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At any rate, the list of high-level BJJ (and MMA) fighters who have been slowed down by knee injuries goes on and on: Kron Gracie, Xande Ribeiro, David Avellan, Dustin Hazelett, Bas Rutten, Roger Gracie, Tito Ortiz, Romulo Barral, Marco Ruas, Georges Ste-Pierre, to name a few.
Brazilian Jiu Jitsu (BJJ) was developed in the early 20th century by Mitsuyo Maeda, and focuses on grappling and ground fighting. BJJ is considered a combat sport and a self-defense system and uses submission holds, joint locks and choke holds to subdue the opponent. It is a very effective style in which a fighter can use little to no strength to subdue a much larger opponent.