SEAGULL.
Anterior Crutiate Ligament Tears are more easily diagnosed after some healing and a decrease in inflammation. The history and manner of the injury, along with certain physical manipulations of the knee during an exam are the best diagnostic tools generally. Often MRIs are of little value and sometimes done to make the patient feel better about the diagnosis, even though it does little towards making it. I certainly agree that if the first surgeon removed "alot" of meniscus he would likely have had the opportunity (and really the obligation) to view the ACL during the arthroscopy. Get the films/video and take them to the second surgeon. You never really said how he diagnosed the ACL tear. A physical exam, as I said, is the most predictive diagnostic tool....aside from actually seeing the tear with the scope. The film will also clearly show whatever damage there was to the meniscus and how much was removed.
ACL reconstruction is done using a portion of another tendon from your hamstring or elsewhere, or from a donor graft. Like the meniscus, the ACL cannot be repaired or sewn back together since it has no blood supply that allows it to grow back together. Google ACL repair and read up on it as there are pros and cons and you should make an informed decision. Have your surgeon show you the ACL on the arthroscopy video. You will be able to see the tear for yourself.....or see the ACL intact. Meanwhile consider crutches, corticosteroid/local anesthetic injections for the pain and to promote healing. Unfortunately it may take some time, physical therpay etc. to get you back on your feet.

