Paediatric Femur Fractures by Age

Paediatric femoral shaft fracture treatment is a classic age-based topic, but age is only the start. The final plan depends on age, weight, skeletal maturity, fracture pattern, length stability, soft tissues, associated injuries, mechanism, safeguarding concerns and the family’s ability to manage immobilisation and follow-up.

Younger children heal quickly and remodel well, but they also need careful assessment of whether the mechanism fits developmental ability. School-age children sit in the transition zone where spica casting may be burdensome and operative stabilisation is often attractive. Adolescents behave more like adults mechanically, but many still have open physes, so implant entry point and growth safety remain important.

The major pattern distinction is length-stable versus length-unstable. A transverse or short oblique fracture may be well suited to flexible intramedullary nails in an appropriately sized child. A long oblique, spiral, comminuted or segmental fracture is more likely to shorten and may need submuscular plating, external fixation or another stability strategy.

Outcome is not just radiographic union. A good result includes acceptable length, rotation, angulation, hip and knee motion, skin integrity, family functioning, safe return to activity and no missed safeguarding or polytrauma issue.

• Children heal femur fractures rapidly because of vascular bone and active periosteum.
• Overgrowth can occur after femoral shaft fracture, especially in younger children.
• Rotational deformity does not remodel reliably.
• Comminution and long oblique or spiral patterns can shorten under load.
• Flexible nails work best as load-sharing implants in length-stable patterns.
• Submuscular plating provides relative stability for length-unstable fractures.
• Rigid nails must avoid piriformis entry in skeletally immature children because of femoral head blood supply risk.
• External fixation is useful for open fractures, severe soft-tissue injury or damage-control situations.
• Spica casting controls length and angulation but creates skin, hygiene and family-care challenges. Pathological fractures through cysts or bone disease need diagnosis-specific planning.

History

The history should place the fracture in the context of the whole child.

• Mechanism: fall, twisting injury, road trauma, sport, high-energy crush or low-energy event.
• Developmental fit: walking status and whether the mechanism matches age and ability.
• Associated injury symptoms: head, chest, abdomen, pelvis, other limb, hip or knee pain.
• Bone health: previous fractures, bone pain, cyst, metabolic bone disease, malignancy or osteogenesis imperfecta features.
• Pre-hospital care: traction, splinting, analgesia, time since injury and transfer details.
• Family practicality: spica care, transport, toileting, skin checks, sleep, stairs and car seat issues.

Examination

Perform a paediatric trauma assessment before discussing implant choice. Inspect the thigh for swelling, deformity, shortening, external rotation, open wounds, bruising pattern and threatened skin. Check distal perfusion and document sciatic, peroneal and tibial nerve function where the child can cooperate.

Examine hip, knee, tibia and pelvis for associated injuries. High-energy femur fractures can coexist with femoral neck fracture, pelvic injury, floating knee, chest injury, abdominal injury or head injury. In children, pain behaviour, anxiety and increasing analgesia can be compartment warning signs even when the child cannot describe classic symptoms.

Rotation must be assessed clinically after reduction or fixation. Compare foot progression, thigh-foot profile and hip rotation. AP and lateral radiographs can look acceptable despite clinically meaningful malrotation.

• Always include hip and knee on femur imaging.
• Look for distal femoral physeal injury and femoral neck injury in high-energy trauma.
• A spiral femur fracture is not automatically abuse, but the mechanism must fit.
• Post-treatment X-rays should confirm length, angulation and implant position.
• Follow-up imaging checks union and maintenance of alignment.

• Femoral shaft fracture versus proximal femoral or distal femoral physeal fracture.
• Pathological fracture through unicameral bone cyst or non-ossifying fibroma.
• Non-accidental injury in non-ambulant or inconsistent mechanism.
• Osteogenesis imperfecta or metabolic bone fragility.
• Toddler tibial fracture mistaken for thigh pain.
• Hip dislocation or femoral neck fracture in high-energy trauma.

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Treatment is a ladder, not a single rule. Start with analgesia, splintage, skin and neurovascular care, and whole-child assessment. Then choose definitive treatment based on age, size, pattern and context.

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Early

• Compartment syndrome.
• Skin breakdown or cast problems.
• Loss of reduction or shortening.
• Open fracture infection.
• Associated injuries missed in polytrauma.

Late

• Malrotation.
• Limb length discrepancy from overgrowth or shortening.
• Knee stiffness after flexible nailing or immobilisation.
• Refracture after early implant removal.
• AVN risk with inappropriate rigid nail entry.

Age-based paediatric femoral shaft fracture treatment is a shortcut for a larger decision: age, weight, fracture stability, soft tissues, mechanism, family care capacity and associated injuries. The wrong operation for the wrong age or fracture pattern creates malunion, malrotation, skin problems or avoidable reoperation.

Rotation deserves special attention because it remodels poorly. Reduction and fixation should include clinical rotational assessment, not just acceptable AP and lateral radiographs. Family practicality also matters: spica care requires transport, toileting, skin monitoring, sleep planning and safe seating.

Complication review should include shortening, overgrowth, malrotation, angulation, nonunion, implant irritation, infection, refracture after implant removal, compartment syndrome and psychosocial burden.

• Start with the child age, not with your favourite implant.
• A femur fracture is a big injury in a child; look for other injuries.
• Spica is a treatment with a family workload, not just a cast.
• Flexible nails are not magic for length-unstable patterns.
• Submuscular plating is often the friend of comminution and heavier children.
• Rotation is the complication that X-rays can hide.
• Open fractures follow open-fracture principles first.
• Safeguarding review protects children and clinicians.
• Overgrowth can compensate shortening in some young children but should not be guessed casually.
• Follow-up should include gait and limb length, not union alone.

Common pitfalls

• Choosing treatment from age alone.
• Missing non-accidental injury.
• Ignoring femoral neck or knee associated injury.
• Using flexible nails for an unstable comminuted fracture without plan for shortening.
• Not checking rotation.
• Discharging a spica family without practical education.