Suture Technique

Part of First Aid

Suturing — sewing a wound shut with needle and thread — is the most reliable method of wound closure available without modern medical infrastructure. It requires practice, steady hands, and respect for the damage you can cause if done incorrectly.

Improvised Suture Materials

You will not have a pre-packaged suture kit. Here is what works and what does not.

Needles

Needle Type	Suitability	Preparation
Sewing needle (curved)	Best improvised option	Sterilize by holding in flame until red-hot, then cool in alcohol or clean water
Sewing needle (straight)	Usable but harder to work with	Same sterilization; bend slightly with pliers to create a curve if possible
Safety pin	Usable for very small wounds	Open, sterilize, use the pointed end
Fish hook (barb filed off)	Good curve, strong	File off the barb completely; sterilize
Thorn (hawthorn, acacia)	Desperation only	Naturally curved, but fragile and nearly impossible to sterilize
Bone needle (hand-carved)	Historical precedent	Carve from dense bone, sand smooth, create an eye hole with a heated wire

The ideal improvised needle is a medium sewing needle (3-5 cm long) bent into a gentle C-curve with pliers. The curve allows you to enter and exit the skin in a scooping motion rather than pushing straight through.

Thread / Suture Material

Material	Strength	Absorption	Notes
Fishing line (monofilament, 2-6 lb test)	Excellent	None (must be removed)	Best improvised option. Smooth, strong, low infection risk
Dental floss (unwaxed)	Good	None	Readily available; slightly abrasive
Silk thread	Good	Very slow	Natural material; wicks bacteria along the strand
Cotton thread	Moderate	Slow	Weakens when wet; double or triple for strength
Thin gut / sinew	Good	Yes (weeks)	Traditional surgical material; soak to soften before use
Hair (human or horse)	Weak	None	Historical emergency suture; only for very low-tension wounds
Nylon thread	Good	None	Synthetic; low bacterial wicking

Best choice: Monofilament fishing line, 4-6 lb test weight. It is strong, smooth (less tissue damage during passage), non-absorbent (does not wick bacteria), and widely available in a survival scenario.

Warning

Sterilize everything. Boil needle and thread for 10 minutes, or soak in alcohol (at least 60% concentration) for 30 minutes. Flame-sterilize the needle until it glows red. Introducing dirty materials into a wound is worse than leaving the wound open.

Before You Begin

Review the closure decision from Wound Closure. Suturing a contaminated or infected wound traps bacteria inside and can be fatal.

Pre-suture checklist:

1. Wound is clean (irrigated with 500+ ml of clean water under pressure)
2. Wound is less than 6-8 hours old, OR you are performing delayed primary closure after 3-5 days of clean observation
3. No signs of infection
4. Bleeding is controlled (minor oozing is acceptable)
5. Needle and thread are sterilized
6. You have clean hands
7. You have adequate light to see what you are doing
8. The patient understands what is about to happen

Basic Suturing Technique: Simple Interrupted

The simple interrupted stitch is the foundation of wound closure. Master this before attempting anything else. For stitch pattern variations, see Stitch Patterns.

Positioning

• Position yourself so the wound runs left-to-right in front of you (for right-handed people; reverse for left-handed).
• Hold the needle in your dominant hand, grasping it about two-thirds back from the tip with your fingers or improvised needle holder (pliers with cloth-wrapped jaws, hemostats if scavenged).
• Hold the thread tail with your non-dominant hand.

The Stitch

Step 1 — Enter the skin on one side of the wound, 3-5 mm back from the wound edge. Push the needle through the skin at a 90-degree angle to the surface. The entry should be perpendicular, not angled.

Step 2 — Scoop the needle through the tissue in an arc following the needle’s curve. The deepest point of the arc should be deeper than the wound itself. This ensures the stitch captures enough tissue for strength and pulls the deep layers together, not just the skin surface.

Step 3 — Exit the skin on the opposite side of the wound, the same distance from the edge (3-5 mm). The entry and exit points should be mirror images of each other.

Step 4 — Pull the thread through, leaving a 3-4 cm tail on the entry side.

