Ankle and knee popping?

My left ankle has been popping for two years now, i think it was due to an injury in basketball where I came down on my ankle funny. It swelled for a week and was then fine. When i run, use stairs, or just move it, it will pop. My knee hurt a little over a year ago do to jumper's knee then came back. It all the sudden went away then it started to hurt on the inside of my right knee. I went to EOOC and he said it was ok and the popping was from me growing. That was 4 months ago. My knee still hurts sometimes and both appendages pop. I want to know why or how to stop it.