Orioles infielder Wilson Betemit left Monday's Grapefruit League game with a Grade 2/3 posterior cruciate ligament in his right knee with other associated injuries, according to an MRI conducted Monday evening.

The 31-year-old Betemit hobbled into a car with his right leg in a full mobilizer following the Orioles' 12-9 win over Boston to get an MRI.

"I've got a heavy heart with Wilson, boy," Orioles manager Buck Showalter said.

The injury is not as serious as a torn anterior cruciate ligament, but the injury could still require surgery that could cost Betemit most -- if not all -- of his 2013 season.

"I’m going to think positive thoughts and obviously it doesn’t look good right now, but we’ll see. I’m more concerned about Wilson the human being as opposed to what he does for our club. We’ll see where he is physically. What is does for our club kind of pales in comparison. You don’t want to lose the person as much as the player."

With one out in the fifth inning, Betemit was running full-speed from first to second on a full-count pitch to Manny Machado when he stumbled along the basepaths and crumbled to the ground. It appeared that his right knee buckled before he went to the ground, rolled over and writhed in pain. Machado popped up to short on the pitch and Betemit was doubled off first.

Showalter, head trainer Richie Bancells and first-base coach Wayne Kirby ran to Betemit, who was rolling on the ground in obvious pain in the infield grass. He was helped onto a cart and was carted off the field.

"He’s pretty down right now, as we are," Showalter said. "Wilson is one of the better young men in the game. For him personally, hopefully we get lucky. But he’s a tough guy. For him to lay there, you know he was in some pain."