25F w/ degenerative cartilage and a new knee pain

25F, 5'3", 120, White, about 1 day, left knee.

I have degenerative cartilage in both knees from sports. My right knee is actually worse. Asthma and TMJ, I feel are unrelated but hey. I'm used to pain in my knees and I can't twist certain was but recently when I bend my left knee with any pressure (think of a squat) I have extreme pain in my left knee. It's more towards the outer edge and it does not take a lot of pressure for the pain to appear. At approximately a 135 degree angle.

I am traveling for business so I cannot seek medical attention at the moment. If it gets extreme of course I would anyway. I will schedule an appointment with my doctor for a new x-ray when I get back. I've just never experienced this and I'd appreciate any insight someone may have.

Thank you in advance!