Whoever they were: Osgood and Schlatter, they must have fielded countless complaints of knee pain in growing teens in order to name this surprisingly common knee condition after themselves.  If your growing child is complaining of knee pain and there's not been an injury to explain the symptoms, you may be dealing with a fairly common overuse syndrome.  Learn more about how over-training can affect the knee joints of growing adolescents.  While there are lots of explanations for knee pain, this is one of the most common, and learning more about it may save you a trip to the orthopedic surgeon's office.  When in doubt, it's important to get things checked out and we're happy to help.