https://www.espn.com/nfl/story/_/id/278 ... ast-season
""The number went up even with the rule changes the league has made over the past few years," Sills said. "So we know there is more work to be done there."
"Meanwhile, concussions during training camp practices dropped by 33.3 percent, from 45 to 30, after a series of league initiatives that included the elimination of the Oklahoma drill. Reducing practice concussions was one of three keys to the league's "call to action" after the 2017 season."
"There was a reduction in ACL and MCL injuries during the preseason as the league begins work on reducing lower extremity injuries. ACL injuries dropped from 28 to 16, while MCL injuries were down to 29 from 36. Most of the league's lower extremity initiative, which includes a study of footwear and its impact on various playing surfaces, remains in its early stages."