A fracture is a break in the structural continuity of a bone, along with some degree of injury to the surrounding soft tissue. Despite what many people assume, “fracture” and “broken bone” mean exactly the same thing. There is no medical distinction between the two terms, and doctors use them interchangeably.
How Bones Break
Bones are strong but not indestructible. They fail when the force applied to them exceeds their ability to absorb it. That force can come from a single high-energy event, like a fall or car accident, or from repetitive low-level stress over time. The direction and intensity of the force determine the pattern of the break, which is why fractures look very different depending on how they happen.
A direct blow tends to break the bone straight across (a transverse fracture), while a twisting injury spirals the break along the length of the bone. When enough energy is involved, the bone can shatter into three or more pieces, known as a comminuted fracture. An angled break, called an oblique fracture, falls somewhere in between.
Open vs. Closed Fractures
The most important initial distinction is whether the fracture is open or closed. In a closed fracture, the skin stays intact. In an open fracture (sometimes called a compound fracture), the broken bone or the blood pooling around it is exposed to the outside through a wound in the skin. That wound doesn’t have to sit directly over the break to count. Any fracture with a nearby skin wound is treated as open until proven otherwise.
Open fractures carry a significant infection risk. When skin tears near a break, it creates a vacuum effect that pulls dirt and debris deep into the wound, sometimes reaching the bone itself. Timing matters enormously here: one study found that when antibiotics were given within about an hour of injury, the infection rate was 0%, but it jumped to 17% when treatment was delayed. This is why open fractures are always treated as emergencies.
Stress Fractures
Not all fractures come from a single traumatic event. Stress fractures develop gradually from repetitive force, the kind that comes from running, marching, or jumping. Rather than a clean break, a stress fracture is a tiny crack that worsens over time if the activity continues. They’re common in the feet, shins, and lower legs.
One frustrating feature of stress fractures is that they often don’t show up on regular X-rays taken in the first few weeks after pain begins. It can take weeks for the bone damage to become visible on an X-ray. MRI is considered the best tool for finding them early, since it can detect changes in bone and surrounding tissue before the crack is large enough to appear on standard imaging.
Why Children’s Fractures Are Different
Children’s bones are more flexible than adult bones because they contain a higher ratio of collagen, the protein that gives bone its elasticity. They also have a thicker, stronger outer lining (periosteum) that acts almost like a sleeve holding the bone together. These qualities mean that children’s bones tend to bend and bow under forces that would snap an adult bone cleanly in two.
This flexibility produces fracture patterns unique to kids. A greenstick fracture breaks through only one side of the bone while the other side bends, much like snapping a fresh twig. A torus (or buckle) fracture compresses one side of the bone without breaking all the way through. These partial breaks are generally more stable and heal faster than complete fractures, partly because that thick periosteum limits how far the broken ends can shift apart.
How Bones Heal
Bone is one of the few tissues in the body that can regenerate rather than just scar over. Healing happens in three overlapping phases.
The inflammatory phase begins within hours of the break. The area becomes red, swollen, and painful. Broken blood vessels form a clot that appears as a bruise. This clot becomes the foundation for new bone, so it’s a productive part of the process even though it feels like the worst part.
During the reparative phase, which unfolds over days to weeks, the blood clot transforms into a soft callus made of cartilage and fibrous tissue. This soft callus provides some stability but isn’t strong. Over several more weeks, it hardens into a bony callus that’s sturdy enough for the area to start bearing some use, though it’s still weaker than normal bone.
The remodeling phase takes months to years. During this time, the hard callus gradually reshapes itself into mature bone that matches the original structure. This is why a healed fracture can eventually become nearly as strong as before, and why doctors will say the bone is “healed” long before the remodeling process is truly finished.
How well a fracture heals depends heavily on how stable the break site is. When there’s very little movement between the broken ends (less than 2% strain), the bone can heal directly across the gap. With moderate movement (2 to 10% strain), the bone heals indirectly through the callus process described above. Too much movement, above 10%, can prevent healing altogether.
Recovery Timelines
Healing time varies widely depending on which bone is broken, the severity of the fracture, your age, and your overall health. As a rough guide, smaller bones like those in the wrist or hand may heal in six to eight weeks, while a major weight-bearing bone like the thighbone can take three to six months. Children’s fractures typically heal faster than adults’ because of their more active bone-forming cells and better blood supply.
Smoking, diabetes, poor nutrition, and certain medications can slow healing significantly. So can inadequate immobilization. If the broken ends aren’t held still enough during recovery, the bone may struggle to bridge the gap.
Treatment Approaches
Most fractures that are well-aligned and stable heal with immobilization alone: a cast, splint, or brace that holds the bone in position while the body does the repair work. You’ll typically wear the cast for several weeks, and your doctor will take periodic X-rays to check that the bone is healing in the right position.
Fractures that are displaced (the broken ends have shifted out of alignment) or unstable often need to be realigned and held in place with hardware. This can mean metal plates and screws placed directly on the bone during surgery, or an external frame with pins that pass through the skin into the bone on either side of the break. The goal of external fixation is to maintain the length, alignment, and rotation of the fracture, and it can serve as either a temporary measure or a permanent solution depending on the injury.
When Healing Goes Wrong
Most fractures heal without complications, but two problems are worth knowing about. A malunion occurs when the bone heals in a crooked, twisted, or shortened position. You might notice that the bone looks visibly bent, or you may develop pain, limping, or weakness when using it. Because your skeleton works as a connected system, a misaligned bone can put extra stress on nearby joints and cause pain in areas that seem unrelated to the original injury. In some cases, misaligned bone can press on or trap a nerve, causing numbness, tingling, or muscle weakness.
A nonunion occurs when the bone stops trying to heal altogether. Signs include deep, chronic pain at the fracture site, lasting weakness, and sometimes a visible bump or gap. Your doctor may diagnose nonunion if the bone hasn’t healed after six to twelve months, depending on the fracture. Some nonunions show evidence of new bone growth that simply hasn’t connected (suggesting the bone wasn’t held still enough during recovery), while others show no growth at all (suggesting a biological problem like poor blood supply). Both malunion and nonunion typically require additional treatment, which may include surgery to realign or re-stimulate healing.