In reply to Gills:
I ruptured my PCL in a mountainbiking accident last October and it's at the point where it is almost back to normal, but heelhooks where I need a lot of pressure really hurt. My advice would be to give it as much time as it needs because an ACL/PCL injury is serious business. Your ligament is in a vulnerable state and needs as much rest as it does rehabilitation; further abuse can make the knee much worse - perhaps even do permanent damage. It is absolutely critical how well you respond to the injury.
Foolishly, I started climbing again as soon as I regained enough flexibility to move my leg back past 90-degrees. There are multiple incidents I can remember which worsened the injury from what was only a stage 1 to a stage 2 rupture. It has set me back at least a year in my training and has just made life pretty shit in general.
Make sure you get your quadriceps and hamstrings as strong as you can too. Any muscle around the knee that has a supporting role, you will benefit greatly not just in strength terms, but in injury/pain prevention.
Have patience, young padawan. Stay safe.