Trevathan was aiming to tackle Lions quarterback Jeff Driskel in the first quarter of the contest when his arm bent at a grotesque angle underneath the quarterback.
Here is the video of Trevathan's injury (viewer discretion is advised):
Immediately following the play, Trevathan jogged off the field and was looked at by trainers, and was sent to the Bears' locker room for further observation and treatment.
The Bears say that Trevathan has been ruled out for the remainder of the contest. He was replaced in the lineup by Nick Kwiatkoski.