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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.
The most common sports injuries are: 1  Sprains and strains. 2  Knee injuries. 3  Swollen muscles.  Achilles tendon 1  injuries. Pain along the shin bone. 2  Fractures. Dislocations.