Osgood-Schlatter disease is a painful condition that affects the knee of children. It is a common cause of knee pain in children and young athletes.
It is a painful lump that forms below the kneecap in children who are still growing. It occurs in children between the ages of 10 and 15 who participate in sports that involves jumping and running.
It occurs due to a period of rapid growth, combined with a high level of sporting activity. The large thigh muscles (quadriceps) is attached to the top of the shin bone (tibia) via the kneecap (patella). In growing children, the bone is soft and the pull of the quadriceps can cause inflammation, pain and swelling.