I tore my PCL about 4 years ago while wakeboarding. I have not had it repaired and I have to wear a brace everytime I ride to keep my leg from folding back on itself.
My doctor advised that I not have surgery to repair it. He said that the PCL, unlike the ACL, is a very thick ligament and it cannot be repaired to be as good as new. Therefore, if the PCL cannot be restored to original strength it isn't worth the risk of an invasive procedure to try and repair it. He said that if I had torn both my PCL and ACL, they would attempt to repair my PCL while they were in there repairing an ACL.
This sounded a little odd to me, so I did some research on the subject and it turned out that my doctor was correct. Living without a PCL is just something I have to deal with. I can't do anything beyond walking unless I have my brace on. Eventually my bones will wear out the cartilage in my knee and I will need to have a knee replacement. He said I should have another 15-20 years before I need to have that done though. At that time he suggested they repair my PCL as long as they were in there.