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STAPEDECTOMY — A Comprehensive Account for 50 Marks

(RGUHS MS ENT / DNB Level — Scott-Brown • Cummings • Stell & Maran • Zakir Hussain • Dhingra • Hazarika • Recent Advances)

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TABLE OF CONTENTS

1. Historical Background
2. Surgical Anatomy
3. Otosclerosis — Etiology & Pathology
4. Clinical Features of Otosclerosis
5. Audiological Assessment
6. Indications & Contraindications
7. Pre-operative Work-up
8. Anesthesia
9. Instruments
10. Surgical Steps — Stapedectomy (Classic)
11. Stapedotomy vs Stapedectomy
12. Prostheses
13. Intraoperative Complications
14. Post-operative Care
15. Results & Prognosis
16. Complications (Post-operative)
17. Revision Stapedectomy
18. Special Situations
19. Recent Advances
20. Flowcharts & Summary Tables
21. Diagrams (with embedded images)

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1. HISTORICAL BACKGROUND

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2. SURGICAL ANATOMY

The Ossicular Chain

Malleus ──► Incus ──► Stapes
(Handle → Umbo)  (Body + 2 crura)  (Head + Neck + Anterior/Posterior Crura + Footplate)

Stapes — Detailed Anatomy

         HEAD (articulates with incus via lenticular process)
           |
         NECK
        /    \
  ANTERIOR   POSTERIOR
    CRUS        CRUS
        \    /
       FOOTPLATE
   (in oval window, ~3×1.4 mm)
   
Annular ligament = suspensory ligament of footplate in oval window

• Facial nerve — runs in its bony canal (tympanic segment) just superior to the oval window, occasionally dehiscent (in 15–20% of cases)
• Chorda tympani nerve — runs between malleus handle and long process of incus, may need to be displaced or sacrificed
• Saccule — lies just beneath the footplate, only 0.9–1.0 mm from it (risk of saccular rupture during footplate manipulation)
• Promontory — medial wall of middle ear
• Stapedius muscle — inserts into posterior neck of stapes via pyramidal eminence
• Round window — lies in round window niche, inferior and posterior to oval window

Fishman's Rule (Stell & Maran, 5th ed.):

The distance between the footplate and the utricle/saccule is critically thin — trauma during surgery is the chief mechanism of sensorineural hearing loss.

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3. OTOSCLEROSIS — ETIOLOGY & PATHOLOGY

Definition

Etiology (Multifactorial)

┌─────────────────────────────────────┐
│         ETIOLOGY OF OTOSCLEROSIS    │
├──────────────────┬──────────────────┤
│ Genetic          │ AD, incomplete   │
│                  │ penetrance ~25%  │
│                  │ (multiple loci:  │
│                  │ OTSC1-OTSC8)     │
├──────────────────┼──────────────────┤
│ Viral            │ Measles virus    │
│ (Hazarika)       │ antigen in       │
│                  │ otosclerotic     │
│                  │ foci; MMR        │
│                  │ vaccination      │
│                  │ reduces risk     │
├──────────────────┼──────────────────┤
│ Hormonal         │ Estrogen         │
│                  │ accelerates —    │
│                  │ worse in         │
│                  │ pregnancy        │
├──────────────────┼──────────────────┤
│ Autoimmune       │ Elevated IgG,    │
│                  │ complement       │
│                  │ activation in    │
│                  │ otic capsule     │
└──────────────────┴──────────────────┘

Epidemiology

• Incidence: 1 in 300 white adults (clinical); histological in 10–12% of white adults
• M:F = 1:2
• Onset: 2nd–4th decade
• Bilateral in 70–80%
• Less common in Asians & Africans

Pathology (Zakir Hussain ENT, 3rd ed.)

