i have a problem that sometimes if i turn my foot at an odd angle while my knee is bent, my knee locks... it really hurts and i have to really try hard to straighten it out and it makes a loud pop. It feels like a tendon on the outer part of the knee slides out of place or something. Is this a torn miniscus? It happens about once a year now but used to happen every month or so about 5 years ago. If I do nothing about it will it happen more often when i get older?