One year post injury
I blew out my quad tendon May 16, 2008, had surgery on May 25. Leg brace for 8 weeks, good PT, really started running again in January.
So far, so good. I have a running parter I workout with and we were pretty close in fitness before I got hurt, and I'm back again. I'm probably a little bit stronger than he is even. Running about 40 miles a week, including long (10 mile +) trail runs on Sundays. It still doesn't feel exactly the same as my uninjured leg, but the only activity I have to restrict is bike riding. Riding a bike makes my join tighten up so I try to take it easy, but running is fine.
If you have a good doc and are diligent about PT, my expereince suggests that after 12 months you have a good chance to be fully back in the saddle. I have a tough trail race in mid June, hopefully I survive that and live to tell the tale!