Osgood slatter is in principle a inflamation and should be treated like that. The reason why you will not find any literature is because 1 it is self limiting, 2 a chronic inflamation which becomes worse in case the patient is doing to much. 3 nto seen as any different chronic inflamation where q-ceps are involved.
So feel free to make up your own treatment.
Advice; restrict force on insertion in tibia.
good luck.