Arnold (back) was a limited participant at Wednesday's practice, Darren Urban of the Cardinals' official site reports.
Arnold was listed as questionable ahead of last week's loss to the 49ers while managing the back injury, but he proceeded to suit up and played 36 offensive snaps, his highest total since Week 2. With a limited practice to begin Week 17, Arnold should be ready to go for Sunday's regular-season finale against the Rams so long as he avoids a setback. Arnold could be in line for another increased workload if neither Maxx Williams (ankle) nor Darrell Daniels (hamstring) can play.