Upper Back Ligament Symptoms Pain Popping

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What Is It?

The posterior cruciate ligament (PCL) and the anterior cruciate ligament (ACL) are two tough bands of fibrous tissue inside the knee joint. These ligaments connect the thighbone (femur) and the large bone of the lower leg (tibia) at the knee joint. Together, the ACL and PCL bridge the inside of the knee joint, forming an "X" pattern that stabilizes the knee against front-to-back or back-to-front forces. In particular, the PCL prevents the lower leg from slipping too far back in...

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