Interestingly it sounds similar. Is the corresponding leg tighter in the hamstring and calf?
If you google "patella tendonitis" and read the gumph about it it does sound similar, but seriously, go get it checked and or referred to a physio. I was blind without knowing what I can or couldnt or what not.
The phsyio advised no racing or hard strain on it, but in reading more about the condition, ive changed my cycling style to a high cadience for the past few days, and will continue to too, and I am noticing an effect. Am trying to range about 90-105 rpm and were its just easier to spin than grind with out it being jolty. Ive tended more to grind a big gear in the past, and, the resulting strain happened.
I had advised her I have swapped over to trainers and straps so theres a more cushioning effect than the hard road shoes, but, am wondering if this is any good or not as with the road shoes I at least have a float.. My exercises given indicated working the area and trying to walk/cycle normally, but I had allready changed my style so there was less pressure when starting off. She didnt mention much, but am sure come monday, (next apt) ill cover that in more details.
But yes, get it checked out.
David