Skip to content
My WebMD Sign In, Sign Up

Fitness & Exercise

Font Size

Posterior Cruciate Ligament Injury

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.

Posterior Cruciate Ligament

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.

After a PCL injury, people often think they only have a minor knee problem. They may try to go on with their usual activities. However, symptoms that can develop include:

  • Swelling (mild to severe)
  • Knee pain
  • Wobbly sensation in the knee
  • Trouble walking or bearing weight on the knee

Over time, a PCL tear can lead to osteoarthritis in the knee.

WebMD Medical Reference

Healthy Living Tools

Ditch Those Inches

Set goals, tally calorie intake, track workouts and more, all via WebMD’s free Food & Fitness Planner.

Get Started

Today on WebMD

Wet feet on shower floor tile
Slideshow
Flat Abs
Slideshow
 
Build a Better Butt Slideshow
Slideshow
woman using ice pack
Quiz
 

man exercising
Article
7 most effective exercises
Interactive
 
Man looking at watch before workout
Slideshow
Overweight man sitting on park bench
Video
 
6-Week Challenges
Want to know more?
Chill Out and Charge Up Challenge – How to help your tribe de-stress and energize.
Spark Change Challenge - Ready for a healthy change? Get some major motivation.
I have read and agreed to WebMD's Privacy Policy.
Enter cell phone number
- -
Entering your cell phone number and pressing submit indicates you agree to receive text messages from WebMD related to this challenge. WebMD is utilizing a 3rd party vendor, CellTrust, to provide the messages. You can opt out at any time.
Standard text rates apply

pilates instructor
Slideshow
jogger running among flowering plants
Video
 
Teen girl jogging
Article
Taylor Lautner
Article