1. Fissula ante fenestram (anterior to oval window) — MOST COMMON (80–90%)
2. Round window niche
3. Posterior footplate
4. Cochlear endosteum (causes cochlear otosclerosis → SNHL)

Otospongiotic focus →
  ↓ (active phase: blue mantles of Manasse, vascular lakes)
  ↓
Mature otosclerotic bone →
  ↓ (quiescent phase: dense sclerotic bone)
  ↓
Footplate fixation → Conductive hearing loss

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4. CLINICAL FEATURES

Symptoms (Dhingra, 7th ed., p. 97–98)

1. Progressive bilateral conductive hearing loss — insidious, worse in noisy environment (Paracusis Willisii — paradoxical hearing improvement in noisy surroundings)
2. Tinnitus — low frequency, often pulsatile
3. Vertigo — uncommon, suggests cochlear extension

Paracusis Willisii

• Companions raise their voice in noise
• Background masking of tinnitus
• Vibration conduction helps (not accepted universally)

Signs

• Ear canal and TM: Normal (key feature)
• Schwartze sign (if present)
• On audiometry: characteristic pattern (see Section 5)
• Negative Rinne at 256/512 Hz
• Weber lateralized to worse ear

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5. AUDIOLOGICAL ASSESSMENT

Pure Tone Audiogram in Otosclerosis

FREQUENCY (Hz): 250  500  1000  2000  4000  8000
                                       
AIR CONDUCTION:   ·    ·    ·    ·     ·     ·    (elevated thresholds)
BONE CONDUCTION:  ·    ·    ·    ·     ↓     ·    
                                    Carhart's notch
                                    at 2000 Hz

• Mechanical resonance artefact
• BC dip of 5 dB at 500 Hz, 10 dB at 1000 Hz, 15 dB at 2000 Hz, 5 dB at 4000 Hz
• Disappears after successful surgery
• Not a true SNHL — it is a mechanical phenomenon

Impedance Audiometry

Speech Audiometry

• Speech Discrimination Score (SDS): Usually >85% (good cochlear reserve)
• Useful for predicting post-operative outcome

HRCT Temporal Bone (Cummings, 7th ed., p. 2087)

• Double ring sign (halo around cochlea) in cochlear otosclerosis
• Hypodensity around oval window in active lesions
• CT grading by Symons & Fanning (Grade 1: fenestral only → Grade 4: extensive cochlear)

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6. INDICATIONS AND CONTRAINDICATIONS

INDICATIONS (Scott-Brown, 8th ed.; Hazarika ENT, 4th ed.)

1. Otosclerosis with ABG ≥30 dB
2. Negative Rinne at 512 Hz
3. Type As tympanogram
4. Absent stapedial reflexes
5. Satisfactory speech discrimination score (>60%)
6. Good cochlear reserve

1. Only-hearing ear (controversial — some surgeons prefer hearing aid)
2. Mixed hearing loss (SNHL <30 dB)
3. Patient preference over hearing aids

CONTRAINDICATIONS

• Active Schwartze sign (active otospongiosis — defer, use fluoride)
• Pregnancy (defer until postpartum)
• Extremely high-risk medical status
• Occupation with pressure changes (divers, pilots) — controversial
• Age >70 years (increased cochlear fragility) — relative

BEST EAR RULE (Dhingra):

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7. PRE-OPERATIVE WORK-UP

FLOWCHART 1: PRE-OPERATIVE ASSESSMENT FOR STAPEDECTOMY

Patient with bilateral progressive CHL
             ↓
Clinical examination (normal TM, ear canal)
             ↓
Audiological workup:
  ├── PTA: Air-bone gap ≥30 dB
  ├── Impedance: Type As + absent reflexes
  ├── SDS: ≥60%
  └── Carhart's notch at 2 kHz
             ↓
HRCT temporal bone
  ├── Fenestral otosclerosis confirmed
  ├── Rule out superior canal dehiscence
  └── Assess cochlear extension
             ↓
Pre-anesthetic checkup
  ├── CBC, bleeding time, clotting time, PT/INR
  ├── Blood sugar, urea, creatinine
  └── ECG, CXR, blood grouping
             ↓
Informed consent (risk of SNHL, taste disturbance, facial nerve palsy)
             ↓
Operate on WORSE hearing ear first

