Pain 15 weeks post ACL reconstruction

Push but remember to back off at the pain - because of where you post-op, your graft is probably trying to vascularize right now. Also, you may already be aware, but, some ortho's warn against deep knee squats. Stating they'll do more harm than good to your knees, even though they'll beef up your legs! If you're doing shallow squats you're fine, though. For what it's worth! Good luck on your recovery.

I still had a lot of pain 4 months out, after ACL reconstruction & meniscus cleanup. Stay committed to your workout regimen; you're probably close to being able to do isolated leg extensions, and of course keep on hammering your hamstrings. The more you can grit your teeth and push through it, the better your knee will feel. I've heard that the pain is a bit worse with autografts (hamstring or pattelar) than with donor tissue, so you have that working against you. However your graft is probably close to vascularizing, much sooner than someone with an allograft, so there is a benefit to your misery.

Keep at it, you're going to get discouraged periodically, probably for the next 6 months, but remain committed to your recovery. Just think, if it weren't for the ridiculous frustration and constant pain, we'd just go right back onto the field and do it again! Your knee is going to need a minimum of 6 months (if you're 19) but probably closer to 10-12 months to begin feeling better if you're the average working, 3-times-a-week PT'er. Best of luck on your recovery, and remember there are plenty of other things to appreciate while you get your knee back. This is just something you can't rush.