Osgood Slatter's disesase (my brother had it) is usually an "overuse" injury/complaint in early teens. Dont think there is much you can do about it, apart from sustained rest, but that then goes against what he is after!
With regards to the other positions, has his posture, and muscles been checked for full ROM and current position? At that age, his body is starting to grow rapidly, and could push him out of line/synch....tread carefully!

I had many friends with this complaint when we were younger. The only cure appears to be full rest. One friend had an ankle to hip complete leg cast for 8 weeks to sort it out. Don't expect a fast resolution.

Agreed that it really requires rest. You will find that many of these issues start as a simple traction apophysitis and as such the original cause is often biomechanical or neurological in nature.

He needs to get right away from all simple sugars. He is probably someone who has a high stimulant intake (caffiene or sweets) and dramatically increase his dark leafy green intake to increase B12 and folate levels. He will also need to be checked for magnesium and Omega 3 problems if bone softening or anaerobic/aerobic fatigue is occurring.

Once again these are preventative measures, however, preventing further damage as he walks on it will decrease the recovery time.

i have had this for around 5 years now! and it seems to be getting worse ove the years. i have been to my G.P so many times and he has told me the same thing to rest it. so i have. but then when i go back to playing it gets worse. its so hard for me to take time out of playing because i play sussex and regional rugby. i can't throw these oppotunities away. and i dn't know if i will still have a place in the team if i take the time out to rest my injury. i think if i had a cast on it i would be forced to rest! it would leave enough time! but i dnt know how to go about it!

HELP!

Hi Baker
you don't say where your based but in the UK we don't use plaster casts as a treatment for the condition, that's a very old attitude to rehab!
You also don't say how old you are, as this condition only effectsgrowing children not adults. Osgood - Schlatters disease (correct spelling) is an inflammation of the patella tendon (kneecap tendon)where it inserts onto your shin bone, most people can feel a lump there naturally. This is where a childs growth plate is, the bone does not fuse in this area untill you have finished growing, the two "bones" pull apart to allow natural growth and is a normal occurance.
What happens with Osgood' is that repetative loading / shock and jarring to the knee with jumping or running etc increases the stress onto this area, causing increased inflammation and there after bone growth (of the bony bit you can feel).
The correct rehabilitation process is rest for 6 weeks and then a GRADUAL return to loading, ensuring that you are loading your joints correctly in the first place, and thus a gradual return to sport.
If you have had this for five years and are past the age of growing then you do not have Osgood-Schlatters disease, and need to be re assessed by a Sports Chartered Physiotherapist - go on the Association for Chartered Physiotherapists in Sports Medicine to find one near by (if your British!!)
hope that helps answer your questions.