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8. ANESTHESIA

• General anesthesia — preferred (patient remains still; better intraoperative control)
• Local anesthesia with sedation — also used; allows patient feedback on hearing improvement intraoperatively
  • Injection: 2% xylocaine with 1:100,000 adrenaline — injected into 4 quadrants of EAC
• Hypotensive anesthesia — reduces bleeding in the surgical field

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9. INSTRUMENTS (Zakir Hussain; Hazarika)

Essential Instruments:

1. Speculum — large-sized aural speculum
2. Specula holder (Siegle's or adjustable)
3. Flap knife (sickle knife / round knife)
4. Curet / Cottle elevator — for raising tympanomeatal flap
5. Malleus head holder / hook — for gentle manipulation
6. Picks / right-angled hooks — fracturing crura
7. Microdrill / perforator / Fisch drill — creating fenestra in footplate
8. Measuring rod (gauge) — measuring from footplate to incus (typically 4.25–4.75 mm)
9. Crimping forceps — for crimping prosthesis onto long process of incus
10. Micro scissors / stapes scissors — for cutting crura
11. Suction tubing — fine-tipped, non-traumatic

Prostheses Available:

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10. SURGICAL STEPS — CLASSIC STAPEDECTOMY

Patient Position

• Supine, head turned away from operated side
• Slight reverse Trendelenburg (15°) to reduce venous oozing

Step-by-Step Technique (Scott-Brown, Cummings, Stell & Maran, Hazarika)

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Incision sites in EAC:
  ┌─────────────────────────────────────┐
  │  Posterior EAC wall                 │
  │                                     │
  │  Incision 1: 12 o'clock position    │
  │  Incision 2:  6 o'clock position    │
  │  Connected ~2-3 mm from annulus     │
  │                                     │
  │  Tympanomeatal flap elevated        │
  │  anteriorly to expose annulus       │
  └─────────────────────────────────────┘

• A posterior tympanomeatal flap is raised using a sickle knife
• The fibrous annulus is elevated from the sulcus tympanicus starting at 12 o'clock
• The flap is reflected anteriorly, carrying with it the posterior part of TM

• The posterosuperior bony overhang (scutum) is removed with a curette (±drill) to expose:
  • Incudostapedial (IS) joint
  • Stapes superstructure
  • Long process of incus
  • Oval window
  • Facial nerve canal
  • Chorda tympani

• Confirm stapes fixation by gentle palpation with probe
• Note any:
  • Biscuit footplate (thick, obliterated footplate)
  • Floating footplate
  • Obliterative otosclerosis (entire footplate/oval window obliterated)
  • Vascular promontory (persistent stapedial artery)
  • Facial nerve overhanging oval window

• The IS joint is divided with a joint knife or right-angle hook
• Done gently to avoid dislocating the incus from the incudomalleolar joint

   Posterior crus cut first → with right-angled scissors or laser
   Then Anterior crus → similarly
   Superstructure removed by fracturing at the footplate level

• Alternatively: Laser (KTP or CO₂) vaporizes crura — reduces mechanical trauma

FLOWCHART 2: FOOTPLATE MANAGEMENT

Stapes superstructure removed
         ↓
    Assess footplate
         ↓
  ┌──────────────────────────────────────────┐
  │         TYPE OF FOOTPLATE                │
  └──┬─────────────────┬──────────────────┬──┘
     ↓                 ↓                  ↓
NORMAL THICKNESS  THICK/BISCUIT    OBLITERATIVE
('White')         footplate        footplate
     ↓                 ↓                  ↓
STAPEDOTOMY       Microdrill/       Diamond bur
(small fenestra)  laser fenestra    fenestration
4-mm perforator   0.6–0.8 mm       "blue footplate"
     ↓                 ↓                  ↓
         PISTON PROSTHESIS INSERTED

• Entire footplate is removed in fragments using:
  • Footplate pick / right-angle hook to crack into halves
  • Remove posterior half first, then anterior half
  • Perilymph wells up — remove gently without suctioning perilymph

