i had osgood schlatters its when the ligaments/cartilage grow slower than the bones very painful all but 2% clear up by 17 other 2% suffer cartilage damage i had miniscal tear and calcium deposits on bones ( they had to shave the Bones) which they only operated on after doing my ACL..................... is very painful but hey if your determined to carry on you can I did knees f***ed now though and am only 25