Osgood-Schlatter disease occurs most often in children. Especially those who are active in sports. This disease is more likely to occur in boys than girls. A painful lump behind the patella is detected and occurs during a growth spurt while the person is in active puberty. The knee pain will become more painful with more activity. Xray and MR will help in the diagnosis of this disease.
information found at http://www.mayoclinic.com/health/osgood-schlatter-disease
Daisy
