When a ligament tears, damaged fibroblast cells release inflammatory signals into the bloodstream. Platelets detect these signals as they pass by and release growth factors that trigger repair right at the injury site, leaving other tissues untouched.
How does the body know to heal the right ligament and leave the left ligament alone? The way that it knows that tissue is injured is if that ligament received a small tear. You broke a cell in that ligament called a fibroblast. And what that cell will do is it will start signaling into the bloodstream to say, hey, I'm hurt. That signal is inflammation. These are interleukins and cytokines. And what happens is a signal enters the bloodstream. A very special cell in your bloodstream called a platelet, is listening for that signal. And as it cruises by in the bloodstream, a platelet bursts and it drops off. Growth factors.
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