I was about 11 years old when I was Diagnosed with Osgood Schlatters Disease, although I suspect I've had it much long. I'm 23 now and still have problems with my knees. From the ages of 11 - 15 i was monitored closley by the school doctor as I had a growing spurt that caused concern. I'm 6'5" now and well built but my knees still cause me pain, usually when i contract my quads. People say to me "you'll gorw out of it" or "just ignore it" but the fact is it damn well hurts like hell somedays. Ive been on painkillers, used ice packs, had cortisone injections (which i nearly whacked the doctor for, it felt as if he put the needle through my knee cap) but none have helped. I am soon to begin my instructors traning for a community self defence club. I was lucky to find this club as unlike most martial arts it allows anyone to take part regardless of any physical problems. This club has helped me alot as over the last 5 years of traning i have been able to slowly and safely increase my muscles strength around my knee and thus allowing my knee to take more weight without pain.
The follow are the things i do to keep the pain at minimum level.
Try to sleep with the leg stretched fully out, if i was to bend a leg i lie on my side where the bed can support the shifting weight.
Never sit in the back of a car where you can't strech the leg out. Sitting like this for 2 hours on a long trip and then standing up just causes my knee to collapse.
I was told by my doctor to keep up my diary products intake for the calcium. This actually seems to work as if i have periods of not eat or drinking diary products the pain seems to get worse.
Everyday try to get in some light form of excersie, for example walking the dog, just something to keep the knee going. I find that if i sit around all day the next day I pay for it.
Light streching of the leg muscles seems to help too. As my flexibilty has increased i have found the pulling pain on my knee joint has decreased.