Step 5 — Tie the knot. Use a surgeon’s knot (double-throw first, single-throw second, single-throw third):

• Wrap the thread around the needle holder (or your finger) twice, grab the short tail, and pull through — this is the double-throw that locks in place.
• Wrap once in the opposite direction, pull through — this is the first securing throw.
• Wrap once more in the original direction, pull through — this is the final lock.

Step 6 — Tighten the knot just enough to bring the wound edges together so they touch but do not pucker, overlap, or blanch white. White tissue means you have cut off blood supply — loosen immediately.

Step 7 — Cut the thread, leaving 1 cm tails on both sides of the knot. These tails are needed for suture removal later.

Step 8 — Move to the next stitch. Space stitches 5-8 mm apart along the wound.

Stitch Placement Strategy

Do not simply start at one end and stitch to the other. Use a halving technique:

1. Place the first stitch at the exact center of the wound.
2. Place the next stitches at the center of each half.
3. Continue halving until the spacing is 5-8 mm throughout.

This technique ensures even tension across the entire wound and prevents bunching or misalignment of the wound edges.

How Deep, How Wide, How Far Apart

Parameter	Measurement	Why
Distance from wound edge	3-5 mm	Closer risks tearing through; farther wastes tissue
Depth	Equal to or slightly deeper than wound depth	Shallow stitches leave dead space underneath where fluid collects
Spacing between stitches	5-8 mm	Closer for high-tension areas; wider for low-tension
Knot tension	Edges touching, no blanching	Too tight kills tissue; too loose leaves a gap

Needle Holder Alternatives

Without hemostats or a needle driver, you need something to grip the needle:

• Small pliers with smooth jaws (wrap jaws with cloth to prevent crushing the needle)
• Folded leather strip to grip the needle without it slipping
• Bare fingers — works but you will puncture yourself repeatedly. Wrap your gripping fingers with tape or leather
• Two flat sticks used as improvised chopsticks to grip the needle

Anesthesia: Numbing the Pain

Without lidocaine:

• Ice or cold water applied to the area for 10-15 minutes before suturing provides partial numbness.
• Alcohol on the wound causes intense burning but brief numbing afterward.
• Oral pain control: Strong spirits, willow bark tea (contains salicylic acid), or any available analgesic.
• Psychological preparation: Explain each step before you do it. The patient copes better when they know what is coming.
• Speed matters: A fast, confident suture job causes less total pain than a slow, hesitant one.

Warning

Do not give alcohol to someone in shock or who has lost significant blood. Alcohol dilates blood vessels and lowers blood pressure, which can worsen hemorrhagic shock.

Suture Removal

Sutures are removed when the wound has healed enough to hold itself together (see Wound Closure for timing by body region).

1. Clean the area with water or antiseptic.
2. Grasp one of the knot tails and lift the knot gently away from the skin.
3. Cut the thread on one side of the knot, between the knot and the skin.
4. Pull the suture out by the knot, pulling toward the wound (not away from it, which stresses the healing scar).
5. If a suture is stuck, soak with warm water for several minutes before attempting removal.

Common Mistakes

Mistake	Result	Prevention
Entering too close to wound edge	Thread tears through tissue under tension	Stay 3-5 mm from the edge minimum
Unequal depth on each side	Wound edges at different heights; one side rolls under	Match entry and exit depth precisely
Knot too tight	White, blanched tissue that dies and opens the wound	Edges touching, not squeezed; tissue should remain pink
Stitches too far apart	Wound gapes between stitches; poor healing	Maximum 8 mm apart; closer in high-tension areas
Not sterilizing materials	Deep tissue infection, abscess, sepsis	Boil or flame-sterilize everything without exception
Suturing a dirty wound	Trapped infection becomes abscess or spreads systemically	Irrigate thoroughly; when in doubt, leave open

Key Takeaways

• Monofilament fishing line and a flame-sterilized curved sewing needle are the best improvised suture materials
• The simple interrupted stitch is the most versatile and forgiving pattern — learn it first
• Enter perpendicular to the skin, 3-5 mm from the edge, and scoop deeper than the wound to close dead space
• Use the halving technique (center first, then quarter-points) for even wound alignment
• Sterilize everything, close only clean wounds, and check your tension — edges touching, never blanching white