Type 3 thyroplasty (relaxation thyroplasty)

Where the name comes from

Nobuhiko Isshiki described four laryngeal framework operations, numbered by what they do to the vocal folds. Type 1 medialises a fold, type 2 lateralises, type 3 relaxes, and type 4 tenses. Type 3 is therefore the pitch-lowering operation and type 4 — cricothyroid approximation — is the pitch-raising one. The numbering is about mechanics, not sequence.

How it is performed

1. Access

   General anaesthetic, sometimes with a period awake so the surgeon can hear the voice intraoperatively. A horizontal incision, 3–5 cm, in a natural neck crease over the thyroid cartilage.

2. Exposure

   Strap muscles are separated in the midline and retracted to expose the thyroid cartilage laminae on both sides.

3. Resection

   A vertical strip of cartilage — typically 3 to 6 mm — is removed from each lamina, positioned so the vocal folds are not entered. Width of the strip is the main determinant of how much pitch drops.

4. Approximation

   The remaining cartilage edges are brought together and fixed with sutures or miniplates. The anteroposterior dimension of the larynx is now shorter, the folds are slacker, and resting frequency falls.

5. Closure

   Layered closure, sometimes a small drain, one night in hospital for airway observation.

What the literature reports

• Reduction in speaking fundamental frequency of roughly 2 to 5 semitones.
• Pitch range narrows, with loss at the top more consistent than gain at the bottom.
• Voice quality is usually preserved, since the vibrating mucosa is not incised.
• Series are small. Nobody has run a large randomised trial of this operation and nobody is likely to, so treat all figures as ranges from case series rather than as established averages.

Type 3 thyroplasty vs the alternatives

The row that matters most is the last one. If testosterone is an option for you and you have been on it under twelve months, it is doing this job for free and surgery should wait.

How much cartilage comes out, and why that number matters

The resection width is the single lever the surgeon has on your result, and it is a genuine trade-off rather than a setting to maximise. Typical strips are 3 to 6 mm per side. Wider means more shortening and more pitch drop; it also means less remaining cartilage to hold the framework stable, a narrower airway at the level of the resection, and a higher risk that the approximation heals badly.

Two anatomical facts set your personal ceiling. The first is the thickness and angle of your thyroid cartilage, which varies substantially between individuals and is assessed directly at surgery. The second is where your vocal folds attach on the inner surface — remove cartilage encroaching on that and you destabilise the attachment rather than slackening the fold. This is why the honest answer to "how many semitones can I get" is that nobody knows until the larynx is exposed, and why a surgeon quoting you a specific figure in advance is telling you something they cannot know.

Under-correction is therefore the safe failure mode and the common one. A surgeon who reports no under-corrections in their series either has a very small series or is resecting more aggressively than most would.

Awake assessment during surgery

Some surgeons perform part of this operation with the patient awake, or wake them briefly before closing, so the voice can be heard and the resection adjusted. Others complete it under general anaesthetic throughout and rely on measurement.

Neither approach is the consensus standard. What is worth asking is which your surgeon does and how they justify it — the quality of that answer tells you more about their thinking than the choice itself does.

Fixation: sutures, plates, or both

Once the cartilage strips are removed, the remaining edges have to be held together while they heal. Sutures alone are simplest and leave nothing behind. Titanium miniplates hold the position more rigidly, which some surgeons prefer where a wider resection was needed, at the cost of hardware that can be palpable in a thin neck and very occasionally needs removal. Both are in routine use and both work.

Injection augmentation as an alternative or an adjunct

Adding mass to the vocal folds also lowers pitch, and it can be done by injection without opening the neck. It delivers less — roughly 1 to 2 semitones — and with temporary materials the effect resorbs over months.

That combination of properties makes it useful in two specific situations. As a trial, a temporary injection lets someone hear approximately what a lower voice sounds like on their own body before committing to an irreversible operation, which is a genuinely valuable thing to be able to do. And as an adjunct, it can close a small gap after an under-corrected thyroplasty without a second framework operation. It is not a substitute for thyroplasty where a large drop is needed.

What the first year after surgery looks like

• Weeks 1–2. Voice rest, then quiet graded speech. Pitch is low but breathy and weak. Swallowing feels tight.
• Weeks 3–8. Loudness returning. Pitch unstable, sometimes breaking upward under effort. This is normal and not a failed result.
• Months 3–6. Pitch settles. Therapy stabilises it and rebuilds projection. Acoustic re-measurement against baseline becomes meaningful here, not before.
• Months 6–12. Final pitch and range. Scar softening and fading. Any revision discussion belongs in this window at the earliest.

The full pathway including candidacy, exclusions and costs is on the voice deepening surgery page.

Risks specific to this technique

• Under-correction from a conservative resection — the commonest disappointment, and preferable to the alternative.
• Over-resection risking airway narrowing or an unstable framework.
• Loss of upper range, expected rather than exceptional.
• Neck scar, unavoidable with an external approach.
• Plate or suture palpability in thin necks.
• Airway swelling in the first 48 hours, which is why the first night is inpatient.

Frequently asked

How much cartilage is removed in type 3 thyroplasty?

Typically a 3 to 6 mm vertical strip from each thyroid lamina. Wider resection means more pitch drop but less remaining cartilage to hold the framework stable. Your ceiling is set by cartilage thickness and by where the vocal folds attach on the inner surface, which is assessed at surgery rather than in advance.

Can a temporary injection be used as a trial before thyroplasty?

Yes, and it is genuinely useful. Injection augmentation adds mass to the vocal folds and lowers pitch by roughly 1 to 2 semitones, and with temporary materials the effect resorbs over months. That lets you hear approximately what a lower voice sounds like on your own body before committing to an irreversible operation. It is not a substitute where a large drop is needed.

What is type 3 thyroplasty?

Type 3 thyroplasty, or relaxation thyroplasty, is the laryngeal framework operation that lowers vocal pitch. A vertical strip of thyroid cartilage, usually 3 to 6 mm, is removed from each lamina and the edges are approximated, shortening the larynx front to back so the vocal folds slacken and vibrate more slowly.

Why is it called type 3?

Nobuhiko Isshiki numbered four laryngeal framework operations by their effect on the vocal folds: type 1 medialises, type 2 lateralises, type 3 relaxes and type 4 tenses. Type 3 is therefore the pitch-lowering operation and type 4, cricothyroid approximation, is a pitch-raising one. The numbers describe mechanics, not sequence.

How much pitch drop does type 3 thyroplasty give?

Published case series report reductions in speaking fundamental frequency of roughly 2 to 5 semitones. The width of cartilage removed is the main determinant. The series are small — no large randomised trial of this operation exists — so treat all figures as ranges rather than averages.

Is type 3 thyroplasty done awake or asleep?

Usually under general anaesthetic. Some surgeons include a period with the patient awake so the voice can be assessed intraoperatively and the resection adjusted. Ask which your surgeon does and why.

Full pathway, candidacy criteria, recovery and costs: voice deepening & masculinization surgery. If your reason for wanting a lower voice is a high-pitched adult voice with normal anatomy, start with puberphonia instead.