that is a very broad question!
is it with regard a specific person with osgood-schlatters?
do you have any details?
i attended an excellent knee course recently given by a renowned physio with a wealth of experience treating knee injuries. in his time in professional football he came up with guidelines regarding the treatment of the above issue. basically it involed measuring young footballers (13~16) to spot times of growth spurt ie measuring med malleolus to tib tub etc. when a growth spurt was seen the kid was pulled from training for 8 days. did serious upper limb stuff instead. in 3 years the centre had reduced the amount of days lost to this condition by well over 60 per cent. it makes sense when you think about bone formation physiology and then you think of the forces of strong quads pulling at the tib tuberosity in times of a spurt. so simple yet so effective.