Been having some knee pain on medium to long runs and on long bikes. All around the kneecap. Knees don't hurt on the bike but when I get off to run I'm hobbling for a good mile before the pain subsides enough to run normally.

On medium runs the knees will hurt after the run. During long runs the knees will start to hurt about mile 8 and throb until finished.

With my knee bent 90* if I put my hand on the outside of the kneecap and push in towards the opposite leg, I feel the pain. No other pain if I push on other parts of the kneecap.

Started in the spring as I started ramping up for a summer ironman. Haven't done anything different than any other ironman year. Bought new sneakers when it started, thinking my old pair were worn but didn't help.

Any thoughts as to what it could be.