Hammer I'm sorry to hear about your son's injury however they have made great strides that is helping athletes avoid a lifetime of pain. I have had 3 concussions, broken ankle, torn ligaments in both ankles, 2 meniscus operations, broken nose and most of my teeth knocked out and a lot of it was from sports, car accidents and teenage incidents. While I do have pain every day because along the way I developed Arthritis however I workout everyday doing something. For my knee I got a PRP shot and my knee feels better than when I was 30 (I'm now 72) and I go to at least 3 HS or College Football games a week plus my grand children's games during the week.
I tell this to all of you because if you stay active the pain is very livable.
I have a very good P/T place that I swear by called North Island 631-798-8898