What happened to Conor McGregor's leg?!

Conor McGregor's coach, John Kavanagh has revealed more details about his fighter's gruesome broken leg, saying the Irishman sustained the injury when he kicked Dustin Poirier's elbow late in the first round of their UFC 264 lightweight fight on the weekend. 

McGregor's leg crumbled underneath him with just seconds remaining in the opening round, and the former featherweight and lightweight champion was unable to continue. 

Poirier believes the initial injury happened earlier in the round when he checked a low kick and was made worse when McGregor used the same leg to put power behind a punch shortly before the finish. 

McGregor vehemently denied those claims, and now Kavanagh has revealed how the injury really happened. 

It comes down to technique and stance. 

After a couple of minutes of being trapped against the cage, McGregor regained his feet in the dying stages of the round and engaged Poirier one last time on the feet. 

"He throws a leg-kick, he moves away, and then he threw a teep, and that was one of the techniques we definitely wanted to employ in this fight," Kavanagh said in an interview with UFC reporter Laura Sanko. 

"Being southpaw, that liver side is there, so we're looking to teep in that area.

"A teep is supposed to go in a horizontal motion, in and out. Whereas Conor threw it more as a karate-style technique - flicking from the knee to stab the ball of the foot into the abdomen.

"It's a good technique, but on opposite stance, it's a bit safer because of the positioning of the elbows. 

"But on same stance, there's a high danger of catching that elbow."

And that's exactly what happened, according to Kavanagh.

McGregor kicked Poirier's elbow, causing the fight-ending broken leg in similar fashion to Anderson Silva and Chris Weidman's broken legs in the past. 

"If you watch it back, you can clearly see that's where the fracture happened," he said. 

"He aggressively threw that kick, Dustin shelled with the lead hand and the foot wraps around.

"In similar fashion to poor old Silva and Weidman - they wrapped the shin around the shin - he wrapped the shin around the elbow. 

"He stands back on it and you can see the bone almost protrude through the skin.

"I don't know how he didn't fall there, but he comes in, they both exchange crosses, they step back on it and that's where you see that horrifying fold underneath. 

"That's the end of the contest." 

The Irishman was stretchered out of the Octagon, and later had an operation to repair the fractures

He is expected to make a full recovery, and in a video posted to social media from his hospital bed, McGregor took another shot at Poirier. 

"It was a hell of a first round, it would've been nice to get to the second round and to see what's what, but it is what it is - that's the nature of the business," he said. 

"A clean break of the tibia and it was not to be. 

"Dustin, you can celebrate that illegitimate win all you want, but you'd done nothing in there. 

"That second round would've shown all. Onwards and upwards we go, team. We dust ourselves off, we build ourselves back and we come back better than ever."