Knee injury?

i slightly tore my meniscus and acl about 2.5 years ago. Doc said it was slight so probably wont need surgery. So yesterday, i am playing basketball i am running and my leg gets tangled with someones leg and i fall straight to my bad knee and it bent and twisted a little bit(like when little kids sit on their knees.) I was in pain and a limp. Now the right side of my right knee is killing me. its like right where my calf muscle is connected to the knee on the back. Im in pain,but i can still walk and it is swollen on front of the knee cap and some on the side. Do you tink i could have torn something?