This may include things like environmental variables which include wind, chilly, dampness and warmth, and injury; together with interior elements like liver and kidney deficiencies, or Qi and blood stagnation. The easiest way to diagnose a PCL tear is to look at the knee for posterior sag at ninety levels https://www.theorthopaedicandpainpractice.com/what-happens-if-i-injure-my-posterior-cruciate-ligament/