End the hike once an arm needs support. Remove the injured person’s backpack before applying a sling, since shoulder straps and pack weight can pull on the injury. Have another hiker carry their water, warm layer, food, navigation, and communication gear.
Stop and Look for Emergency Signs
Call 911, contact local rescue, or use a satellite communicator when the injured person has any of these signs:
- Bone visible through the skin
- Heavy bleeding that does not stop with firm direct pressure
- An arm, wrist, elbow, or shoulder that looks bent, shortened, or out of place
- Fingers that are cold, pale, blue, numb, weak, or difficult to move
- Severe pain after a fall or inability to use the arm
- Head injury, neck pain, confusion, fainting, or repeated vomiting
- Chest pain, trouble breathing, or back pain after a fall
Move only if staying where you are creates a more immediate danger, such as lightning exposure, rising water, falling rocks, or an unsafe trail edge.
Choose the Right Kind of Support
Use the simplest support that keeps the arm comfortable without forcing it into a new position.
| Trailside situation | Support to use | What to do |
|---|---|---|
| Mild shoulder or upper-arm pain; forearm rests comfortably across the chest | Arm sling | Support the forearm with the hand slightly higher than the elbow. |
| Suspected wrist or forearm fracture, swelling, or severe pain | Padded rigid splint plus sling | Splint first to limit movement at the injury, then use the sling to carry the arm’s weight. |
| Elbow cannot bend, or bending sharply increases pain | Soft support in the position found | Use folded clothing or jackets to cushion the arm without forcing a bend. Arrange urgent help. |
| Hand is cold, numb, weak, pale, or blue | Avoid tight wrapping | Loosen anything restrictive and seek emergency help. |
A sling does not need to look neat. It needs to hold the arm still enough to prevent swinging, keep the fingertips visible, and avoid placing a knot against the throat or spine.
Make a Sling With a Triangular Bandage
A triangular bandage is easy to carry and works well for an arm sling. If one is not available, use a clean, broad piece of cloth such as a shirt, jacket, bandana, buff, or scarf. Avoid narrow cord, shoelaces, and thin straps against the neck.
- Get the person stable. Sit or stand them where they will not lose balance. Support the injured arm while preparing the sling. Do not ask them to lift the arm or demonstrate its range of motion.
- Bring the forearm across the chest. Bend the elbow near 90 degrees only when that position is comfortable. If bending hurts badly, support the arm where it naturally rests instead.
- Slide the bandage under the forearm. Place the long edge beneath the arm and aim the triangle’s point toward the elbow.
- Lift the two long ends around the neck. Tie them at the side of the neck rather than directly behind it. A side knot is less likely to press into the neck during the walk out.
- Secure the loose point near the elbow. Fold it or secure it so the elbow and forearm cannot slide out of the sling.
- Keep the fingertips outside the fabric. Visible fingers make it easier to notice circulation changes.
- Look at the hand again. The fingers should remain warm, with normal feeling and movement. Loosen and retie the sling if they become cold, pale, blue, numb, or tingly.
If the knot rubs, pad it with a folded shirt, hat, or other soft layer. The sling should support the arm without pulling the shoulder upward or putting strain on the neck.
Add a Splint When the Forearm or Wrist May Be Broken
A sling carries the arm’s weight. It does not stop movement at a painful wrist or forearm injury. When a fracture is suspected, place padded support along the injured area first, then use a sling.
Use a rigid item that can be padded with clothing, gauze, or other soft material. Keep the arm in the position found rather than straightening it. Secure the splint gently enough that the hand remains warm and the fingers can move. Then place the splinted arm in the sling.
Do not try to push a bone, wrist, elbow, or shoulder back into place. Do not straighten an arm that is bent at an unusual angle.
Keep the Sling Supportive, Not Tight
A sling should reduce arm swing without squeezing the hand, shoulder, chest, or neck. An overly loose sling lets the arm bounce on downhill steps. An overly tight sling can increase pain and interfere with circulation.
