By Ashley Dunkak

DETROIT (CBS DETROIT) – After more than a season and a half on the physically unable to perform list, running back Jahvid Best has been released by the Detroit Lions.

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Best, chosen 30th overall by the Lions in 2010, played in all 16 games his rookie year but was limited to six outings in 2011 because he sustained a pair of concussions, one in preseason and one in the regular season. While Best reportedly stayed positive about returning, doctors never cleared Best to return to the field.

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Best, who averaged 4.6 yards per carry and 10.6 yards per catch through six games in 2011, dealt with concussions in college as well, most notably one in which he lost consciousness on impact.

Lions teammate Nate Burleson told earlier this year that he had advised Best to retire.

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“Just being a guy that loves him as an individual versus him, as a player, I just told him, ‘Honestly, I’d rather see you healthy at 65 than healthy at 25,'” Burleson said.