science

Hyoid suspension

Hyoid suspension is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Hyoid suspension rather than just read about it. In short: Hyoid suspension, also known as hyoid myotomy and suspension or hyoid advancement, is a surgical procedure or sleep surgery in which the hyoid bone and its muscle attachments to the tongue and airway are pulled forward with the aim of increasing airway size and improving airway stability in the retrolingual and hypopharyngeal airway (airway behind and below the base of tongue). The horseshoe shaped hyoid bone sits d…

Key takeaways

Hyoid suspension belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Hyoid suspension to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Hyoid suspension from memory before moving on to harder problems.

Reference excerpt

Hyoid suspension, also known as hyoid myotomy and suspension or hyoid advancement, is a surgical procedure or sleep surgery in which the hyoid bone and its muscle attachments to the tongue and airway are pulled forward with the aim of increasing airway size and improving airway stability in the retrolingual and hypopharyngeal airway (airway behind and below the base of tongue). The horseshoe shaped hyoid bone sits directly below the base of tongue with the arms of the bone flanking the airway. Hyoid suspension is typically performed as a treatment for obstructive sleep apnea (OSA). This procedure is frequently performed with a uvulopalatopharyngoplasty (UPPP) which targets sites of obstruction higher in the airway. Typically, a hyoid suspension is considered successful when the patient's apnea-hypopnea index is significantly reduced after surgery.

Background The American Academy of Otolaryngology–Head and Neck Surgery position statement considers hyoid suspension "effective and non-investigational with proven clinical results when considered as part of the comprehensive surgical management of symptomatic adult patients with mild obstructive sleep apnea (OSA) and adult patients with moderate and severe OSA assessed as having tongue base or hypopharyngeal obstruction." The American Sleep Apnea Association (ASAA) website describes hyoid suspension as a minimally invasive procedure where: "Success from this procedure has been outstanding and is becoming a valuable tool in the surgeon's armamentarium." Hyo-mandibular advancement along with genioglossus advancement was originally described by in 1984. Published clinical experience with hyoid suspension can be summarized into three different approaches to the hyoid suspension procedure: hyo-mandibular suspension, hyo-thyroid suspension, and genioglossus advancement and hyoid myotomy.

Hyo-mandibular suspension In hyo-mandibular suspension, sutures are looped around the anterior section of the hyoid bone, the hyoid is advanced typically 2–3 centimeters (until the muscle attachments to the hyoid are tensioned) using the sutures, and the hyoid advancement is locked into place and secured via bone anchors on the front lower inside portion of the jaw. This procedure is typically performed with two incisions, one incision under the chin for placement of bone anchors into the jaw and one incision directly over the hyoid bone for the most direct access to the bone. Some surgeons perform the procedure from only the single incision below the chin. Potential complications and side effects from the procedure include neck seromas, edema, and surgical site infection.

Hyo-thyroid suspension In hyo-thyroid suspension, sutures are looped around the hyoid, and the hyoid bone is advanced using the sutures to the upper edge of the thyroid cartilage where it is sutured and tied to the top of the thyroid cartilage. This procedure is typically performed from a single incision directly over the hyoid bone. Potential complications and side effects from the procedure include neck seromas, edema, transient dysphagia, and surgical site infection.

Genioglossus advancement and hyoid myotomy (GAHM) In genioglossus advancement and hyoid myotomy (GAHM), a genioglossus advancement is performed at the same time as either a hyo-mandibular or hyo-thyroid suspension. Potential complications and side effects from the procedure include lip and chin hypoanesthesia, seromas, edema, transient dysphagia and aspiration, and surgical site infection.

Clinical results Published clinical results for hyoid suspension performed with a UPPP are presented in the table below. Surgical success typically means that the AHI is reduced at least 50% and that the post-operative AHI is less than 20.

Published clinical information for the three hyoid suspension variations without a UPPP is very limited. For many years, a genioglossus advancement was consistently performed with a hyoid suspension where the more invasive and morbid genioglossus advancement was considered a necessary component for the overall success of the tongue base intervention. Hyo-thyroid suspension published evidence comes entirely from Europe where the low cost, reduced morbidity, and nearly equivalent results to GAHM have made it the preferred technique. Recent publications have suggested that hyo-mandibular suspension may be the most effective hyoid suspension technique in treating tongue base and hypopharyngeal obstructions. The technique is similarly invasive to hyo-thyroid suspension and available clinical data shows 25% greater efficacy for the reduction of AHI when compared to hyo-thyroid suspension. Data available for hyo-mandibular suspension also shows similar superior efficacy to the GAHM procedure. Hyo-mandibular suspension requires a surgical kit and implants (Siesta Medical Encore or Medtronic Airvance) which make the procedure marginally more expensive than hyo-thyroid suspension.

References

Illustrations

Worked examples

Example 1 — a first encounter with Hyoid suspension

Start with the simplest possible case. Write down what Hyoid suspension claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Hyoid suspension before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Hyoid suspension ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Hyoid suspension

In research: Hyoid suspension appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Hyoid suspension in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Hyoid suspension is common in secondary-school and first-year university syllabi. It links to neighbouring topics Oral and maxillofacial surgery, Sleep surgery, Tongue surgery, so understanding it makes those chapters shorter.
In everyday life: Look for Hyoid suspension outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Hyoid suspension in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Hyoid suspension means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Hyoid suspension out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Hyoid suspension in simple terms?

Why does Hyoid suspension matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Hyoid suspension?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Hyoid suspension.