From the reports right after the game it sounds more like a head injury than a broken neck. It was pretty brutal to watch, and quite worrisome especially seeing them giving him oxygen. From the CP Wire:
Zaun injured in collision
Blue Jays catcher Gregg Zaun was carted off the field Sunday after he was kneed in the side of the head while breaking up a double play in the bottom of the ninth inning of Toronto’s 5-4 loss to the Chicago White Sox.
Zaun walked with one out and took off for second base on John McDonald’s grounder. Third baseman Joe Crede threw to second to get the force on Zaun, who slid in. As second baseman Pedro Lopez jumped to make the return throw to first, his knee smacked into the side of Zaun’s head.
Zaun was down on for about 10 minutes and was fitted with an oxygen mask and a head and neck brace. He was unconscious for a few minutes, but was awake and made some movements before being driven off the field and taken to a hospital for further tests.
Paul Konerko and other Chicago players, who were huddled around him, said Zaun was having trouble breathing.
“It was scary,” Konerko said. “He was choking on something. That’s what everyone standing out there was a little bit worried about. It’s one thing to get knocked out, you get knocked out and you come to, but he was lifeless and it sounded like he was choking on something. He was gasping for air, but lifeless at the same time.
“It was getting to the point where, 10, 15, 20 seconds into it, you’re wondering if this guy is going to choke to death right here.’’
A Blue Jays spokesman said Zaun had breathing problems consistent with a head injury.
Toronto manager John Gibbons declined to comment after the game.
The game was delayed for 13 minutes, and ended two batters later.
“He is like the captain on the team,” Toronto pitcher Jason Frasor said. “It’s a tough loss. Who knows how long he is going to be out. I’m sure it’s going to be a few days at least. He’ll be missed.