Opponent Tom Aspinall checked a kick from the Frenchman early in the first round and a sickening crack rang out around the arena at Cage Warriors 101.
Aspinall immediately stepped away as the referee rushed to Boukichou, who was on the ground in agony, in a video released on the promotion's Twitter.
UFC star Anderson Silva suffered a similar injury in his second meeting with Chris Weidman in 2013.
Aspinall improved his record to 6-2-0, while Boukichou faces months of rehab.
Following his main event woe in Liverpool, the stricken ace saw plenty of supportive comments on social media.
One fan posted: "Ugh, poor guy.. that's almost as gnarly as Silva's one. Hope he makes a full recovery."
While another added: "Unlucky lad, all the best and a speedy recovery."
Others commented on the awful sound made as the kick was deflected.
And there was plenty of praise for Aspinall after he put his rival's safety first.
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