The knee was not designed to be hit with all that force at all those angles, ... It has very strong ligaments, but when that sudden force is applied to those ligaments, especially with a lot of torque, things tear.  -   Nicholas DiNubile     Quotes
The knee was not designed to be hit with all that force at all those angles, ... It has very strong ligaments, but when that sudden force is applied to those ligaments, especially with a lot of torque, things tear. Nicholas DiNubile
 Force