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Avulsion fracture

What is an avulsion fracture?

An avulsion fracture is an injury to the bone. Basically it is a fracture that occurs at the location where a tendon or ligament attaches to the bone. This tendon or the ligament pulls off a piece of the bone along with it instead of ligament tear. An avulsion fracture can occur anywhere in the body, most commonly in the knee joint.

Mechanism of avulsion fracture

When a muscular contraction force is stronger than the force holding the bone together, in that situation this type of injury occurs.

Causes of Avulsion fracture
  • Sports injury – like football, basketball, volleyball, cricket
  • Road traffic accidents
Types of avulsion fractures in knee joint
  • ACL Avulsion
  • PCL Avulsion
What is the difference between ACL, PCL ligament injury and ACL, PCL Avulsion fracture?

In ACL, PCL, ligament injury, the ligament is torn. Whereas in ACL, PCL avulsion injury, the ligament is intact but the ligament attached with the bone is fractured and pulled off. The commonest site of bone pulling is seen at the tibial attachment site.

Symptoms of ACL, PCL avulsion fracture
  • Pain
  • Inability to perform any activity due to intense pain
  • Swelling in the knee area, within hours of injury
  • Inhibited range of motion
  • Inability to bear weight or a general feeling of instability

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