What to do
- 1Don't move the person unless you have to (they're in danger) — moving can worsen the injury.
- 2Stop any bleeding with firm pressure. For an open fracture, press around the wound — don't push the bone back in.
- 3Keep the injured area still. Don't try to realign the bone.
- 4Splint only if trained and help isn't quickly available: support above and below the break with something rigid (padded board, trekking pole, rolled sleeping pad), pad it, secure it snug but not tight enough to cut off circulation, and splint the limb in the position you found it.
- 5Apply a cold pack wrapped in cloth (never ice directly on skin) to limit swelling.
- 6Check circulation beyond the injury before and after splinting — a finger or toe that goes numb, pale, or bluish means loosen the splint and get help.
- 7Treat for shock — if the person feels faint or is breathing fast and shallow, lay them down and raise the legs if you can.
- 8Get medical care. Call 911 for the emergency signs; otherwise still get the fracture evaluated.
When to use it
- Falls on the trail, from heights, or during activities — the classic backcountry fracture.
- Immobilizing an arm or leg long enough to move a patient toward help or for EMS to arrive.
- Spotting when a "bad sprain" is a break (can't bear weight, obvious deformity) and treating it conservatively.
Common mistakes & safety
- Never realign a bone or push a protruding bone back. You can damage nerves, vessels, and tissue and worsen bleeding — cover an open fracture and control bleeding instead.
- A suspected neck, head, or back injury changes everything. Do NOT move the person; keep them still and call 911.
- Watch circulation past a splint. A splint tied too tight is its own emergency — numbness, pale/blue color, or no pulse beyond the injury means loosen it.
- Splint in the found position. Trying to straighten a deformed limb in the field can cause serious harm — that's a job for medical professionals.
- Don't put ice directly on skin — wrap the cold pack.
- Open fractures are an infection and bleeding emergency — they always need prompt professional care.
- When in doubt, treat it as broken. You can't reliably tell a fracture from a sprain in the field, so immobilize and get it checked.
Going deeper
- Why "above and below." Immobilizing the joints on either side of a broken bone stops the bone ends from moving, which controls pain and prevents further damage — the whole point of a splint.
- Improvised splints are standard. Trekking poles, tent stakes, a rolled sleeping pad, sticks, even a rolled newspaper — padded with clothing and tied with strips of cloth or bandanas.
- Sling and swathe. A sling supports the arm and a wrap around the body stops it swinging — the common way to immobilize an arm, wrist, or collarbone.
- Closed vs. open. Closed = skin intact; open (compound) = bone has broken the skin, adding bleeding and infection risk, and always needs urgent care.
Official source
Fractures (broken bones): first aid — Mayo Clinic →This is general first-aid information, not a substitute for hands-on training. Splinting is a skill best learned in a certified or wilderness first-aid course.