Detroit Lions rookie cornerback Terrion Arnold has been ruled out for the upcoming game against the Indianapolis Colts due to a groin injury. Despite being a full participant in practice on Friday and initially being considered questionable, Arnold's condition worsened, leading to his absence from the game. The first-round draft pick has been a key player for the Lions this season, starting all 10 games and contributing significantly on defense.

• Terrion Arnold's absence will impact the Lions' defensive strategy against the Colts.
• Arnold has been a solid performer for the Lions, making his injury a significant loss.