How old are you? The reason I ask is that O-S is usually only an issue during the adolescent growth spurt that occurs in the early teens in males (especially athletes).
Treatment is pretty much just symptomatic; you just have to wait out the growth spurt. However, plenty of stretching for the quads and hamstrings can be of help, as can extra shock absorbent padding (insoles) for the sneakers. If you're involved in activities that involve direct blows to the knee area, you'll definitely want to get some kneepads to protect the tibial tubercles.