Barwin went down in the first quarter when Houston defensive tackle Antonio Smith accidentally slid into him while they were chasing Joseph Addai on a running play. Barwin ripped off his helmet in obvious pain, and Houston coach Gary Kubiak joined medical staff on the field.
Barwin was lifted onto a cart, and several Texans surrounded Barwin before the cart left the field.
Barwin backs up All-Pro defensive end Mario Williams and serves as a third-down end that factors big into the Texans' run defense schemes.
AFC South blogger Paul Kuharsky contributed to this report. Information from The Associated Press was used in this report.