Toddler's Fracture

A toddler's fracture is a subtle spiral or oblique fracture of the tibial shaft in a young walking child, produced by a low-energy twist. It is a common paediatric fracture, and it often presents to the emergency department or the GP.

Who. Classically a walking child of 9 months to 3 years, and boys are slightly more often affected. The child must be ambulatory: a spiral tibial fracture needs a twisting force a baby who cannot walk should not be able to generate, so the pre-walking infant is the one who raises safeguarding concern.

The age ceiling is soft. The largest series of isolated accidental spiral tibial fractures cited on this page (Mellick) found a mean age of 50.7 months, over four years, with only 32.7% aged three or under and none under one year. Its authors argued that the injury is a spectrum across early childhood rather than a distinct toddler entity. Below walking age, think safeguarding; above three, still think toddler's fracture.

Mechanism. A low-energy twisting injury: running and stumbling, or a fall in the playground. The event is often unwitnessed, and the child cannot describe it.

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Where it breaks. The fracture typically lies in the distal third to middle third of the tibial diaphysis.

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Why toddlers. A child just learning to walk has an immature gait, wide-based and unsteady, and falls are common during play. The tibia is relatively weak compared with the forces generated. After the age of 3-4, gait matures and coordination improves.

Why a spiral. If the foot is fixed, on the ground or in a shoe, and the body rotates, a spiral force is transmitted to the tibia. Young bone is more porous and less mineralised and fails under torsional stress. The periosteum is thick in children and often remains intact, which limits displacement.

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Why it heals fast. The paediatric tibia has an excellent blood supply, and union is rapid, 3-4 weeks, compared with adults.

The classic pattern. A spiral or oblique fracture of the distal to mid tibial diaphysis, non-displaced or minimally displaced. It is often subtle or invisible on the initial X-ray, so look carefully for a faint spiral line or a cortical discontinuity. A transverse pattern means higher energy, and a high-energy mechanism makes the injury atypical.

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

• Cuboid, with a similar mechanism: the "cuboid toddler's fracture"
• Calcaneus, rare but reported
• Fibula: an isolated fibular fracture is less common but can occur

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History. The child is limping or refusing to walk, often with no witnessed injury. If anyone saw it happen, the mechanism was low-energy, with no significant trauma. Ask about developmental milestones, because the question that matters is whether the child is walking.

Examination. Point tenderness along the tibial shaft, with minimal or no swelling, no obvious deformity and a normal neurovascular status. The child refuses to bear weight.

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The 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. Before making it, assess the hip (septic joint, Perthes, transient synovitis), the knee (injury, infection), the foot (foreign body, injury) and the soft tissues (bruising, infection). The work-up may include inflammatory markers if infection is suspected.

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The single most important cannot-miss diagnosis in the limping toddler is septic arthritis of the hip, and the Kocher criteria are the classic decision rule the differential refers to. Know them by name and number.

How the count translates. The probability of septic arthritis rises steeply with the number of predictors met. In Kocher's original series it was roughly less than 1% with none, about 3% with one, about 40% with two, over 90% with three, and about 99% with all four; later validation cohorts gave somewhat lower figures. A raised CRP (over about 20 mg/L) is an additional strong predictor in modified versions.

What to do. A child meeting several criteria needs urgent hip ultrasound and joint aspiration, not a cast.

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Radiographs. AP and lateral views of the full length of the tibia and fibula, including the ankle and the knee. The fracture is often non-displaced with minimal periosteal reaction at first, so look for a subtle spiral line, cortical irregularity, or only soft-tissue swelling. When the AP and lateral are negative, an internal oblique view may reveal the spiral line, and it is often where the fracture is best seen.

Read every view. The lateral is often negative, but it can be the one projection that shows the fracture.

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The negative film. The initial X-ray is negative in 50%, and a negative X-ray does not rule out a toddler's fracture.

The repeat film. A repeat X-ray at 2 weeks is the most reliable next test: periosteal reaction and early callus confirm the fracture. In practice most cases are treated clinically, and if the child is improving at 2 weeks the diagnosis is confirmed.

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Bone scan and MRI. Only if the diagnosis is uncertain and the child is not improving. A bone scan is very sensitive but involves radiation and is rarely needed. MRI can show bone marrow oedema and the fracture line and is reserved for atypical cases.

Treat on suspicion. Do not wait for a positive X-ray. If clinical suspicion is high (a limping walking-age toddler, tibial tenderness, a low-energy mechanism), apply a cast: the child will improve, and the follow-up X-ray confirms the diagnosis.

Algorithm

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The cast. An above-knee cast (AKC) and a below-knee cast (BKC) are both acceptable. The above-knee cast controls rotation better and is well tolerated, because toddlers adapt quickly; the below-knee cast is lighter and allows knee motion. The cast stays on for 3-4 weeks, as healing is rapid at this age.

Alternatives. A CAM boot can be used in cooperative older toddlers, though compliance is less reliable. A very minimally symptomatic child may be observed, but a cast is generally preferred for comfort and to allow mobilisation, and most practitioners prefer it because it is simple, well tolerated and definitive. That preference is now contested by a randomised trial favouring the removable boot and by a cohort managed without immobilisation; both are set out under Controversies below.

