Allen Park — The Detroit Lions waited on Theo Riddick as long as they could, but when it was clear the running back’s injured wrist wasn’t healing as well as they had hoped, they decided to finish the season without him.

The Lions placed Riddick on injured reserve this weekend, more than three weeks after he initially suffered the injury.

“You can see what he’s been able to do over time and obviously we make those decisions based upon our medical (staff),” coach Jim Caldwell said. “We have a plan, we put it together and we have timelines we work with. So we hit our timeline, we made adjustments.”

Riddick, the team’s starter following a season-ending injury to Ameer Abdullah in Week 2, led Detroit’s backs with 728 yards from scrimmage. He was a critical part of the passing game, averaging more targets and catches than last season, when he set the franchise record for receptions by a running back.

The week after suffering the injury against New Orleans, Riddick was a limited participant in practice, but he hadn’t practice the past two weeks. He was never spotted wearing a cast or even a brace.

Caldwell declined to comment whether Riddick would need surgery to fix his issue.

“You know we don’t talk about injuries and things of that nature,” Caldwell said.

Riddick has declined all interview requests since the injury was first reported.