Patellar Tendonitis and kneecap issues?

I had surgery on my left knee last August and was on crutches for 3 months which obviously put a large burden on my right leg and knee. I developed patellar tendinitis which has gone down some the last few months by doing what my doctor said, but it still doesn't feel quite right. When I straighten my leg and bend it, I have to sort of pop my kneecap back slightly. I'm very paranoid because I play a bit of basketball when I can and rely on quickness, but I remember in last years Finals when Kyrie broke his kneecap when he had patellar tendinitis when trying to stop sharply so I'm sort of wary of any correlation between the two. Are these issues directly related?