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PCL connects

The posterior cruciate ligament (PCL) is a ligament within the knee. Ligaments are tough bands of tissue that connect bones.

The PCL - similar to the anterior cruciate ligament (ACL) - connects the thigh bone (femur) to your shin bone (tibia). Although it is larger and stronger than the ACL, the PCL can be torn.

PCL tears make up less than 20% of injuries to knee ligaments. Injuries that tear the PCL often damage some of the other ligaments or cartilage in the knee, as well. In some cases, the ligament can also break loose a piece of underlying bone.

Causes of PCL Injuries

PCL injuries are often due to a blow to the knee while it's bent. Common causes include:

  • Striking the knee against the dashboard during an auto accident
  • Falling on the knee while it's bent

Sports are a common cause of PCL injury. These injuries are especially common in:

  • Football
  • Soccer
  • Baseball
  • Skiing

An injury to the PCL can cause mild to severe damage. Doctors classify PCL injuries in these groups:

  • Grade I: The PCL has a partial tear.
  • Grade II: The ligament is partially torn and is looser than in Grade I.
  • Grade III: The ligament is completely torn and the knee becomes unstable.
  • Grade IV: The PCL is damaged along with another ligament in the knee.

PCL problems can be acute or chronic. Acute PCL problems are due to a sudden injury. Chronic PCL problems involve an injury that develops over time.

Symptoms of PCL Injury

Most people don't feel or hear a "popping" sensation in the knee after a PCL injury. This is more common with an injury to the ACL.

Source: www.webmd.com
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