Interrupted and Continuous Suturing

An interrupted closure places and ties each stitch separately, so every stitch is an independent unit. A continuous closure runs one strand along the wound and secures it at each end, so the whole line shares a single strand. The difference is how load and any failure are distributed.

By Dolphin Sutures Reviewed by Dolphin Sutures Last reviewed July 19, 2026

Why it matters

The two patterns are not variations of the same thing; they distribute load differently and they fail differently. In an interrupted line each stitch is mechanically independent of its neighbours. In a continuous line they are coupled through the strand. That distinction is what a clinician is reasoning about, and it is a property of the arrangement rather than of any suture material.

Two arrangements of the same components

Both patterns use the same things: a needle, a strand, and a series of bites through tissue. What differs is how those bites are connected to one another.

In an interrupted closure each stitch is placed, tied and cut before the next is placed. Every stitch is a complete unit, and it is mechanically independent of the stitches on either side of it.

In a continuous closure a single strand runs the length of the wound, secured at the beginning and again at the end. The bites are still individual passages through tissue, but they are now coupled — they share one strand, and tension anywhere along it is communicated along the line.

That coupling is the whole of the difference. Everything else usually said about these patterns follows from it.

Three ways the same thread closes a wound. Interrupted places separate stitches, each knotted independently, so one loosening does not affect the others. Continuous runs a single thread along the wound with a knot at each end. A mattress stitch passes back across the line so it grips a wider bite of tissue. The differences are geometric, and each has situations it suits; this figure sets them side by side without ranking them.

What follows from the coupling

Because an interrupted line ties every stitch, it contains a knot per stitch. A continuous run contains two. Each knot is a point where the strand crosses and bears on itself, which is why knot security belongs in the same conversation as pattern rather than in a separate one.

Strand length follows too. A continuous run needs a single length adequate for the whole closure; an interrupted line uses a fresh length each time. That is arithmetic, not technique, but it determines what is opened onto the field.

A barbed strand sits inside the continuous family while changing its characteristic feature. It runs the length of the closure like any continuous suture, but its anchorage is distributed along the barbs rather than concentrated at knots — so it is continuous in arrangement without being continuous in the way load reaches the anchor points.

The question “which is better” has no answer that is true independent of the tissue, the plane, the case and the surgeon. Both patterns are in routine use, which is itself the evidence that neither is generally correct.

Choosing between them is a surgical decision. Describing how they differ is a reference function, and that is where this page stops. For any handling guidance attached to a specific product, the instructions for use supplied with that product is the controlled document.

Key terminology

Interrupted: A pattern in which each stitch is placed, tied and cut individually before the next is placed.
Continuous: A pattern in which a single strand runs the length of the closure, secured at the beginning and the end rather than at each bite.
Bite: A single passage of the needle through tissue on one side of the wound.
Apposition: Bringing tissue edges into contact so they sit against one another.
Load distribution: How tension along a closure is shared between the stitches that make it up. It differs between the two patterns because of how the strand is arranged.
Suture length required: A continuous run uses one length of strand for the whole closure; an interrupted line uses a separate length for every stitch. This is an arithmetic consequence of the pattern.

Technical characteristics

Interrupted — arrangement: Each stitch placed, tied and cut separately
Interrupted — coupling: Stitches are mechanically independent of one another
Continuous — arrangement: One strand run along the closure, secured at each end
Continuous — coupling: Stitches are coupled through the shared strand
Number of knots: Interrupted, one per stitch. Continuous, one at each end of the run.
Choice of pattern: A surgical technique decision made by the operator against the tissue and the case. Not specified here.
Product guidance: Where a product's instructions for use carry handling or pattern guidance, that document governs and varies by market.

How it compares

Mechanical arrangement of the two patterns. This describes how each is built, not which should be used — that decision belongs to the surgeon.
Pattern	Knots	Stitch coupling	If one stitch is disturbed
Interrupted	One per stitch	Independent	The others remain independent of it
Continuous	One at each end of the run	Coupled through the strand	The line shares a strand along its length
Continuous, knotless (barbed)	None by design	Coupled through the strand	Anchorage is distributed along the barbed length

What clinicians weigh when selecting

Independence against coupling

The trade-off is between stitches that act separately and stitches that share a strand. Both arrangements are used, and which is appropriate is a judgement about the tissue and the case.

Number of knots in the closure

An interrupted line contains a knot per stitch; a continuous run contains two. Each knot is a crossing point where the strand bears on itself, which is why knot security is discussed alongside pattern.

Strand length and gauge

A continuous run needs one length sufficient for the whole closure. That is arithmetic rather than technique, but it affects what is opened onto the field.

Barbed strands change the question

A knotless barbed strand runs continuously but anchors along its length rather than at knots. It belongs to the continuous family without inheriting its knot arrangement.

The tissue is the variable, not the material

Pattern is chosen against the tissue, the plane and the case. Suture material is a separate decision, made against a different set of properties.

This page does not choose

Which pattern to use, where, and for what is a surgical decision. A reference page that answered it would be instructing surgery rather than describing a technique.

Frequently asked questions

Which is better, interrupted or continuous?

We do not answer that, and no reference page should. They distribute load differently and both are in routine use. The choice is made by the operating surgeon against the tissue and the case.

What is the actual mechanical difference?

In an interrupted line each stitch is tied separately and is mechanically independent of its neighbours. In a continuous line one strand runs the length of the closure, so the stitches are coupled through that strand.

How many knots are in each?

An interrupted closure contains one knot per stitch. A continuous run contains one at the start and one at the end.

Does the suture material determine the pattern?

No. Pattern is chosen against the tissue and the case; material is chosen against its own properties. They are separate decisions, though handling characteristics are felt in both.

Where does a barbed suture fit?

A barbed strand runs continuously but anchors along its barbed length rather than at tied knots, so it is continuous in arrangement without the knots at either end.

Is there guidance in the instructions for use?

Some products carry handling guidance in their instructions for use. Where they do, that document is the controlled source and it varies by product and market.

Instructions for use

The instructions for use supplied with the product is the controlled document for indications, contraindications, warnings, precautions and any handling guidance. Where this article and the instructions for use differ, the instructions for use govern. Approved indications vary by market. The choice of suture pattern is a matter for the operating surgeon.

Medical & regulatory notice

This article is general reference information for healthcare professionals describing how two suture patterns are arranged. It is not medical advice, not surgical instruction, not a recommendation for any technique, procedure or patient, and not a substitute for the instructions for use supplied with the product or for clinical judgement. Product availability and approved indications vary by market. Dolphin Sutures manufactures surgical sutures; nothing here should be read as a claim of clinical benefit or of superiority over another material or technique.

References

Written by Dolphin Sutures Medical content, reviewed before publication

Reviewed by Dolphin Sutures In-house regulatory and quality review

Last reviewed July 19, 2026 Reviewed on a scheduled cycle