Improvised Splinting Techniques

A fracture is a break in a bone. Even if surgical repair is ultimately required, correct field immobilisation of a fracture dramatically reduces pain, prevents movement that causes further soft-tissue damage, reduces bleeding (bone ends can lacerate blood vessels and muscle), and makes transportation possible. An unimmobilised femur fracture, for example, can cause enough internal haemorrhage to produce haemorrhagic shock.

Improvised splinting is one of the most practically valuable wilderness and emergency first-aid skills — and one of the most underused, because people fear causing pain by manipulating a fractured limb. The principle of "splint it as it lies" removes that fear: you are not moving the fracture — you are building immobilisation around it.

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The Purpose of Splinting

A splint achieves four things:

1. Reduces pain — movement at a fracture site causes severe pain; immobilisation provides immediate relief
2. Prevents further injury — sharp bone ends can lacerate vessels, nerves, and muscle with movement
3. Reduces haemorrhage — immobilisation slows bleeding from bone ends and periosteal blood vessels
4. Enables transport — a well-splinted fracture can be transported with much less risk than an unsplinted one

Splinting is not definitive treatment — it is stabilisation pending definitive care. Every suspected fracture managed in the field still requires X-ray and medical assessment.

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The Golden Rule — Splint It as It Lies

Unless circulation below the fracture is compromised (absent pulse, white or blue extremity), do not attempt to straighten or realign a fracture. Move the splinting material to the limb, not the limb to the splint.

The exception: if the limb is cold, white, pulseless, or the patient reports numbness below the fracture, gentle anatomical traction to straighten the limb may restore circulation. This should only be attempted if evacuation to hospital will be significantly delayed and the limb is at risk. Apply traction gently and steadily — not a jerk — along the long axis of the bone, then splint in the corrected position.

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Improvised Splinting Materials

Commercial SAM splints are lightweight aluminium core wrapped in foam and can be moulded to any shape. They should be in every significant first-aid kit. When they are not available:

Material	Properties	Best For
Walking stick / trekking pole	Rigid, length-adjustable	Lower leg, forearm, upper arm
Rolled newspaper / magazine	Sufficient rigidity for small bones	Wrist, finger, forearm
Foam sleeping pad (cut)	Mouldable, padded, excellent	Any limb — excellent all-rounder
SAM splint (commercial)	Pre-formed aluminium, lightweight	Ideal; any limb
Cardboard (folded thick)	Reasonable for short-term	Wrist, ankle, forearm
Umbrella, straight branch	Rigid	Upper arm, lower leg
Rolled clothing	Limited rigidity — padding only	Supplementary — not sufficient alone

⚠️ The splint must be long enough to immobilise the joint above and below the fracture site. A mid-shaft tibia fracture requires the splint to span from above the knee to below the ankle.

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The CMS Check — Before and After Every Splint

Before applying a splint, and again after securing it, perform the CMS check:

C — Circulation

• Is there a pulse distal to (below) the injury?
• Check the radial pulse (wrist) for arm fractures, dorsal pedal pulse (top of foot) or posterior tibial pulse (behind ankle) for leg fractures
• Assess skin temperature and colour below the injury — warm and normal colour indicates intact circulation

M — Movement

• Can the patient move their fingers or toes below the fracture?
• Loss of movement suggests nerve or vessel involvement

S — Sensation

• Can the patient feel light touch to their fingers or toes?
• Numbness or "pins and needles" below the injury suggests nerve compression

Document (or remember) the pre-splint CMS findings. If any CMS parameter is absent or changes after splinting, loosen the splint immediately.

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Padding — Always, Without Exception

Every splint must include padding between the hard splint material and the skin. Bony prominences — the inside of the wrist, the ankle malleoli, the knee — are particularly vulnerable to pressure sores and nerve injury if hard material is applied directly.

Padding materials:

• Folded clothing
• Foam from a sleeping pad
• Rolled socks
• First-aid kit padding rolls
• Torn strips of shirt

The padding should extend the full length of the splint and be thick enough that you cannot feel the hard splint material by pressing through it.

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Securing the Splint — Firm, Not Tight

Secure the splint with bandages, torn clothing, or straps at a minimum of three points: just above the injury, just below the injury, and at the distal end (furthest from the body).

The securing material should be:

• Firm enough that the splint does not shift with gentle movement
• Not so tight that it causes numbness or tingling below the splint (indicating circulatory compromise)

After securing, immediately re-check CMS. If tingling or numbness develops, loosen the securing material — pressure on a nerve or blood vessel from the splint itself is a common error.

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Specific Splints

Upper Arm (Humerus)

1. Pad the axilla (armpit) with a large wad of material
2. Apply a rigid support along the outer aspect of the upper arm
3. Bind the arm to the chest with bandages or strips of clothing
4. Add an arm sling (triangular bandage) to take the weight of the forearm
5. Bind the arm gently to the side with a swathe (broad bandage around the whole chest and arm)

Forearm and Wrist

1. Fold a newspaper or magazine around a SAM splint into an 'L' shape — or use a rolled sleeping pad
2. Position under the forearm with the wrist in a neutral or very slightly extended position (the position of function)
3. Pad bony prominences
4. Secure at the elbow and wrist level
5. Apply a sling to elevate the forearm

Lower Leg (Tibia / Fibula)

1. Use two rigid supports — one on each side of the leg — or a single posterior (back of leg) SAM splint
2. The splint must extend from above the knee to below the heel
3. Pad generously around the ankle malleoli and the knee
4. Secure at the thigh, mid-calf, and foot/ankle level
5. The foot should be in a neutral position (at right angles to the leg)

Ankle

1. A SAM splint or folded sleeping pad in a 'U' shape cupped under the heel and up both sides of the ankle
2. Pad both malleoli
3. Secure below the knee, at mid-ankle, and at the foot
4. The ankle in neutral position
5. Do not apply traction — ankle fractures should be splinted as found

Finger

1. Buddy-tape to an adjacent finger (the simplest and most effective approach)
2. Or use a straight splint (pen, ice cream stick, small flat piece of wood) along the palmar surface of the finger
3. Tape proximal and distal to the injury — not directly over it
4. Do not hyperextend the finger during splinting

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Traction Splinting — Femur Fracture

A mid-shaft femur (thigh bone) fracture is a medical emergency. The thigh muscles are powerful — when the femur breaks, muscle spasm pulls the fracture ends in opposite directions, causing internal haemorrhage of 1–2 litres and extreme pain. Traction splinting applies gentle steady pull along the long axis of the leg, distracting the fracture slightly, reducing muscle spasm, and dramatically reducing pain and blood loss.

Commercial traction splints (Sager, Thomas, Kendrick) require training. In an extreme remote emergency without a commercial device:

1. Manual traction — one rescuer applies steady firm pull on the ankle while the patient is lying flat
2. Improvised traction — not reliably effective without specific training; manual traction is more controllable
3. Priority is evacuation — femur fractures require hospital treatment; traction splinting reduces pain and haemorrhage during transport

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Quick Reference

Key Principle	Detail
Splint as it lies	Do not straighten unless circulation is absent below injury
Joint immobilisation	Splint one joint above AND below the fracture
CMS check	Before and after — Circulation, Movement, Sensation
Padding	Always — full length of splint; extra at bony prominences
Securing tightness	Firm, not tight — loosen immediately if tingling develops
Finger fracture	Buddy-tape or palmar splint in position of function
Femur fracture	Traction splint to reduce muscle spasm and internal haemorrhage
Suspected open fracture	Cover wound before splinting — see open fracture guide
All field splinting	Temporary measure — medical evaluation still required