• Clinical science

Pediatric fractures

Abstract

Pediatric fractures often have distinct fracture patterns due to the unique properties of growing bones. The periosteum in growing bones is thicker and stronger than in adult bones, which is why children are more prone to more incomplete fractures, such as the greenstick fracture or torus fracture. In addition, the periosteum is metabolically active. This feature also explains why childhood fractures heal faster than fractures in adults. Salter-Harris fractures are fractures of the epiphyseal plate, also known as the growth plate or the physis of long bones. These fractures only arise in children and adolescents, whose skeletal growth is not yet complete. Salter-Harris fractures are classified into 5 types according to the extent of damage to the growth plate and joint involvement.

Incomplete fractures

  • Definition: fractures in which the fracture line is either absent, or does not completely traverse the width of the bone (an intact periosteum and cortex is seen on at least one side of the bone)
  • Mechanism of injury: usually a result of an indirect force applied along the long axis of bones such as the radius, ulna, or fibula (e.g, fall on an outstretched hand, fall from a height)
Type of incomplete fracture Radiographic findings Most common site Treatment
Torus fracture
  • Distruption of the cortex on the side of the compressive force, which appears as a bulge
  • Mild or no angulation at the fracture site
  • Stable fracture

Distal radius at the junction of the metaphysis and diaphysis

Immobilization with a splint or a cast for 3–4 weeks

Greenstick fracture
  • Disruption of the cortex and periosteum on the side of tension (convex side) with an intact periosteum and cortex on the side of compression (concave side)
  • Some degree of angulation is usually present

Diaphysis of the radius, ulna, or fibula

  • Acceptable angulation*: immobilization with a cast
  • Greater than acceptable angulation: closed reduction followed by immobilization with a cast
Bowing fracture
  • No disruption of the cortex or periosteum
  • Angulation is present

Diaphysis of the ulna (most common) or fibula

*Acceptable angulation on X-ray

  • 0–5 years: Lateral view: 20–25°; AP view: < 10°
  • 6–10 years: Lateral view: 15–20°; AP view: < 5°
  • > 10 years: Lateral view: < 10°; AP view: 0°

Minor angulations in pediatric fractures do not require manual reduction because they are often compensated during remodeling and growth!

References:[1][2][3]

Salter-Harris fracture

Overview

Anatomy

Clinical features

  • History of trauma (e.g., fall or collision)
  • Joint pain at rest or with movement
  • Swelling of the joint
  • Hematoma
  • Focal tenderness to palpation around the physis
  • Decreased range of motion
  • Inability to bear weight on the injured side

Mild clinical symptoms may lead to misdiagnosis!

Salter-Harris fracture classification

SALTER: S – straight across (or slipped) (type I); A – above (type II); L – lower (type III); TE – through everything (type IV); R – ruined or rammed (type V)

Diagnosis

Treatment

  • Salter-Harris types I and II
    • Closed reduction if displaced and immobilization in a cast with reevaluation after 7–10 days
    • In case of severe dislocation or concomitant injury: surgical intervention (as performed in Salter-Harris types III and IV)
  • Salter-Harris types III and IV
    • Open reduction is required to realign the joint surface because both these types affect the joint.
    • Surgical intervention includes open reduction and internal fixation (osteosynthesis) using wires or traction screws, followed by immobilization with a cast.
  • Salter-Harris type V
    • Treatment depends on age of injury at diagnosis.

Complications

References:[3][4][5][6][7]

Common fractures by location