference is related to a greater participation by boys in sports and risk activities than by girls. The condition is usually self-limiting and is caused by...