A person familiar with the diagnosis says Miami Dolphins cornerback Sean Smith escaped serious injury when he hurt his left knee in the team's victory over Buffalo.

An MRI test Monday determined the injury was only a bruise, the person told The Associated Press, speaking on condition of anonymity because the Dolphins are not releasing details about the injury.

Smith, a fourth-year pro and Miami's best cornerback, can become a free agent this offseason. The Dolphins, who are out of the playoff race, conclude the season Sunday at New England.

---

Online: http://pro32.ap.org/poll and http://twitter.com/AP-NFL