The latest gruesome injury inside the octagon is featherweight Calvin Kattar UFC knee injury. During the bout against Arnold Allen, Kattar landed awkwardly popping his knee, which eventually cost him the fight. The Calvin Kattar UFC knee injury at UFC Vegas 63 cost the featherweight contender a lot, as he inflicted it himself, after landing … Continue reading Horrific Calvin Kattar UFC Knee Injury In Slow Motion (VIDEO)