TLDR
After starting Crossfit I developed patellar tendonitis (also known as patellar tendinopathy or “jumper’s knee”) in my left knee. I ignored the pain until it got to the point where I avoided full depth squatting or jumping as it hurt too much. I tried to rehab it on my own, but with no success. It wasn’t until after getting a PRP injection into the affected knee that it fixed my tendonitis and I was able to move again.