11 weeks post ACL op here (but I booked in 9 days after tearing it - private health insurance finally paid off!).
I was in the best shape of my life when I tore my ACL. The atrophy was astounding post op - within 24hours you will lose start losing muscle. Off crutches within 4 days. etc...
It takes 6 weeks for the grafts at each end of the replaced 'hamstring to ACL' ligament to bond to the bone. You can't really push things during this period. Lots of rehab at home... stretching the ligament a little more each day to get it moving. Lots of ice and rest.
And now I'm back to doing light leg curl and extension work since week 8 ish. light DB squats etc...
Not sure if even with a great base on strength, you will be able to rush things. The body takes time to heal.
In saying that I am just working upper body a lot more. But I miss DL's and Squats.
Rehab blows but its worth it. Lots of ice and rest between. Swelling starting to subside here over the past month, some definition returning to the quad.
Rate of improvement slows over time, so for me now it seems like a snails pace. I can kneel but can't quite let my femur come back onto my shin on my operated side just yet.
There are a number of other good threads on TN on ACL tears.
I went the hamstring version which I believe is the most suitable for most people.
I guess it generally takes Aussie Rules footballers a solid 12 months till they are back playing professional level sport again. They have the best docs, physios, supplements, etc available to them here in Oz, and it STILL takes 12 months.
Weights (DL's and Squats) being a close chain exercise may be able to back up to your previous peaks slightly quicker, as long as the knee is strong and stable (knee travelling over big toe and not caving in). Caving in would be the worst result as I understand. Would not want to reinjure it after going thru the operation and xx months of rehab.
Good luck! Any other Q's post here, will answer what I can.
Oh did I mention the rehab? So much rehab...