Thyroplasty essay answer for PG exam with Images-diagrams- flowcharts under 800 words

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Here is a complete PG exam essay on Thyroplasty, structured with headings, flowcharts, and images, within 800 words:

THYROPLASTY

Definition & Introduction

Thyroplasty (laryngeal framework surgery / phonosurgery) refers to a group of external surgical procedures on the thyroid cartilage designed to alter vocal fold position, tension, or length — thereby modifying voice quality. The technique was systematically classified by Isshiki et al. (1974) into four types.

Isshiki Classification — The Four Types

┌─────────────────────────────────────────────────────────────────┐
│              ISSHIKI CLASSIFICATION OF THYROPLASTY              │
├──────────┬──────────────────────┬─────────────────────────────  │
│  TYPE    │  PROCEDURE           │  INDICATION                   │
├──────────┼──────────────────────┼─────────────────────────────  │
│  Type I  │ Medialization        │ Unilateral vocal fold         │
│          │ (implant via window) │ paralysis / paralytic        │
│          │                      │ dysphonia                     │
├──────────┼──────────────────────┼─────────────────────────────  │
│  Type II │ Lateralization       │ Spasmodic dysphonia /        │
│          │ (vocal fold pushed   │ adductor spasm               │
│          │  laterally)          │                              │
├──────────┼──────────────────────┼─────────────────────────────  │
│ Type III │ Relaxation           │ High pitch voice / mutational │
│          │ (shorten AP diameter)│ falsetto / MTD               │
├──────────┼──────────────────────┼─────────────────────────────  │
│  Type IV │ Tension increase     │ Low pitch / female-to-male   │
│          │ (lengthen AP diam.)  │ gender dysphoria             │
└──────────┴──────────────────────┴─────────────────────────────  ┘

Most commonly tested = Type I (Medialization Thyroplasty)

TYPE I — MEDIALIZATION THYROPLASTY

Definition

An open external phonosurgical procedure where a cartilage window is created in the thyroid ala and a prosthetic implant is placed lateral to the inner perichondrium to push the paralyzed vocal fold medially.

Indications

Unilateral vocal fold paralysis (primary indication)
Vocal fold bowing (presbylaryngis)
Sulcus vocalis
Cricothyroid joint fixation
Soft tissue defects after tumor excision

Contraindications

Bilateral paralysis (relative)
High aspiration risk without improvement potential
Active malignancy at surgical site

PATIENT SELECTION FLOWCHART

          DYSPHONIA / ASPIRATION
                   │
          Laryngoscopy + LEMG
                   │
      ┌────────────┴────────────┐
      │                        │
  Recovery                No recovery
  anticipated?            anticipated
      │                        │
   Yes                    Medialization
      │                   Thyroplasty
  Observe ≤6 months
      │
  No improvement
      │
  Injection or Thyroplasty

SURGICAL TECHNIQUE (Step-by-Step)

Anaesthesia: Local anaesthesia + sedation — patient must phonate intraoperatively to assess voice quality in real time.

Incision: 5 cm paramedian horizontal incision over the thyroid lamina
Exposure: Strap muscles split in midline, retracted laterally; outer perichondrium preserved
Window creation: Cartilage window marked and removed
- Size: 6 mm (vertical) × 10 mm (horizontal)
- Position: 5–10 mm posterior to midline, at the level of the true vocal fold
- Level of true fold = midpoint between anterior-inferior thyroid border and thyroid notch

Type I Thyroplasty — Montgomery sizer inserted through thyroid cartilage window to determine implant size

Intraoperative photo: Montgomery sizer being placed through the thyroid cartilage window for medialization thyroplasty.

Inner perichondrium elevated using laryngeal elevator
Sizing: Silastic sizer inserted and tested with phonation; optimum position identified
Implant inserted (Silastic block or Gore-Tex strip), secured with shim or titanium plate
Closure: Drain placed; strap muscles and skin closed in layers

Silastic implant seated within the thyroid cartilage window — intraoperative view

Rectangular window in thyroid ala with Silastic implant in situ.

IMPLANT MATERIALS

Material	Notes
Silastic (Silicone)	Most widely used; VoCoM system (3–8 mm range)
Gore-Tex (ePTFE)	Flexible, adjustable; placed as strip via inferior approach
Hydroxyapatite	Prefabricated system; bioinert
Titanium	Montgomery implant; stable, MRI-compatible

Pathology specimen showing Gore-Tex implant (arrow) within paraglottic space after medialization thyroplasty

Post-mortem specimen: pale Gore-Tex implant integrated within paraglottic space.

ADVANTAGES OF TYPE I THYROPLASTY

Performed under local anaesthesia — allows real-time voice monitoring
Reversible — implant can be removed or replaced
Preserves vocal fold mucosal integrity (implant stays lateral to inner perichondrium)
Potentially done as day-care procedure
Superior to repeated injections for permanent paralysis

ADDITIONAL PROCEDURES (Combined Surgery)

When posterior glottic gap persists or arytenoid is displaced/rotated:

Type I Thyroplasty
        +
Arytenoid Adduction   ──► Corrects posterior glottic gap
        +
Laryngeal Reinnervation ─► Maintains vocal fold tone long-term

Arytenoid adduction is superior to thyroplasty alone in flaccid paralysis with posterior gap (animal studies confirm better acoustic and aerodynamic outcomes).

COMPLICATIONS

Complication	Management
Airway compromise / hematoma	Drain, airway support
Implant extrusion / migration	Revision surgery
Infection	Antibiotics ± implant removal
Suboptimal voice (under/over-medialization)	Revision; adjust implant size
Persistent posterior glottic gap	Add arytenoid adduction

TYPE III THYROPLASTY (Bonus — often asked)

Type III thyroplasty — thyroid cartilage imbricated (overlapped) to shorten AP diameter and reduce pitch

Intraoperative view of Type III thyroplasty: thyroid cartilage segments imbricated with sutures to relax vocal fold tension and lower pitch — used in mutational falsetto and transgender (FTM) voice surgery.

KEY EXAM POINTS

Isshiki classified thyroplasty into Types I–IV (1974)
Type I = medialization — most common and most tested
Done under local anaesthesia for intraoperative voice monitoring
Window: 6 × 10 mm, 5–10 mm from midline, at true vocal fold level
Implants: Silastic, Gore-Tex, Hydroxyapatite, Titanium
Complications: airway compromise, extrusion, suboptimal voice
Arytenoid adduction added when posterior gap is not closed by thyroplasty alone

Sources: Cummings Otolaryngology Head and Neck Surgery; KJ Lee's Essential Otolaryngology

Thyroplasty essay answer

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