PCL is posterior cruciate ligament, aka, the ligament on the back. (the knee has four on each side; imagine a diamond)

All the while I tried pushing my knee in to see if it moves.

It doesn't. And I found out that it's because it sinks in at rest. So I should have tried pushing it from behind instead.

Bingo.



And no, I'm not going to test if it goes sideways coz I don't want to aggravate the partial tear for my 'side' ligament. I'm not going to test my other knee either.

I don't like to know things.