What is the most common fracture encountered in a baby during delivery?

RML 2023

Child Health Nursing (Pediatrics)

Easy

Appeared in: RML 2023

Explanation

The clavicle (collarbone) is the most frequently fractured bone in newborns during the process of labor and delivery.
This injury is common, with an incidence of approximately 5 per 1000 live births, and is often an unavoidable complication of vaginal birth.
The primary cause is compression of the clavicle against the maternal pubic bone, especially when the baby's shoulders have difficulty passing through the birth canal (shoulder dystocia).
Other significant risk factors include a large birth weight (macrosomia) and breech delivery.

Option A: Fractures of the humerus are rare in newborns.
Option C: Fractures of the ulna, a bone in the forearm, are extremely rare during delivery.
Option D: Femur fractures are also rare birth injuries.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Common neonatal fractures during childbirth as background academic context rather than a clinical decision trigger.
Nurses must perform a thorough newborn assessment, including checking for signs of a clavicle fracture. Key signs include crepitus (a crackling feeling over the bone), a palpable deformity, and an asymmetrical Moro reflex where the infant does not move the affected arm.
Management is typically conservative. It involves careful handling of the infant to minimize pain and may include immobilizing the arm by pinning the infant's sleeve to their shirt. The fracture usually heals rapidly within a few weeks.
What if the delivery was an elective Cesarean section? The risk of a clavicle fracture would be dramatically reduced, as it is primarily a complication of the mechanical forces during vaginal passage, especially shoulder dystocia.

How to Approach the Question

First, identify the keyword in the question: "most common". This indicates you need to recall the relative frequency of different birth injuries.
Analyze the options provided: Humerus, Clavicle, Ulna, and Femur are all long bones.
Think about the mechanics of a vaginal delivery. The baby must navigate a narrow passage. Consider which bone is most exposed to compressive forces.
The clavicle is located at the shoulder and is one of the first bones to ossify. It is highly susceptible to compression against the mother's pubic bone, especially in cases of a large baby or shoulder dystocia.
Contrast this with the other bones. The humerus and femur are larger and more protected within the limbs. They are typically only fractured during specific, less frequent obstetric maneuvers like breech extraction.
Based on this anatomical and mechanical reasoning, conclude that the clavicle is the most vulnerable and therefore the most commonly fractured bone during birth.

Concept Tested & Keywords

QNb8BftZkCXVwOx0v70q7K

E6 Obstetrics Williams p. 20-38

E6 Nelson Textbook of Pediatrics(2024) — Volume 2 p. 2090-2092