A low, risky hit within the pocket by Cardinals defense end Calais Campbell, who was fined for a low hit on Cam Newton earlier this season (he did, however, apologize for that hit).
The Miami Dolphins were able to celebrate a big December win Sunday over the Arizona Cardinals to improve to 8-5 on the season. The Cardinals (5-7-1) fell further behind in the race for the final NFC wild-card berth.
While Tannehill's had plenty of subpar moments in a Dolphins uniform - heck, one of those moments happened earlier today when he threw one of the worst screen passes you'll see - losing him for any period of time would be huge.
Miami had momentum and a 21-9 lead until Tannehill's injury.
Veteran quarterback Matt Moore took over for Tannehill on Sunday and helped Miami beat Arizona, but the Dolphins can't feel good about his chances of leading them to the playoffs.
Arizona Cardinals defensive end Calais Campbell (93) tackles Miami Dolphins quarterback Ryan Tannehill (17), during the second half of an NFL football game, Sunday, Dec. 11, 2016, in Miami Gardens, Fla.
Tannehill has had a good season for his standards; his best season, in fact, in certain statistical categories.
This is not a knock on Moore, who is a capable backup, but the Dolphins need more than that at this crucial point of the season.