I got diagnosed with the same thing last week, the physio gave me 2 exercises which I havent seen mentioned that might be worth a go!
they're designed to strengthen your arse muscles, as apparently they pull on the outside of your thigh and help the patella sit in the right place.
One is the 'clam', lying on your side with your hlps pointing just forward of vertical (so your belly button is pointing at the floor a bit), legs bent at about 90 degrees. Then slowly lift & then lower your top leg, making sure it's your bum not your thigh moving it. Repeat x 20.
Second is the leg raise, again on your side rolled slightly forward (a bit more than before), with legs straight. Lift and lower top leg. Repeat x 20.
Surprisingly painful, which must mean it's working, right? 2x daily.