The fight ended after the first round. Poirier was awarded the technical knockout via a doctor stoppage and it was because of the gruesome injury McGregor suffered.
Poirier was able to control McGregor on the mat through much of the first round. McGregor had tried to put Poirier in the guillotine submission hold, but Poirier was able to get out of it and outmatch McGregor.
Toward the end, McGregor was able to get back up onto his feet. He tried to dodge a Poirier shot and when he stepped back, his ankle appeared to get caught underneath him.
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McGregor fell and after the round was over he appeared to signal that his ankle or leg was broken.