Proximal Femur Fractures

Modern Study Review (AI-Generated)

High-Yield Summary

Proximal femur fractures in pediatric patients are rare but carry significant risk of complications such as avascular necrosis (AVN) and growth disturbances. Early anatomic reduction and stable fixation are critical to optimize outcomes and minimize long-term deformities. Modern management emphasizes operative fixation with capsulotomy to reduce intracapsular pressure and improve femoral head perfusion. Hip dislocations require urgent reduction and imaging to prevent cartilage damage and ensure joint congruity.

Key Diagnostic Findings

Anatomy

The proximal femur in children includes the epiphysis, physis, and metaphysis, with a vulnerable blood supply primarily from the medial femoral circumflex artery.
The physis is a critical growth center; injury can lead to growth arrest and deformity.

Clinical Presentation

Pain, inability to bear weight, and deformity of the hip or thigh.
In hip dislocation, limb may present shortened and internally or externally rotated depending on dislocation type.

Imaging

X-rays: Anteroposterior (AP) pelvis and lateral hip views to classify fracture and assess displacement.
CT scan: Post-reduction to confirm joint congruity and detect intra-articular fragments, especially in hip dislocations.

Classification Systems

Classification	Description	AVN Risk (%)	Notes
Delbet Classification (1907)	Pediatric proximal femur fractures		Still referenced but supplemented by newer systems
Type I (Transepiphyseal)	Fracture through the epiphysis	~100%	Highest AVN risk, often with physeal injury
Type II (Transcervical)	Fracture through the femoral neck	50-60%	High AVN risk, requires urgent fixation
Type III (Basicervical)	Fracture at the base of the femoral neck	30-40%	Lower AVN risk but still significant
Type IV (Intertrochanteric)	Fracture through the intertrochanteric region	Low	Lowest AVN risk, better prognosis

– Note: Modern classifications incorporate MRI and CT findings for better vascular assessment.

Current Gold Standard Treatment

Non-operative

Limited role in proximal femur fractures due to high risk of complications.
Reserved for non-displaced fractures or patients unfit for surgery.
Hip spica casting is largely obsolete except in very young children with stable fractures.

Operative

Indications: Displaced fractures, all Delbet types except some Type IV, and hip dislocations.
Procedure:
Early anatomic reduction with gentle manipulation.
Capsulotomy to decompress intracapsular hematoma and reduce AVN risk.
Stable internal fixation with pediatric-specific implants (e.g., cannulated screws, pediatric DHS).
Hip dislocations require urgent closed reduction under general anesthesia; open reduction via Kocher-Langenbeck approach if irreducible or buttonholed femoral head.
Postoperative care: Early mobilization as tolerated, serial imaging to monitor healing and growth.

Modern Complications & Outcomes

Complications

Complication	Description & Clinical Relevance
Avascular Necrosis (AVN)	Most feared complication, especially in Type I and II fractures; leads to femoral head collapse and arthritis.
Physeal Arrest	Can cause coxa breva (short femoral neck), greater trochanter overgrowth, and limb length discrepancy (LLD).
Coxa Vara Deformity	Malunion with varus angulation due to poor reduction; leads to altered biomechanics and gait abnormalities.
Nonunion	Rare but may require valgus subtrochanteric osteotomy for salvage.
Post-traumatic Arthritis	Late sequelae of AVN or incongruent reduction.

Outcomes

Early anatomic reduction and fixation with capsulotomy significantly reduce AVN rates and improve functional outcomes.
Long-term follow-up is essential to monitor growth disturbances and intervene early if deformities develop.
Hip dislocations treated promptly have good prognosis; delayed reduction increases risk of AVN and cartilage damage.

Classic Clinical Notes