Thank you physiobob and physiofixme

physiobob can you explain what concentric and eccentric exercises are?

also...I'm not an expert like you or the other physiotherapists on this forum and am not definitely not saying you're wrong, but I am almost certain that my knee problems are due to over training and I don't really understand how working on my calves, quads, glutes, or hamstrings will help because working on them was the problem.

here is some of the training I did if it helps, I did all heavy weights...and now i regret it
Deep Squats w/ barbell 3 sets of 5
deadlifts w/ barbell 2 sets of 5
lunges w/ barbell 3 sets of 6
calf raises on machine 3 sets of 8
and lots of explosive plyometrics training

i did the weights twice a week and plyometrics twice a week...that pattern continued for all of July and August, I started experiencing some problems in September and kept quiet about it because i thought it wouldn't be a problem, but that was a mistake and now it's pretty bad

if you can help me out, that'd be appreciated, thank you