Cast care. Parental education is crucial to successful management:

• A plaster cast must stay dry. Fibreglass with a waterproof liner can get wet if specified, but standard wool padding must be kept dry.
• Check the skin at the cast edges for redness or rubbing, and put nothing down the cast to scratch, because of the risk of infection.
• Check the toes are pink, warm and moving; cold, blue or swollen toes need medical attention.
• The child can crawl or scoot. Walking on a reinforced walking cast is generally allowed, though some prefer non-weight-bearing for the first week for pain control.
• Return for uncontrolled pain, fever, a bad smell from the cast, or a cast that becomes loose or tight.

What to tell the parents. "We suspect a minor fracture that may not show on today's X-ray. We will treat with a cast for 3-4 weeks. A repeat X-ray will confirm healing. Your child will be walking normally again soon."

Surgery is not required. Toddler's fractures are almost universally treated non-operatively, and surgery is not indicated for the typical fracture. It is non-displaced, paediatric healing is excellent, the thick periosteum maintains alignment and there is no instability.

Referral. Most cases are managed by the emergency department or GP without orthopaedic referral, as treatment is straightforward. Refer to paediatric orthopaedics for:

• An atypical presentation
• Concern for non-accidental injury
• Failure to improve with casting
• Other associated injuries
• Diagnostic uncertainty
• A suspected pathological fracture

Prognosis. Excellent. Union is virtually 100% and nonunion essentially does not occur. Remodelling is not needed, since the fracture is usually non-displaced, and the child makes a complete return to normal gait and activity within weeks, with no long-term sequelae.

The question is mobility. A spiral tibial fracture in a non-ambulatory child, one not yet walking, raises suspicion for non-accidental injury. Document developmental milestones carefully. Consider abuse when the picture is atypical:

• The child is non-ambulatory, or a spiral fracture is found in an infant
• The history is inconsistent or changing, or the explanation does not match the injury
• A developmental mismatch: the injury is impossible for the child's age
• Delayed presentation
• Other injuries in different stages of healing, or multiple fractures
• Rib fractures, or a metaphyseal (bucket-handle) fracture

Action. If non-accidental injury is suspected, obtain a full skeletal survey, refer to child protection and document thoroughly.

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The red flags above include the "bucket-handle" fracture, and the viva below asks about it. The examiner expects you to know what it is and where the spiral tibial fracture sits on the abuse-specificity scale.

What it is. The classic metaphyseal lesion (CML) is a planar fracture through the immature metaphysis (the primary spongiosa), running roughly parallel to the physis. Its radiographic name depends on the projection:

• Seen tangentially, it looks like a small triangular "corner" fracture
• Seen en face or obliquely, the same lesion looks like a crescentic disc, the "bucket-handle" appearance

Why it matters. It is produced by shearing and traction-torsion forces (pulling, twisting or shaking a limb) and is highly specific for inflicted (non-accidental) injury, classically at the distal femur, the proximal and distal tibia, and the proximal humerus.

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The limit of the word "specific". The association is real and strong, and it is what should raise the alarm - yet it has never been quantified. Kemp's systematic review (BMJ 2008, PMID 18832412) was able to compute a probability of abuse for rib (0.71), humerus, femur and skull fractures, but found insufficient comparative studies to calculate one for the classic metaphyseal lesion at all, and its conclusion applies to every pattern on this page: no fracture, on its own, distinguishes an abusive from a non-abusive cause. In an exam, in a report and in court, "highly suggestive of inflicted injury, and requiring full safeguarding assessment" is defensible; "diagnostic of abuse" is not. The CML earns its place by prompting the assessment, not by concluding it.

Mimics. Normal metaphyseal variants can look like a CML, and telling them apart is a job for both projections, the distribution of the findings and an experienced paediatric radiologist.

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After the cast. Stiffness is minimal in toddlers and usually resolves spontaneously within days. The child may limp for 1-2 weeks out of habit or mild stiffness, which is normal.

Rehabilitation. Formal physiotherapy is rarely needed. Spontaneous play is the best rehabilitation and is sufficient for a return to full function in the vast majority of cases.

Is the routine film needed? The protocol above includes a film at 2-3 weeks, but some pathways discharge with safety-netting alone; that debate is set out under Controversies.

Immobilise the radiograph-negative limp? The longstanding teaching is to cast every clinically suspected toddler's fracture. Newer data (Coveney 2024) show that selected presumptive cases do as well without immobilisation. There is no consensus, and practice varies widely.

Cast, CAM boot or back-slab? A randomised trial (Bradman 2021) found a removable CAM boot gave easier care and faster weight-bearing with equal healing. Many still default to an above-knee cast for the unreliable toddler, and the best device remains debated.

Is routine follow-up needed? Some pathways discharge with safety-netting only; others mandate a 2-week clinic film to "confirm" a clinically obvious diagnosis. In the typical case, repeat imaging mainly adds reassurance and exposure, not a change in management.

Terminology and age limits. Mellick's CAST (childhood accidental spiral tibial) fracture work argues that the rigid "9 months to 3 years" definition is artificial, because accidental spiral tibial fractures occur across early childhood. The classic age band is a teaching aid, not a strict diagnostic gate.