Aspinall, sixth in the UFC heavyweight rankings, fell back into the centre of the octagon clutching his right knee after landing a heavy leg kick seconds into the match, with Curtis awarded the win by TKO as his opponent could not continue.
"Today is surgery day... I've suffered a torn MCL, a torn meniscus, and some ACL damage so I'm gonna get that fixed today," Aspinall said in a video on social media.
"Thank you for all the support, I really appreciated it, I've had so much love since the accident. I'll see everybody on the other side!"
Aspinall was on a five-match win streak before his first ever defeat in the UFC since making his debut in July 2020.