Conversation so far:
where is the pcl located in the knee
The posterior cruciate ligament is located in the middle of the knee, next to the anterior cruciate ligament
what causes pcl injuries
Injuries to the PCL typically occur when the tibia is hit by an outside force while the leg is bent.
what are the symptoms of a torn pcl
A torn PCL is observed with swelling in the back of the knee, pain, and sometimes bruising. There may be difficulty walking or the knee may feel unstable.

Question: what is the most common grade of tear
Self-contained rewrite: what is the most common grade of pcl tear