Knight suffered the injury while diving on a third-and-goal play late in the first half. X-rays were negative.
Bell, who threw a 7-yard touchdown pass to Jalen Saunders with 19 seconds remaining to lift the Sooners past their rival, finished 10-of-16 passing for 140 yards.
Before the injury, Knight had completed 3 of 7 passes for 28 yards and rushed for 47. He led the Sooners into field goal range late in the second half, allowing Oklahoma to tie the score at 10.
Kendal Thompson pass intercepted by Kevin Peterson at the OKSt 18, returned for no gain to the OKSt 18.
Will Caleb Lavey or Justin Gilbert put a stamp on their bids for Big 12 defensive player of the year? Lavey has been the foundation of OSU's strong defense throughout the season. His veteran presence and versatility is key. Gilbert has realized the potential he's shown since his true freshman season, becoming an NFL-level player before our eyes. One or the other could make a strong case for player of the year consideration with a strong final game at Boone Pickens Stadium.
Can OU's running game take over the game? The Sooners' ground game has been terrific, and Knight brings an added dimension with his running skills. OU has the potential to really test the physical nature of OSU's defense with its quarterback run game, the physical style of Brennan Clay and open-field brilliance of Roy Finch.
Does Clint Chelf deserve All-Big 12 quarterback consideration? Why not? If he leads the Cowboys to another win over a top 25 opponent and continues to play well doing so, Chelf would have an argument as good as Baylor's Bryce Petty. Simply put, Chelf has played his best during the biggest stretch of the year for OSU.
Will an unknown emerge as a Bedlam hero? Last year it was Clay, who won the game with an overtime touchdown run that left Cowboys safeties Shamiel Gary and Daytawion Lowe reeling. Who could it be this year?
Here are a few storylines in the Big 12 in Week 15:
No. 17 Oklahoma (9-2, 6-2 Big 12) at No. 6 Oklahoma State (10-1, 7-1), noon ET (ABC): Bedlam has become much more than an in-state battle. It’s had major Big 12 title ramifications in recent years as the Cowboys have risen to the top half of the conference. And the Sooners always have to be dealt with if any team hopes to secure a Big 12 title ring. This year, OSU features the Big 12’s best defense, an underrated offense and is coming off the Big 12’s most impressive win. But OU quarterback Trevor Knight could be the unknown factor on a chilly day in Stillwater. If Knight plays well, the Cowboys' road to a Fiesta Bowl berth gets tougher.
No. 25 Texas (8-3, 7-1) at No. 9 Baylor (10-1, 7-1), 3:30 p.m. ET (Fox): Baylor hopes to close Floyd Casey Stadium with a bang and Texas wants to prove it's not how you start, but how you finish. A share of the Big 12 title also is on the line for both teams. The Bears offense hasn’t looked as explosive in the past two games, but it still looks like it could explode at any time. But if Texas defensive ends Cedric Reed and Jackson Jeffcoat, who combined for five sacks against Texas Tech on Thanksgiving, continue to be a quarterback's nightmare off the edge, it could become a long afternoon for Bryce Petty.
Instead, the defeat opens up another at-large spot for a major-conference team. That team will probably come from the Big 12 or Pac-12 and play in the Sugar Bowl, the most likely candidates being Baylor or Oregon.
Oklahoma could also have a chance to get that spot with a victory over Oklahoma State on Saturday.