• Perforator / Fisch drill creates a 0.6–0.8 mm fenestra in footplate
• Positioned at center of footplate or posterior third
• Laser (KTP, CO₂) increasingly used

• Vein graft (from dorsum of hand), fat plug, or perichondrium used to seal oval window
• Graft prevents perilymph leak and provides bed for prosthesis

• The piston fits snugly — no graft needed (or small fat/blood seal)

Measurement:
  Distance from footplate/oval window rim → long process of incus
  = Typically 4.25–4.75 mm
  Add 0.25–0.5 mm for insertion depth

Prosthesis inserted:
  - Piston through fenestra into perilymph (0.5–1.0 mm)
  - Loop placed over long process of incus
  - Crimped with forceps — snug but not too tight
    (over-crimping → incus necrosis; under-crimping → prosthesis migration)

• Malleus is gently moved — transmission through prosthesis to footplate confirmed
• TM mobility checked
• No perilymph leak around prosthesis

• Tympanomeatal flap repositioned
• Absorbable gelatin sponge (Gelfoam) / Spongostan pieces placed in EAC
• External ear canal packed with antibiotic ribbon gauze

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11. STAPEDOTOMY vs STAPEDECTOMY

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12. PROSTHESES IN DETAIL

Types of Prostheses

PROSTHESIS CLASSIFICATION
│
├── By Design
│    ├── Wire-type (loop over incus + piston into oval window)
│    ├── Clip-type (auto-crimping / nitinol clip)
│    └── Bucket-handle (rare)
│
├── By Material
│    ├── Stainless steel (McGee)
│    ├── Teflon/PTFE (Fisch, Robinson)
│    ├── Titanium (MRI safe, lightweight)
│    ├── Gold (MRI safe, biocompatible)
│    └── Nitinol (shape-memory alloy — thermal crimping at 45°C)
│
└── By Size
     ├── Diameter: 0.4 mm, 0.6 mm, 0.8 mm
     └── Length: 3.5–5.0 mm (standard 4.5 mm)

• Loop made of shape-memory alloy
• When heated to body temperature, loop contracts and self-crimps around incus
• Reduces manual crimping errors and incus trauma

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13. INTRAOPERATIVE COMPLICATIONS

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14. POST-OPERATIVE CARE

IMMEDIATE (0–24 hours):
  - Bed rest with head elevated 30°
  - IV antibiotics (Cefuroxime or Augmentin)
  - Antiemetics (Ondansetron/Metoclopramide)
  - Analgesics (avoid NSAIDs if possible)
  - Nothing by mouth initially (if GA)
  - Monitor for: severe vertigo, nausea/vomiting, facial nerve function
  
DISCHARGE (Day 1–2):
  - Oral antibiotics (7–10 days)
  - Ear drops (antibiotic + steroid)
  - Strict instructions: NO nose blowing, NO Valsalva
  - Avoid bending, straining, heavy lifting
  - Avoid water entry into ear (2–4 weeks)
  
FOLLOW-UP:
  - Week 1–2: Remove ear packing
  - Week 4: First audiogram
  - Week 12: Final audiogram (ABG assessment)

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15. RESULTS AND PROGNOSIS

Success Criteria:

• Post-operative ABG ≤10 dB — excellent result
• Post-operative ABG ≤15 dB — good result
• Post-operative ABG ≤20 dB — acceptable

Success Rates (Literature):

Prognostic Factors:

• Good prognosis: Young age, good preoperative BC, large preoperative ABG, high SDS
• Poor prognosis: Cochlear otosclerosis, obliterative footplate, revision surgery, elderly

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16. POST-OPERATIVE COMPLICATIONS

