I have been running 8 years - done 25 marathons in that time and many shorter races but been really lucky and never had any injury that's put me out for more than a few days. Until now.... i have very painful pains around the base of my kneecap and up the inner side. Initially i thought it was tendinitis but the pain is slowly beginning to move around the sides of the kneecap. It hurts driving, sitting for too long and i also wake in the night with pains. Its been sore for at least 4 months now but is getting worse all of a sudden. I can run on it although i do get sharp pains and i can deffo feel a lack of power in the joint. Read a lot about patellar tendinitis and i need to strengthen quads etc but my legs are strong enough as i run steep hills daily and can maintain a strong pace up them (7mm) - could i be looking at something else being wrong? i have read that tendinitis can sometimes not be cured by rest alone. Worried that my NYC marathon in November is in danger as i am in the training window now.