QuestionJuly 20, 2025

A 14-year-old girl has fallen from her bicycle. She sustained injuries when she landed with her arm extended to catch her fall. According to the principles of indirect mechanisms of injury, which of the following bones is least likely to have been injured in this fall? A. Clavicle B. Thoracic vertebra C. Ulna D. Radius

A 14-year-old girl has fallen from her bicycle. She sustained injuries when she landed with her arm extended to catch her fall. According to the principles of indirect mechanisms of injury, which of the following bones is least likely to have been injured in this fall? A. Clavicle B. Thoracic vertebra C. Ulna D. Radius
A 14-year-old girl has fallen from her bicycle. She sustained injuries when she landed with her arm extended to catch
her fall. According to the principles of indirect mechanisms of injury, which of the following bones is least likely to have
been injured in this fall?
A. Clavicle
B. Thoracic vertebra
C. Ulna
D. Radius

Solution
4.0(226 votes)

Answer

B. Thoracic vertebra Explanation 1. Understand the mechanism of injury Falling with an arm extended typically results in force transmission through the arm. The most common injuries involve bones directly in the path of force transmission. 2. Analyze force transmission path Force travels from the hand to the forearm (radius and ulna), then to the upper arm (humerus), shoulder (clavicle), and finally to the spine (thoracic vertebrae). 3. Identify least likely injured bone The thoracic vertebra is least likely to be injured because it is not directly in the path of force transmission during a fall onto an outstretched arm.

Explanation

1. Understand the mechanism of injury<br /> Falling with an arm extended typically results in force transmission through the arm. The most common injuries involve bones directly in the path of force transmission.<br /><br />2. Analyze force transmission path<br /> Force travels from the hand to the forearm (radius and ulna), then to the upper arm (humerus), shoulder (clavicle), and finally to the spine (thoracic vertebrae).<br /><br />3. Identify least likely injured bone<br /> The thoracic vertebra is least likely to be injured because it is not directly in the path of force transmission during a fall onto an outstretched arm.
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