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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 majority of sports injuries involve the lower body, particularly knee injuries. One of the most common knee injuries is called patellofemoral syndrome. This diagnosis can be caused by a slip or a fall onto the knees, swelling of the knee joint or a muscle imbalance. The patella, or kneecap, should travel in the groove at the end of the femur or thigh bone.