The rocker split a bone in his right hand during recording sessions for the British band's new album Am, and surgeons had to insert a metal plate under the skin to help heal the injury.
Helders has remained coy about how the damage occurred, but now he has suggested he lashed out at a wall in frustration and immediately regretted it.
He tells rock magazine Q, "It wasn't a fist fight with a person, no. I didn't hurt anybody, except for myself. It was... a bizarre incident... with a wall... that was harder than I expected... The next day I did (feel like a fool)... It was just me being stupid.
"I weren't (sic) even that angry, cos (sic) I'm not an angry person. I was just messing about, drunk. Everyone I've told said, 'We've all done it.' I just managed to hit the wrong wall. The bone popped out - not out of the skin but it was stuck up. I went to my girlfriend, 'I think we need to go to hospital.' They put a plate in it. I'm having it taken out at Christmas."
However, Helders' bandmate Alex Turner later cast doubt on the drummer's explanation for the injury, adding, "Oh, is that what he told you?... Yeah, he's been telling some people that..."
The broken hand is the second major injury Helders has suffered in recent years - in 2010 he broke his left arm sparring with a pal during a workout in a boxing ring.