Hey bro, we do this surgery on a daily basis. First off, getting aids from an allograft ( the achilles tendon graft ) is next to impossible. The graft is freeze dried and tested for everything. The way we do our ACL's is by using an auto graft. Meaning we use part of your own patella tendon as the graft. What we do is take about a 10mm bone block from the patella and split the patella tendon down to the point where it attaches to the tibia. This way you are getting back a graft taken from your own body and it has not been frozen at 200 degrees below zero for the past 6 mos. I dont care who you talk to, I have done this surgery literally thousands of times, this method works the best. Rehab is much quicker, basically cause you are not trying to stretch out a graft that has been frozen since the stone age. Also from expierence, the achilles grafts usually are a little long between the bone blocks which could lead to an instability in the knee. If your Dr. insists on using a cadaver graft, tell him to get with the times and at least use a patella tendon graft. Basically the only reason Docs use a cadaver graft or allograft is so they can save about 30 min off their operative time. My opinion to you my friend would be to get a second opinion from another doc, and do not let him send you to one of his partners either. Drop me an email or PM if you have any other questions and good luck.