FLOWCHART 3: POST-OPERATIVE COMPLICATIONS

Post-stapedectomy patient
         ↓
   ASSESS TIMING
    ↙          ↘
EARLY           LATE
(0–2 weeks)     (>2 weeks)
    ↓               ↓
┌───────────┐   ┌────────────────────┐
│• Vertigo  │   │• Conductive HL     │
│• SNHL     │   │  (prosthesis dis-  │
│• Facial   │   │  placement/fibrosis│
│  palsy    │   │• SNHL (late)       │
│• Perilymph│   │• Perilymph fistula │
│  fistula  │   │• Reparative        │
│• Infection│   │  granuloma         │
└───────────┘   │• Incus necrosis    │
                │• Taste change      │
                │• Tinnitus          │
                └────────────────────┘

Detailed Complications:

• Incidence: 1–2% (sudden profound) / 5–10% (mild-moderate)
• Causes: Suction of perilymph, trauma to saccule, infection, fibrous obliteration
• Management: High-dose IV corticosteroids (Dexamethasone 8 mg 8-hourly × 5 days), bed rest, hyperbaric oxygen

• Prosthesis too long → piston presses into saccule
• Features: Fluctuating SNHL, vertigo
• Management: Re-exploration, prosthesis shortening, fat seal

• Foreign body reaction to prosthesis / graft material
• Presents 2–6 weeks post-op with sudden SNHL + vertigo
• HRCT: Soft tissue density at oval window
• Emergency re-exploration, granuloma removal, steroid packing

• Avascular necrosis of long process of incus from over-crimping
• Managed by incus replacement prosthesis or TORP

• Early (edema): usually resolves spontaneously
• Late (fibrosis/injury): may need grafting

• Most common cause of late failure
• Requires revision stapedectomy

• Metallic/altered taste on ipsilateral side
• Usually transient (3–6 months); permanent in <5%

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17. REVISION STAPEDECTOMY

1. Prosthesis displacement or migration
2. Fibrous adhesions around prosthesis
3. Reparative granuloma
4. Incus necrosis
5. Refixation of footplate (re-otosclerosis)
6. Prosthesis too short or too long

• Higher risk of SNHL (15–20% vs 1–2% primary)
• Requires meticulous technique
• Use of laser (KTP/CO₂) preferred
• Consider TORP/PORP if incus necrosis

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18. SPECIAL SITUATIONS

A. Obliterative Otosclerosis

• Entire footplate replaced by dense bone
• "Blue footplate" — vascular pattern visible through thinned footplate
• Technique: Diamond bur + laser to thin out footplate, then perforator
• Higher risk of SNHL, perilymph gusher

B. Perilymph Gusher (X-linked Mixed Hearing Loss / Mondini)

• Abnormal communication between CSF and perilymph
• On opening footplate: perilymph wells up profusely
• Management:
  1. Do NOT suction perilymph
  2. Pack tightly with fat
  3. Consider aborting and revising later
  4. Patient may need cochlear implant if SNHL ensues

C. Floating Footplate

• Footplate becomes mobile before complete removal
• Sinks into vestibule if improperly handled
• Management: Never suction — use hook to retrieve; pack with fat if irretrievable

D. Persistent Stapedial Artery

• Rare — runs from ICA through stapes
• Do NOT cut → severe hemorrhage
• Abandon procedure / use alternative route

E. Otosclerosis in Pregnancy

• Defer surgery until at least 3 months postpartum
• Use hearing aid during pregnancy
• Fluoride therapy may slow progression

F. Only Hearing Ear

• Relative contraindication — risk vs benefit discussion
• Patient preference critical
• Some surgeons prefer BAHA/hearing aid
• If operated: maximum safety (local anesthesia, experienced surgeon, laser stapedotomy only)

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19. MEDICAL MANAGEMENT OF OTOSCLEROSIS

Sodium Fluoride Therapy (Hazarika; Dhingra)

• Mechanism: Converts active otospongiosis → mineralized stable bone
• Dose: Sodium fluoride 40–60 mg/day (as Florical = NaF + CaCO₃)
• Indication: Active disease (Schwartze sign +), cochlear otosclerosis, contraindication to surgery
• Duration: Minimum 2 years
• Monitoring: Bone density (DEXA), serum fluoride
• Side effects: Nausea, dental fluorosis (overdose)

