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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 overuse injury is runner's knee, a loose term that refers to several disorders, including patellofemoral pain syndrome (PFPS). These painful conditions are common among athletes such as runners and cyclists.