Which of the following tarsal bones is most commonly fractured?

AIIMS Jodhpur SNO-2023

Applied Anatomy

Easy

Appeared in: AIIMS Jodhpur SNO-2023

Explanation

The calcaneus (heel bone) is the largest tarsal bone and is positioned to absorb significant impact during weight-bearing activities.
Due to its size and position, it is the most susceptible to fracture from high-energy axial loading forces, such as those experienced in a fall from a height.
Clinical data shows that calcaneal fractures account for approximately 60% of all major tarsal bone fractures.
The mechanism often involves the talus being driven directly into the calcaneus, leading to complex fracture patterns.

Option A: Fractures of the cuboid bone are relatively rare and typically do not occur in isolation.
Option B: While the navicular bone can fracture, it is more commonly associated with stress fractures from repetitive overuse in athletes rather than being the most common acute fracture.
Option C: The talus is the second most commonly fractured tarsal bone, not the most common. Its fractures are clinically significant due to the high risk of avascular necrosis.

Visual 1: Anatomical Diagram - A lateral and superior view of the foot's skeleton, clearly labeling the calcaneus, talus, navicular, and cuboid bones to help visualize their relative positions.
Visual 2: Infographic - An illustration showing the mechanism of an axial loading injury, with an arrow depicting the force of a fall traveling up through the heel, causing a calcaneal fracture.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Anatomy and common fracture patterns of the tarsal bones as background academic context rather than a clinical decision trigger.
A nurse assessing a patient who has fallen from a height must maintain a high index of suspicion for a calcaneal fracture, even if other injuries seem more apparent.
The assessment should include checking for heel pain, swelling, and the inability to bear weight. The presence of bruising on the sole of the foot (Mondor's sign) is a key indicator.
Crucially, about 10% of patients with calcaneal fractures also have an associated lumbar spine compression fracture. Therefore, a thorough secondary survey, including spinal assessment, is a patient-safety priority.

How to Approach the Question

First, identify the core of the question, which is asking for the 'most common' fracture among the 'tarsal bones'.
This is a factual recall question based on anatomical and epidemiological knowledge.
Mentally picture the anatomy of the foot. The calcaneus is the large heel bone that makes initial contact with the ground and bears significant force.
Recall or deduce that high-impact forces, like falls, are a common cause of severe fractures. The heel bone is directly in the line of this force.
Compare the options. The calcaneus's role as the primary weight-bearing and impact-absorbing bone makes it the most logical answer for the most common fracture site from high-energy trauma.
Eliminate the other options based on their known fracture patterns: talus is second, navicular is prone to stress fractures, and cuboid fractures are rare.

Concept Tested & Keywords

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