Feel your pain brother. Been there and done it too. I had a torn meniscus in my right knee and had it repaired 10 years ago. While the Dr was in there, he found an old ACL tear. I'm talking like 20 years old! He said that 75% had splintered away in the tear and simply fused onto my PCL. Needless to say, I don't run marathons!! Take care of yourself.