Nootropic,
I'm taking Care and Prevention of Atletic Injuries right now at my college.
Sorry to hear about your ACL.
Its a common, yet serious injury as you well know. I'm sure the Doctor has told you what you need to know already, so I'll spare you my knowledge on the topic...
How did you tear it? you probably felt and heard a "pop" followed by rapid swelling and pain....
Are you wearing a brace?
Make sure you rehab completely, or you might suffer from serious knee instability.
To answer your question: Physicians are still divided as to best treat this injury. It depends on the severity. I think Gene therapy could be used someday, getting the osteoblast cells or fibroblast cells or whatever cells to grow a new ligament or tendon. But unfortunately I don't think that will happen in time to help you. I'm sure it a decade or so away.
Meanwhile, hope you recover well...
