Which type of fracture is characterized by the contraction of a tendon when the foot is inverted?

• A. Bedrom
• B. Jones
• C. Avulsion
• D. Vertical shear

Answer: (C)

The type of fracture characterized by the contraction of a tendon when the foot is inverted is an avulsion fracture. This type of fracture occurs when a tendon or ligament pulls off a fragment of bone due to forceful contraction or stress on the structure. In the scenario described, when the foot is inverted, certain tendons may contract strongly enough to pull on the bone they are attached to, potentially leading to an avulsion fracture.

Avulsion fractures are particularly common in areas where tendons attach to the bones, such as the ankle, particularly with violent movements or injuries. This helps clarify their mechanism of injury and typical presentation in cases involving tendon contraction during movements like inversion of the foot.

Other types of fractures mentioned in the options involve different mechanisms and situations. Understanding the specific conditions that lead to different fracture types is crucial in pathology.