- When the Houston Texans lost to the San Francisco 49ers in December 2017, quarterback Tom Savage suffered a horrendous blow when he hit the ground and his head snapped back. Savage appeared to have suffered a seizure along with a concussion. He was taken to the sideline but cleared by doctors and returned to the field only minutes later.
- In September 2017, Chicago Bears linebacker Danny Trevathan struck Green Bay Packers wide receiver Davante Adams with the crown of his helmet, sending him to the hospital. The NFL reduced Trevathan’s punishment from a two-game suspension to a single contest.
- Similarly, in October 2017, Baltimore Ravens quarterback Joe Flacco suffered a concussion after Miami Dolphins linebacker Kiko Alnso leveled Flacco as he was sliding to the turf in a defenseless position. Alonso did not receive a suspension or a personal foul after this event.