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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 TFJ is what most people think of as the âkneeâ; it is where the femur, or thigh bone, and the tibia, or shinbone, connect. The other joint, the PFJ, is where the kneecap and the femur connect. Both joints are essential to the health and function of the knee, but the latter is often neglected.