M hunch roughening of he back of the knee cap as the knee cap fails to track in it groove
Well that’s what happens to me.
Things that might help need checking
foot correctly aligned on pedal, cleat position
saddle not to low
tight hamstrings. When I toured I use to have to hamstring stretch alot
Loss of control of VMO. This the muscle above the knee on the inside. It kicks in as the leg staightens keeping the knee track in its groove. Stand with you finder on the muscle and your leg straight. Practive twitching it in burst of 6 twitches
PS You may need more help than an idiot (me) on the internet can provide