Question

a machine operator gets his hand caught in the gears and his thumb gets ripped away from the joint. which of the following is the word that describes this?
avulsion
laceration
abrasion
involucrum

Explanation:

Avulsion is the tearing away of a body - part from its normal attachment. Laceration is a cut or tear in the skin. Abrasion is a scraping - type injury. Involucrum is related to bone formation in response to infection. The described injury of the thumb being ripped away from the joint is avulsion.

Answer:

A. Avulsion