Giants' Bumgarner explains 'freak' accident that injured throwing shoulder

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San Francisco Giants star Madison Bumgarner opened up about the shoulder injury he suffered in a dirt bike accident.

The Giants ace finds himself on the disabled list for the first time in his eight MLB seasons, the result of a crash while dirt biking through Colorado mountains that sprained the AC joint in the left-hander's throwing shoulder.

Bumgarner, facing a months-long recovery timeline, shared details about the accident for the first time Monday, apologising on a few occasions because "I wish I had some kind of good story to tell everybody, but I don't".

"I'm not exactly sure what happened. It was a surprise to me, too," Bumgarner said at AT&T Park, spending 15 minutes fielding questions from reporters, via the San Francisco Chronicle.

"I wish I had some kind of cool story for you that it was some kind of crazy wreck, but it really wasn't anything spectacular, just super unfortunate. I was actually being pretty safe the whole time; it was just a freak deal. It happened right at the end. That's really it."

Bumgarner, an outdoorsman with plenty of riding experience, said he was wrapping up a two-hour run when his rental bike slipped on the trail.

His pitching shoulder broke the fall and took the brunt of the damage, but he also suffered bruised ribs. He was with two family members and said he was not speeding or being reckless.

Giants head athletic trainer Dave Groeschner was the first person Bumgarner called, he said. He then went to the emergency room upon returning to Denver.

It could not have come at a worse time for San Francisco, who have struggled in a National League (NL)-worst 6-13 start to the season.

Bumgarner was 0-3 with a 3.00 ERA in four starts, but had received just five runs in support. Two of those were home runs Bumgarner hit himself on opening day.

"It's terrible," he said of the timing. "Obviously that was not my intentions when I set out to enjoy the off day. I realise that's definitely not the most responsible decision I've made.

"It sucks not being able to be out here with my guys and try to help us win some games. It's just very unfortunate. I've talked to a lot [of] them. They know where I'm at, and everybody's been super supportive, too - the organisation, the guys, everything."

Bumgarner was not willing to set a date for his return, but as of now he fully expects to be able to pitch again this season.

"It's hard to put a timetable on it, but I would certainly be disappointed if I wasn't," he said.