During the exit, look at and ask about the fingers regularly. Compare the injured hand with the uninjured hand. Loosen the sling and seek help if the injured hand develops changes in color, temperature, sensation, movement, or swelling.
A second triangular bandage or wide strip of cloth can gently hold the arm against the chest. This may help prevent swinging on an easy walk out. Do not wrap the chest tightly or make breathing difficult.
Decide Whether to Walk Out or Wait for Help
A sling reduces the ability to protect against a fall. An injured hiker may have trouble using trekking poles, grabbing a handrail, steadying themselves on loose rock, or catching themselves during a slip.
A slow walk out with a companion may be reasonable when pain is mild, the hand remains warm and functional, the person is alert and steady, and the route back is short and uncomplicated. Choose the easiest way out, slow down on descents, and avoid any section that requires both hands for balance.
Be more conservative when the route includes:
- Loose rock, wet roots, mud, snow, stream crossings, or steep downhill travel
- Scrambling, ladders, cables, handrails, or narrow trail edges
- A long distance to the trailhead or poor communication coverage
- Cold rain, strong wind, high heat, or approaching thunderstorms
- A person who is dizzy, weak, chilled, dehydrated, or unable to walk steadily
- Children or other group members who need close supervision
Wait for rescue or arrange urgent evaluation when pain is severe or worsening, a fracture is suspected, the terrain makes a fall likely, or the person needs major assistance to move safely.
When communication is available, send the injury, trail name, location, direction of travel, group size, weather, and supplies on hand. Preserve phone battery when there is no signal by using airplane mode.
When Not to Use a Standard Across-the-Chest Sling
Skip the usual sling when the arm cannot rest comfortably across the chest. Support it in the position found with jackets, folded clothing, foam, or other soft material while arranging help.
Do not force an across-the-chest sling for:
- A suspected shoulder dislocation with the arm held away from the body
- An elbow injury that cannot bend without severe pain
- An open fracture or deep wound
- A neck, spine, or head injury after a fall
- Rapidly increasing swelling
- Loss of circulation or sensation in the hand
- A person who is alone, confused, or unable to walk safely
Children need the same hand and finger checks as adults. They may not clearly describe numbness or tingling, so watch for finger color changes, refusal to move the fingers, crying that increases after the sling is tied, or fabric slipping toward the neck.
What to Carry for Sling and Splint Support
Keep sling materials with the rest of the first-aid supplies, where another member of the group can reach them. A useful day-hike kit can include:
- Two triangular bandages or clean cloths
- Nitrile gloves
- Gauze pads, roller bandage, and medical tape
- Trauma shears
- A compact splint or flexible padded item for splinting
- An emergency blanket or warm layer
- Water and easy food
- A charged phone, offline map, whistle, and backup communication plan
Spread essential safety gear between packs before leaving the trailhead. If the person carrying the first-aid kit injures an arm, someone else should still have access to navigation, warmth, water, and communication.
After an incident, replace used gloves, gauze, tape, and damaged sling material. Wash reusable cloth that contacted sweat, dirt, or blood, and dry it fully before packing it again. Keep blood-soiled fabric away from food, water bottles, and clean bandages.
Common Sling Mistakes
Avoid these errors:
- Forcing the elbow into a 90-degree bend
- Covering the fingertips with fabric
- Tying the knot behind the neck
- Leaving a loaded backpack on the injured person
- Using narrow cord or thin straps against the neck
- Skipping hand and finger checks after tying the sling
- Continuing toward the planned destination instead of exiting
- Choosing steep shortcuts or terrain that needs two hands for balance
- Leaving the injured hiker without warmth, navigation, or communication
Keep a companion close to the injured person, use shorter steps on descents, and take breaks before they become shaky or chilled. The goal is not to finish the route; it is to support the injury and get out without creating a more serious emergency.
Bottom Line
Use a sling to support an injured arm in a comfortable position, with the fingertips exposed and the knot at the side of the neck. For a suspected wrist or forearm fracture, use a padded splint first and a sling second.
End the hike, reduce pack weight, choose the safest exit, and call for help when the injury, terrain, weather, or changes in the hand make walking out unsafe.