At a glance
If you have been told you need a seton for your fistula, understanding the difference between cutting and draining setons helps you know what to expect. These are different tools with different purposes, even though they look similar — a loop placed through the fistula tract.
Draining seton
Purpose
A draining seton keeps the fistula tract open so that infected fluid can drain continuously. This prevents abscess formation and allows the surrounding tissue to settle. It is a management step — it controls the fistula rather than curing it.
How it works
- A loose loop of material (silicone, suture, vessel loop) is threaded through the fistula tract
- It sits loosely — it is not tight against the tissue
- Infected material drains along the loop rather than accumulating
- The surrounding inflammation gradually reduces
When it is used
- As a first step for complex fistulas before definitive surgery
- To control recurrent abscesses while a treatment plan is developed
- In fistulas associated with Crohn’s disease, where controlling infection is a priority
- When the surgeon needs time to assess the fistula before deciding on definitive treatment
Duration
Draining setons are often left in place for weeks to months. Some people have them for extended periods, particularly with Crohn’s-related fistulas.
Cutting seton
Purpose
A cutting seton gradually divides the sphincter muscle in a controlled way. As the seton cuts through tissue, the tissue behind it heals. This staged approach avoids dividing the full thickness of the muscle in a single cut.
How it works
- A loop of material is placed through the fistula tract
- It is tightened at intervals (typically every few weeks)
- Each tightening cuts through a small amount of muscle
- The tissue heals behind the advancing seton
- Eventually, the seton cuts through completely and falls out
When it is used
- For fistulas that involve a significant amount of sphincter muscle
- When a single-stage fistulotomy would risk incontinence
- When the surgeon wants to divide the muscle gradually rather than all at once
- Less commonly used now that other techniques are available
Duration
The process typically takes weeks to months, depending on how much tissue needs to be divided and how frequently the seton is tightened.
Key differences
| Feature | Draining seton | Cutting seton |
|---|---|---|
| Purpose | Drain infection | Divide muscle gradually |
| Tension | Loose | Progressively tightened |
| Pain | Minimal once settled | Discomfort at tightenings |
| Duration | Weeks to months | Weeks to months |
| Outcome | Preparation for further treatment | Gradual fistula resolution |
| Current use | Common | Less common |
Living with a seton
Regardless of type, living with a seton involves:
- Keeping the area clean — gentle washing, sitz baths
- Managing any discharge with pads
- Being aware of the loop during activity (though most people adapt quickly)
- Regular follow-up appointments with the surgical team
- Patience — setons are a process, not a quick fix