Recognising a Potential Fracture
It can be difficult for a first aider to tell the difference between a fracture, a sprain, or a dislocation without an X-ray. If in doubt, it's always safest to treat the injury as a fracture. Key signs to look for include significant pain that worsens
with movement, visible swelling or bruising, and an obvious deformity or unnatural positioning of the limb. The person may also have been unable to bear weight on the limb or heard a snap or grinding sound at the time of the injury. Even if the person can still move the limb, a fracture is still possible.
The First Rule: Do No Harm
Before doing anything else, tell the injured person to stay as still as possible. The primary goal of fracture first aid is to prevent any further damage. Movement is the enemy of a broken bone. Never try to straighten a limb that looks bent or push a bone back in if it has broken through the skin, as this can cause severe complications. If there is any bleeding, apply firm pressure to the wound with a clean cloth or sterile bandage, pressing around the injury if bone is visible, not directly on it.
Why Immobilisation Is So Critical
Supporting, or immobilising, an injured limb is the most important thing you can do while waiting for medical help. When a bone breaks, its sharp fragments can shift and move. This movement can damage surrounding nerves, blood vessels, and muscles, turning a simple fracture into a complex injury. Keeping the limb still prevents this additional damage, helps control internal bleeding by allowing clots to form, reduces pain, and can lower the risk of shock. It effectively contains the injury, stopping it from getting worse during transport to a hospital.
How to Support the Injured Limb
The simplest way to support a limb is to leave it in the position you found it and use cushions, blankets, or rolled-up clothing to pad it on all sides, preventing movement. The person may be able to help support their own arm or leg. If medical help is far away and you are trained, you can apply a splint. A splint should be rigid—like a rolled-up magazine or piece of wood—and long enough to immobilise the joints above and below the break. Pad the splint well and secure it with bandages, but never directly over the fracture itself. Do not tie it so tightly that it cuts off circulation.
Checking Circulation and Getting Help
If you have applied a splint or bandages, you must check for circulation every 15 minutes. Look at the fingers or toes beyond the injury. If they become pale, cold, or numb, the bandages are too tight and must be loosened immediately. You can also check circulation by pressing on a fingernail or toenail; the colour should return within two seconds. While providing support, ensure that emergency medical services have been called. You should call for an ambulance if the person is in severe pain, the injury involves the head, neck, or back, there is heavy bleeding, or the limb appears deformed.
What You Should Absolutely Avoid
In a stressful situation, it's just as important to know what not to do. First and foremost, do not move the person unless they are in immediate danger. Never attempt to realign or 'pop' a joint back into place. Do not give the injured person anything to eat or drink, as they may require surgery. Finally, do not assume an injury is minor just because it doesn't look 'broken'. Only an X-ray can confirm a diagnosis, and providing proper support in the meantime is always the right call.
