Frank Ragnow is officially back in retirement and the Detroit Lions will be without one of their top cornerbacks for most of the rest of the regular season.

The Lions placed cornerback Terrion Arnold on injured reserve Monday, Dec. 1, with a shoulder injury.

Arnold has been in and out of the lineup for the Lions this season due to a slew of injuries. He first injured his shoulder in a Week 5 win over the Cincinnati Bengals , when Lions coach Dan Campbell expressed concerns Arnold had suffered a long-term injury , and he returned last week from a two-week absence due to a brain injury.

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