Paediatric Cervical Spine
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Cervical spine injury (CSI) in children is unique in both the wide anatomic differences and the variety of mechanisms of injury. In children, the head is larger relative to the body, resulting in a higher center of gravity and fulcrum of neck motion; there are multiple vertebral ossification centers; and the ligamentous structures are lax. Mechanisms of CSIs also differ between children and adults. The adult cervical spine is are injured predominantly in motor vehicle crashes (MVCs) and falls; children experience a broader range of traumatic events that place them at risk for CSIs, however much of the literature describes MVCs as a common mechanism of injury and some have suggested that efforts should be focused on refinement of motor vehicle restraint devices in young school-aged children.
There are several anatomical difference in the paediatric cervical spine that can influence injuries that may occur:
- more horizontal facets
- flatter vertebral bodies
- smaller occipital condyles
- ligamentous laxity
- unfused synchondroses
- un-developed uncinate processes and absence of uncovertebral joints (C3 to C7) - Although the uncinate processes are present in utero, they start to enlarge gradually between the ages of 9 to 14 years reaching their maximum height.
- a larger head to body ratio which raises the fulcrum of motion- the fulcrum of motion in the cervical spine in children is at the C2-C3 level; in the adult cervical spine, the fulcrum is at the C5-C6 level.
The immature spine is hypermobile because of ligamentous laxity, shallow and angled facet joints, underdeveloped spinous processes, and physiologic anterior wedging of vertebral bodies. Incomplete ossification of the odontoid process, a relatively large head, and weak neck muscles are other factors that predispose to instability of the paediatric cervical spine. The fulcrum of motion in the cervical spine in children is at the C2-C3 level; in the adult cervical spine, the fulcrum is at the C5-C6 level.
Developmental maturation of the paediatric cervical spine occurs in school age children, at this age the synchondroses have fused, and the fulcrum of motion of the cervical spine has shifted caudally. When referring to younger children the literature often uses under 8 years old, and older children as over 8 years old. By the time a child is 8–10 years old, the cervical spine reaches adult proportions. Injury patterns in children, once they have reached the age of 12, more closely resemble those of adults.
Normal anatomic variants include pseudosubluxation, absence of cervical lordosis, wedging of the C3 vertebra, widening of the predental space, prevertebral soft-tissue widening, intervertebral widening, and “pseudo–Jefferson fracture.”=
Although CSI is uncommon in children, accounting for only 1–2% of paediatric trauma, the clinical implications of failure to correctly diagnose CSI are significant. Spinal injuries in children are more likely and have significant consequences with permanent neurologic damage in up to 66% and mortality as high as 40%.
Younger children have more injuries of the upper cervical spine, whereas children in the older age group sustain more injuries of the lower cervical spine. Although motor vehicle accidents and falls are common in children, young children under 8 years of age are more vulnerable to pedestrian and inflicted injuries, whereas older children above 8 years of age most commonly sustain recreational and sports-related injuries.
Cervical spine injuries in younger children are usually seen in the upper cervical region owing to the unique biomechanics and anatomy of the paediatric cervical spine. Younger children have a relatively higher fulcrum with a larger head, predisposing to occipital cervical injures, with distraction and ligamentous injuries being more common than bony injury. Unfused synchondroses, especially at the level of the dens, are susceptible to trauma and notoriously difficult to diagnose. Knowledge of the normal embryologic development and anatomy of the cervical spine plus familiarity with anatomic variants is important to avoid mistaking synchondroses for fractures.Spinal cord injuries without radiologic abnormalities (SCIWORA) can occur due to the ligamentous elasticity and flexibility of the paediatric vertebral column which can withstand injuries without evidence of deformity, these are only seen in the younger age group. SCIWORA was also frequently associated with sports.
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