Phillip Rivers is currently injured and is listed as "questionable" for his next NFL game. That means that he might not play. I have a very experienced orthopedic background so I am going to explain to you people exactly what is going on inside the world of Phillip Rivers. Phillip Rivers is currently suffering from a sprained MCL. This stands for Medial Collateral Ligament. This occurred on the final play of the 3rd quarter. Unfortunately the MCL is one of the most powerful and important ligaments in the knee. A close 2nd would be the Reciprocal Philangis Ligament and rounding out the top 3 and number 3 would be the Binomial Artery-Manifold Ligament. I can't stress enough to you people how serious a knee injury like this really is. The Medial Collateral Ligament gains it's leverage from the fibula and is attached (binomially) to the carotid artery. So basically, this isn't kiddie stuff. The MCL's main function is to stabilize the knee bone itself while establishing and re-assessing the main bloodflow from the upper body bones to the lower body bones. Without the MCL, shin splints would be 10 times worse than they already are. On top of these functions, the MCL also regulates the simple proteins that help lubricate the knee joint itself. These simple proteins help make the knee bend and they are what makes leg lifts possible. An MCL injury tends to limit these simple proteins and can possibly (and retroactively) inhibit any white blood cells that may re coagulate the nervous system. Phillip Rivers' knee is hurt and it needs to be fixed before he can play football at 100%. Or he's going to be suffering from shin splints of biblical proportions.