Toddler's Fracture

Pediatric Tibial Shaft

Location: Fracture typically occurs in the distal third to middle third of the tibial diaphysis.

Why spiral? Rotational force with fixed foot creates spiral pattern. The periosteum is thick in children and often remains intact, limiting displacement.

Blood supply: Pediatric tibia has excellent blood supply. Union is rapid (3-4 weeks) compared to adults.

Why Toddlers Are Susceptible

Gait immaturity: Wide-based, unsteady gait. Falls are common during play.

Foot fixation: If foot is fixed (on ground, in shoe) and body rotates, spiral force transmitted to tibia.

Bone properties: Young bone is more porous and less mineralized. Fails under torsional stress but may not displace due to thick periosteum.

Classic Toddler's Fracture

Location: Distal to mid tibial diaphysis.

Pattern: Spiral or oblique, non-displaced or minimally displaced.

Key feature: The fracture is often subtle or invisible on initial X-ray. Look carefully for a faint spiral line or cortical discontinuity.

Toddler's Fracture Variants

Cuboid fracture: Can occur in toddlers with similar mechanism. "Cuboid toddler's fracture."

Calcaneal fracture: Rare but reported in this age group.

Fibular fracture: Isolated fibular fracture in toddler is less common but can occur.

Key point: Any lower limb bone can sustain low-energy fracture in this age group.

X-ray Protocol

Standard views: AP and lateral tibia/fibula (full length including ankle and knee).

Internal oblique view: May reveal the spiral fracture line when AP/lateral are negative.

What to look for: Subtle spiral line, cortical irregularity, soft tissue swelling. The fracture is often NON-DISPLACED.

When X-ray is Negative

Repeat X-ray at 2 weeks: Most reliable. Shows periosteal reaction and early callus confirming fracture.

Bone scan: Very sensitive but involves radiation. Rarely needed.

MRI: Can show bone marrow edema and fracture line. Reserved for atypical cases.

In practice: Most cases are treated clinically with cast. If improving at 2 weeks, diagnosis confirmed.

Cast Treatment

Options: Above-knee cast (AKC) or below-knee cast (BKC). Both are acceptable.

AKC advantages: Controls rotation better. Tolerated well by toddlers (they adapt quickly).

BKC advantages: Lighter, allows knee motion.

Duration: 3-4 weeks. Healing is rapid in this age group.

Follow-up: X-ray at 2-3 weeks to confirm healing. Remove cast when callus visible.

Alternatives to Cast

CAM boot: Can be used in cooperative older toddlers. Less reliable compliance.

Observation: Very minimally symptomatic cases may be observed, but cast is generally preferred for comfort and to allow mobilization.

Key point: Cast is simple, well-tolerated, and definitive. Most practitioners prefer casting.

Cast Care Instructions

Parental Education: Crucial for successful management.

Keep it Dry: Plaster cast must stay dry. Fiberglass with waterproof liner can get wet (if specified), but standard wool padding must be dry.

Skin Care: Check skin at cast edges for redness or rubbing. Do not put items down the cast to scratch (risk of infection).

Circulation Checks: Check toes for color (pink), warmth, and movement. If toes are cold, blue, or swollen, seek medical attention.

Activity: Child can crawl or scoot. Walking on cast is generally allowed if reinforced (walking cast), but some prefer non-weight bearing for first week for pain control.

Red Flags: Uncontrolled pain, fever, bad smell from cast, cast becoming loose or tight.

Rehabilitation

After Cast Removal:

• Stiffness: Minimal in toddlers. Usually resolve spontaneously within days.
• Limping: Child may limp for 1-2 weeks out of habit or mild stiffness. This is normal.
• Physiotherapy: Rarely needed. Spontaneous play is the best rehab.

Timeline:

• Week 0-4: Cast immobilization.
• Week 4-6: Return to walking.
• Week 6+: Full unrestricted activity (running, jumping).

The child does not require formal physical therapy in the vast majority of cases. Spontaneous play is sufficient for return to full function.

Surgery NOT Required

Toddler's fractures are almost universally treated non-operatively. Surgical intervention is not indicated for typical toddler's fracture. Cast immobilization for 3-4 weeks achieves 100% union.

Why no surgery? Non-displaced fracture, excellent pediatric healing, thick periosteum maintains alignment, no instability.

Referral Indications

Refer to pediatric orthopaedics if there is atypical presentation, concern for NAI, failure to improve with casting, other associated injuries, diagnostic uncertainty, or pathological fracture suspected.

Most cases are managed by ED or GP without orthopaedic referral as treatment is straightforward.

When to Consider Non-Accidental Injury

Red flags:

• Child is non-ambulatory (not yet walking)
• Spiral fracture in infant
• Inconsistent or changing history
• Delayed presentation
• Other injuries in different healing stages

Action: If NAI suspected, full skeletal survey, child protection referral, thorough documentation.

Limping Child Differential

A toddler's fracture is a diagnosis reached only after the dangerous mimics of the acutely limping or non-weight-bearing child have been considered. The single most important "cannot-miss" diagnosis is septic arthritis of the hip.

Rule of thumb: A febrile toddler who refuses to weight-bear is septic arthritis until proven otherwise - inflammatory markers and hip ultrasound take priority over assuming a fracture.