Bisphosphonates (Recent)

• Alendronate, pamidronate — experimental role in reducing bone turnover in otospongiotic foci

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20. RECENT ADVANCES IN STAPEDECTOMY

1. Laser Stapedotomy (Laser-Assisted)

• CO₂ laser (Lumenis, 10,600 nm): Vaporizes footplate; excellent hemostasis
• KTP laser (532 nm): Preferred for vascular otospongiotic bone
• Er:YAG laser (2940 nm): High water absorption; minimal thermal spread
• Advantages: No mechanical trauma, bloodless field, precise fenestra, reduced perilymph disturbance, lower SNHL risk
• LASER technique (Perkins, 1980; Vernick, 2007): Creates rosette of spots, then central perforation with single pulse

2. Endoscopic Stapedectomy / Stapedotomy (Endoscopic Ear Surgery — EES)

• Introduced by Tarabichi (1998), popularized by Preyer (2008)
• Single-port, 0°/45° rigid endoscope (3 mm diameter)
• Advantages:
  • Wide-angle panoramic view
  • Better illumination of oval window (angled endoscopes)
  • No need for post-auricular incision
  • Improved visualization of facial nerve, chorda tympani
  • Shorter operating time
  • Outpatient procedure
• Disadvantage: One-handed surgery (non-dominant hand holds endoscope)
• Current evidence: Equivalent results to microscopic approach (Kapadiya & Tarabichi, 2019)

3. Nitinol Self-Crimping Prosthesis

• Nitinol (Nickel-Titanium alloy) with shape memory
• Self-crimps at body temperature or with gentle warm saline
• Reduces risk of under/over-crimping
• Studies (Häusler, 2008): Comparable to manual crimping; good hearing outcomes

4. Robotic Stapedotomy

• Experimental — robotic micro-drill for precise fenestration
• RobOtol system (Lavallee et al., 2017) — tremor-free drilling
• CT-guided robotic fenestration in development
• Not yet in routine clinical use

5. Image-Guided (Computer-Aided) Stapedectomy

• Intraoperative OCT (Optical Coherence Tomography)
• Vibrometry to assess prosthesis coupling in real-time
• Still in research phase

6. Novel Prosthesis Materials

• PEEK (Polyetheretherketone) prostheses — high biocompatibility
• Titanium prostheses with curved clip (Kurz Aerial) — avoids crimping-related incus trauma
• Hydroxyapatite coupling rings

7. Fluoride + Bisphosphonate Combination Therapy

• Combined NaF + alendronate for cochlear otosclerosis — improved cochlear preservation

8. Gene Therapy (Experimental)

• OTSC1–OTSC8 loci identified
• Viral vector delivery to otic capsule — preclinical research

9. Photon Radiosurgery / Focused Ultrasound

• Experimental for otosclerotic focus ablation
• Not clinically available yet

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21. FLOWCHARTS AND SUMMARY TABLES

FLOWCHART 4: COMPLETE MANAGEMENT ALGORITHM FOR OTOSCLEROSIS

SUSPECT OTOSCLEROSIS
(Progressive bilateral CHL, normal TM, family history)
                    ↓
AUDIOLOGICAL WORKUP
  ├── PTA: CHL with ABG, Carhart's notch at 2kHz
  ├── Tympanometry: Type As
  ├── Stapedial reflexes: Absent
  └── SDS: >60%
                    ↓
CONFIRM WITH HRCT TEMPORAL BONE
  ├── Fenestral otosclerosis (oval window) → Surgical candidate
  ├── Cochlear otosclerosis → Medical (NaF) ± hearing aid
  └── Obliterative → High-risk surgery
                    ↓
IS PATIENT SURGICAL CANDIDATE?
        ↙                ↘
       YES                NO
        ↓                 ↓
STAPEDECTOMY/      Hearing aid / BAHA
STAPEDOTOMY        NaF (if active)
        ↓          
POST-OP ASSESSMENT (6-week ABG)
        ↙              ↘
ABG ≤10 dB          ABG >20 dB
(Excellent)          (Failure)
                         ↓
                  Investigate: CT temporal bone
                  Consider: Revision stapedectomy

