The injury is believed to have occurred midway through the quarter when Fox and teammate A.J. Hawk converged on Marshall pass catcher Emanuel Spann.
"It happened in the first quarter," Fox said. "I'm not exactly sure what play it was. They ran a crossing route. I just made like a normal tackle. My arm hit his leg or his helmet. I'm not sure what it was but I know it was hard."
Fox left the game and had X-rays. He returned to the field at halftime in sweats with his arm in a sling and stayed there to cheer his team to victory.
He suffered a clean break to the radius, the inner bone of the forearm. He was scheduled to undergo surgery this morning, where a permanent plate would be installed in his arm.
"They're going to put a plate in that will stay in," Fox said. "Hopefully, as soon as the bone heals I can get back. The thing is with the plate in there holding it together, I won't have to have a cast or anything. It might take four to six weeks to heal. When I come back, I'll probably have to have a pad over it for protection."
Fox came into the season with more experience than any other current Buckeye, having played in all 39 games of his first three years and starting 29 games. He admitted it will be hard to be on the sidelines instead of on the field.
"Of course it's going to hurt but it's just one of those things you have to deal with," Fox said. "You don't know why it happens. Coach Tressel always says, `Lean not on your understanding.' That's a Bible verse. I just try to focus on that and I'll do whatever else I can to help this team. I can't play for a few weeks, but when I get back I'll be ready to go.
"My family was all worked up about it and everything. I was just telling them, `Guys, relax. It's not like a broke my leg or tore up my knee or something.' We'll see how it goes. It's just a bump in the road."
Defensive tackle Quinn Pitcock talked about pressing on without Fox, at least for the time being.
"That's a big loss for us, especially since he's a captain," Pitcock said. "With everything he's done here, he's a great player. But we've got some great players who will step up and fill his spot. We shouldn't step down at all."
OSU coach Jim Tressel also commented on Fox's injury.
"He'll probably not be back before the middle of the Big Ten schedule," Tressel said. "I know Dustin will be out a while. It's a shame."
In Fox's absence, sophomore Ashton Youboty filled in at cornerback. He finished with five tackles and one pass break-up.
"Ashton did well," Fox said. "He did a great job. He's going to have to help us over the next couple of weeks. We've got some tough opponents. I think he'll be able to do that. He's a tough kid. I'm happy he's able to do that.
"We've got guys who are capable and can play. Coach said when I get back I'll go right back in there, whether it's four weeks, six weeks or whenever."
Youboty was glad to get a chance to play, but unhappy over the circumstances, obviously.
"I feel bad for Dustin," he said. "It is his senior year and he worked hard and earned the position. I'm just happy for the opportunity. I'm going to make the most of it until he comes back. That's what I came here for, to get on the field and play ball.
"My coach (Mel Tucker) has a lot of confidence. I have a lot of confidence in myself. I believe we should be good. I mean, Fox is a better player. He has more experience, but I just need to get in there and get it done until he comes back."