An avulsion is a tearing away of the normal attachment of an anatomical structure. 

Avulsions may occur where muscles are attached to bone, where the tendinous muscle attachment tears off the bone, often taking with it a small bony fragment.

Another kind of avulsion can occur with the knee meniscus, where the outer rim can be torn off the tibia bone, where it may normally have been attached with a ligament.

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Understanding Acute Muscle and Tendon Injuries about the Knee

This article explains the more common kinds of acute muscle and tendon injury around the knee.

Injuries to muscle and tendon are some of the most common injuries seen in the doctor's office (refs 1 & 2). A large majority of these injuries are as a result of sporting participation but they are also common in everyday activities especially when the activity isn't part of a persons normal...

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