Given all the attention to concussions people do forget that other injuries happen.
This season 51 torn ACL injuries happened at the NFL level. That is a lot of ligament repairing needed.
What is missing from every official report I can find is how many of these happen on artificial turf versus grass. If the league would release those numbers we could find out if this is just part of the sport, or is this something that might be preventable with a change in the type of material.