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Buckle (Torodial) Fracture of the Distal Radius – A Patient‑Friendly Guide

Overview

A buckle fracture, also called a torus fracture, is a type of incomplete break in which one side of the bone bulges outward (like a buckle in a seat belt) while the opposite side remains intact. When this occurs in the distal radius—the end of the forearm bone nearest the wrist—it is the most common forearm fracture in children and the second‑most common pediatric fracture overall.

• Typical age group: 5–12 years (growing bones are more pliable, predisposing them to buckle fractures).
• Gender: Slight male predominance (≈55 % of cases) because boys tend to engage in higher‑impact play.
• Prevalence: In the United States, pediatric forearm fractures account for ~15 % of all emergency‑department visits; buckle fractures represent roughly 30‑40 % of those distal‑radius injuries<sup>1</sup>.

Symptoms

Because the fracture is incomplete, symptoms can be mild, but the injured wrist often looks and feels injured. Common presentations include:

• Pain at the wrist—usually localized to the distal radius; pain may increase with forearm rotation or gripping.
• Swelling—often visible within a few hours after injury.
• Bruising (ecchymosis)—may appear around the wrist or extend up the forearm.
• Limited motion—painful or reduced ability to bend (flex) and straighten (extend) the wrist.
• Tenderness to palpation—pressing on the distal radius elicits sharp discomfort.
• Visible “buckle” or deformity—sometimes a subtle outward bulge can be felt on the dorsal (back) side of the wrist.
• Crepitus—a faint crackling sensation when the wrist is moved, though this is less common.

Causes and Risk Factors

Mechanism of Injury

Buckle fractures typically result from a low‑energy, axial-loading force—for example:

• Falling onto an outstretched hand (FOOSH) while skating, biking, or playing on playground equipment.
• Direct impact to the forearm from a ball or a minor collision.

Why Children Are Prone

Young bones contain a thick, flexible outer layer (cortical bone) surrounding a softer, spongy interior (trabecular bone). This makes them more likely to bend and form a buckle rather than break cleanly.

Risk Factors

• Age 5‑12 years – growth plates are still open.
• High‑impact activities – gymnastics, skateboarding, basketball, and contact sports.
• Low bone mineral density – osteoporosis or chronic steroid use (rare in children but relevant in adolescents).
• Obesity – increased force on the forearm during a fall.
• Previous forearm fractures – may indicate underlying bone‑quality issues.

Diagnosis

Prompt evaluation in an urgent‑care or emergency department is essential to rule out more severe fractures.

Clinical Examination

• Inspection for swelling, bruising, and deformity.
• Palpation to locate maximal tenderness.
• Assessment of neurovascular status (checking sensation, pulse, and capillary refill in the fingers).

Imaging Studies

• Standard X‑ray (postero‑anterior and lateral views) – the gold standard. On the lateral view, a “buckle” appears as a localized bulge of the cortex without a clear break line.
• Ultrasound – increasingly used in pediatric settings to identify cortical buckling when radiation exposure is a concern.
• CT scan – rarely needed, reserved for atypical presentations or when an associated fracture is suspected.

Classification

According to the AO Pediatric Comprehensive Classification of Long Bones, a buckle fracture of the distal radius is coded as “33‑A3” (incomplete extra‑articular fracture). Knowing the classification helps guide treatment.

Treatment Options

Most buckle fractures heal rapidly because the bone remains stable. Treatment focuses on protecting the area while allowing painless motion.

Non‑Surgical Management

• Immobilization – a short arm cast or removable splint covering the wrist and part of the forearm is applied for 3–4 weeks. In children younger than 8 years, a removable splint may be sufficient and improves comfort.
• Pain control – acetaminophen or ibuprofen (dose according to weight) is usually adequate. Opioids are rarely needed.
• Activity modification – avoid weight‑bearing or sports that stress the wrist until the cast is removed.

When Surgery Is Considered

True buckle fractures rarely require surgery. However, if imaging reveals:

• Significant displacement (>2 mm) or angulation,
• Associated fracture of the distal ulna, or
• Open (compound) fracture,

closed reduction and percutaneous pinning or a short‑arm cast with a long-arm splint may be indicated. Surgical intervention is performed by an orthopedic hand surgeon.

Rehabilitation

• Early range‑of‑motion (ROM) exercises – once the cast is removed, gentle wrist flexion/extension, pronation, and supination exercises can begin.
• Hand therapy – a few sessions with a licensed hand therapist accelerate return to full strength.
• Strengthening – progressive resistance using a soft therapy ball after 4–6 weeks.

Living with a Buckle Fracture (Distal Radius)

Daily Management Tips

• Keep the cast dry – use a waterproof cover when showering; avoid submerging the cast.
• Elevate the arm above heart level for the first 48 hours to reduce swelling.
• Cold therapy – apply an ice pack (wrapped in a towel) for 15 minutes, 3–4 times daily during the first 72 hours.
• Monitor for skin problems – check for itching, foul odor, or discoloration, which can signal a cast‑related infection.
• Maintain nutrition – calcium‑rich foods (dairy, leafy greens) and vitamin D support bone healing.
• Follow-up appointments – typically a radiograph at 1‑week and again at cast removal to confirm healing.
• Return to school – most children can resume normal school activities within a week, avoiding heavy lifting or sports.

School and Sports Considerations

Inform teachers and coaches about the cast. Provide a written note from the treating physician outlining restrictions (e.g., no basketball for 4‑6 weeks). Once cleared, a gradual return‑to‑play protocol—starting with non‑impact activities and progressing to full participation—helps prevent re‑injury.

Prevention

• Use protective gear – wrist guards for skateboarding, rollerblading, and gymnastics.
• Supervise high‑risk play – ensure safe surfaces (soft mats, sand) and proper technique when learning new skills.
• Maintain healthy bone density – adequate calcium (1,000 mg/day for children 4–8 y; 1,300 mg/day for 9–18 y) and vitamin D (600–1,000 IU/day). Encourage outdoor activities for sunlight exposure.
• Address obesity – balanced diet and regular physical activity reduce impact forces during falls.
• Educate about “fall‑safe” techniques – teach children to land on their side or buttocks rather than outstretched hands when possible.

Complications

While buckling fractures typically heal without problems, potential complications include:

• Delayed union or non‑union – rare; may require prolonged immobilization or surgical intervention.
• Growth‑plate (physeal) disturbance – if the fracture extends close to the distal radial physis, it could affect future growth, leading to minor length discrepancy or angular deformity.
• Stiffness or loss of motion – prolonged casting >4 weeks can cause wrist stiffness; early controlled ROM helps prevent this.
• Cast‑related skin breakdown or infection – indicated by increased pain, foul odor, or fever.
• Complex regional pain syndrome (CRPS) – very uncommon in children but characterized by severe, burning pain and swelling after immobilization.

When to Seek Emergency Care

References

1. Mayo Clinic. “Distal radius fracture in children.” Updated 2023. https://www.mayoclinic.org
2. American Academy of Orthopaedic Surgeons. “Pediatric Fractures.” 2022. https://orthoinfo.aaos.org
3. Centers for Disease Control and Prevention. “Injury Data & Statistics.” 2021. https://www.cdc.gov
4. NIH National Institute of Arthritis and Musculoskeletal and Skin Diseases. “Bone Health in Children.” 2022. https://www.niams.nih.gov
5. Cleveland Clinic. “Buckle Fracture (Torus Fracture) of the Wrist.” 2023. https://my.clevelandclinic.org
6. World Health Organization. “Guidelines for the Management of Pediatric Fractures.” 2020. https://www.who.int

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