Thanks for writing in.
Osgood Shlatter's disease is an epiphysitis of the tibilial tuberosity. This happens due to irritation of patellar ligament
at its attachment with the tibial tuberosity.
It is a benign non serious condition. Only the discomfort appears from time to time.
This condition can be tackled with rest, ice packing, compression and limb elevation.
Hope this helps.