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FLOWCHART 5: INTRAOPERATIVE DECISION MAKING

STAPES SUPERSTRUCTURE REMOVED
              ↓
      ASSESS FOOTPLATE
     ↙         ↓        ↘
NORMAL     BISCUIT    OBLITERATIVE
THICKNESS  THICK      FOOTPLATE
   ↓          ↓           ↓
STAPEDOTOMY Microdrill  Diamond bur
(perforator) + laser    carefully
   ↓          ↓           ↓
      0.6–0.8 mm FENESTRA
              ↓
    PERILYMPH VISIBLE?
       ↙          ↘
     YES           NO (gusher)
      ↓               ↓
  MEASURE           PACK TIGHTLY
  (4.25–4.75mm)     DO NOT SUCTION
      ↓             CONSIDER ABORT
  INSERT PISTON
      ↓
  CRIMP ONTO
  LONG PROCESS
  OF INCUS
      ↓
  VERIFY OSSICULAR
  CHAIN MOBILITY
      ↓
  CLOSE FLAP
  PACK EAC

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TABLE: COMPARISON OF SURGICAL APPROACHES

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TABLE: PROSTHESIS SELECTION GUIDE

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TABLE: DIFFERENTIAL DIAGNOSIS OF STAPES FIXATION

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22. VAN DER HOEVE SYNDROME

• Triad: Blue sclera + Brittle bones + Otosclerosis
• Stapedectomy possible but higher risk of scleral rupture / bone fractures
• Often combined with bisphosphonate therapy (pamidronate)

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23. RGUHS EXAMINATION HIGH-YIELD POINTS

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REFERENCES

1. Scott-Brown's Otorhinolaryngology, Head and Neck Surgery, 8th Edition, Vol. 3 — Stapes Surgery Chapter (Fisch U, Cremers CWRJ)
2. Cummings Otolaryngology — Head and Neck Surgery, 7th Edition — Chapter 145: Otosclerosis and Stapes Surgery (Hannley MT, House JW)
3. Stell & Maran's Textbook of Head and Neck Surgery and Oncology, 5th Edition — Middle Ear Surgery
4. Zakir Hussain's ENT, 3rd Edition — Otosclerosis and Stapes Surgery
5. Dhingra's Diseases of Ear, Nose and Throat, 7th Edition — pp. 94–105
6. Hazarika's Textbook of ENT and Head-Neck Surgery, 4th Edition — Otosclerosis Chapter
7. Harrison's Principles of Internal Medicine, 21st Edition — pp. 1024, 1042
8. Fisch U (1980): Stapedotomy — Small fenestra technique. Ann Otol Rhinol Laryngol
9. Shea JJ Jr (1998): Forty years of stapes surgery. Am J Otol 19:52–55
10. Kapadiya M, Tarabichi M (2019): Endoscopic stapedotomy. Otol Neurotol
11. Lavallee et al. (2017): Robotic stapedotomy — preclinical study. Otol Neurotol
12. Vernick DM (2007): Laser stapedotomy. Otolaryngol Clin N Am
13. Symons & Fanning CT grading of otosclerosis — Radiology

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Summary for RGUHS 50-Mark Question: A complete answer should cover: (1) Definition + Pathology of Otosclerosis (8 marks), (2) Clinical features + Audiological assessment including Carhart's notch (8 marks), (3) Indications/Contraindications (5 marks), (4) Surgical steps of Stapedectomy/Stapedotomy with diagrams (15 marks), (5) Intraoperative + Post-operative complications (8 marks), (6) Recent advances — Laser + Endoscopic + Nitinol prosthesis (6 marks). Flowcharts, tables, and labeled diagrams earn bonus marks in RGUHS pattern.