A buckle fracture is an incomplete break in a bone where one side crumples or bulges outward under compression, rather than snapping all the way through. It’s also called a torus fracture or impacted fracture. These fractures happen almost exclusively in children, and they’re one of the most common childhood injuries: distal radius buckle fractures alone account for 27.2% of all pediatric fractures, making them the single most frequent broken bone in kids.
Why Children Get Buckle Fractures
Children’s bones are softer and more porous than adult bones. They contain more cartilage and are still actively growing, which makes them more flexible. When an adult falls and catches themselves with an outstretched hand, the force often snaps the bone cleanly in two. When a child does the same thing, that flexibility allows the bone to compress and buckle on one side instead of breaking all the way through. Think of it like pushing down on a cardboard tube: the sides crumple and bulge rather than cracking apart.
This is why buckle fractures are a childhood injury. As bones mature and harden through adolescence, they lose the flexibility that allows this type of incomplete break. Adults who fall with the same force are far more likely to sustain a complete fracture.
Where Buckle Fractures Happen
The wrist is by far the most common location. Half of all pediatric wrist fractures are buckle fractures, typically occurring in the distal radius (the forearm bone near the wrist) at the spot where the wider end of the bone meets the narrower shaft. This is a natural weak point where compression forces concentrate during a fall.
Buckle fractures can also occur in other long bones:
- Femur (thigh bone)
- Tibia (shin bone)
- Fibula (calf bone)
- Humerus (upper arm bone)
They don’t typically affect small bones in the hands, fingers, or thumbs. In rare cases, buckle fractures can occur in flat bones like the ribs.
Symptoms to Recognize
Buckle fractures are easy to underestimate because there’s no visible deformity. The bone hasn’t shifted out of place, so the arm or leg looks normal. What you’ll typically notice is localized pain right at the site of the fracture, swelling in the surrounding area, and tenderness when you touch or press on the spot. Your child may resist moving the affected limb, particularly bending or rotating the wrist if that’s where the injury is.
Because the symptoms can look a lot like a bad sprain, an X-ray is the only reliable way to confirm the diagnosis. On imaging, a buckle fracture shows up as a subtle outward bulge on one side of the bone’s outer surface. The bone isn’t displaced or separated, and it may have slight angulation but nothing dramatic. Radiologists describe it as a compression failure at the junction between the wider and narrower parts of the bone.
Treatment: Splint or Cast
Buckle fractures are considered stable injuries. The bone hasn’t broken through, and it isn’t going to shift out of alignment during healing. This means treatment is straightforward: immobilize the area and let it heal.
The traditional approach was a plaster cast for several weeks, but clinical evidence now favors removable splints for most buckle fractures. A literature review comparing the two found that splinting produced outcomes just as good as casting, with all fractures healing without any change in bone alignment regardless of which method was used. Children significantly preferred removable splints, and the approach was more cost-effective. The one caveat is that very young children or children who may not keep a removable splint on reliably might still do better with a cast.
Most buckle fractures heal within three to four weeks. Children’s bones remodel quickly, and because the fracture is stable from the start, the recovery is typically uncomplicated. Pain usually subsides within the first week or two, and normal activity can resume gradually once the immobilization period ends.
Follow-Up and Long-Term Outlook
One of the most reassuring aspects of buckle fractures is that they don’t require much medical follow-up. A study reviewing 106 pediatric buckle fracture cases found that none of the fractures displaced further over time, regardless of treatment. The conclusion was clear: buckle fractures don’t need follow-up X-rays. A single visit to confirm the diagnosis and apply a splint is often sufficient.
Long-term complications are rare. Because the bone doesn’t break completely through, the growth plates near the ends of children’s bones are typically not involved. This means buckle fractures don’t carry the same risk of growth disturbance that more severe fractures near the growth plate can pose. The bone heals, remodels, and returns to full strength. Most children have no lasting effects and can return to sports and physical activity within a few weeks of the splint coming off.