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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.
Other structural conditions that make sports injuries more common include: 1  lumbar lordosis: forward curve in the lower spine. 2  patella alta: a kneecap that's higher than usual. 3  high Q angle: kneecap displaced to one side, as with knock knees.