Developmental Abnormalities – Cleft Lip & Palate Comprehensive Study Notes

Surgical Management of Developmental Cranio-Facial Abnormalities (General Context)

  • Indications for surgical intervention in older children

    • Maintain airway; e.g. severe retrognathia threatening breathing ➔ consider mandibular advancement.
    • Goal: avoid tracheostomy or enable early decannulation.
    • Preferred technique: distraction osteogenesis (a.k.a. distraction histogenesis).
    • Principle identical to limb lengthening.
    • Steps
      • Complete osteotomy (full-thickness bone cut in mandible; cortical-only cut not required as in long bones).
      • Latent period before activation.
      • Gradual separation of bone ends at ≈ 1\,\text{mm day^{-1}}.
      • Retention phase: allow callus mineralisation/consolidation.

  • Craniosynostosis

    • Definition: premature closure of ≥1 cranial sutures.
    • Isolated vs. syndromic cases.
    • Complications
    • Raised intracranial pressure (ICP) in 10–20%10\text{–}20\% of single-suture cases; higher in multisuture syndromes.
    • Clinical signs: distress spells, listlessness, disturbed sleep, papilloedema ➔ risk of visual loss.
    • Diagnosis: ICP monitoring.
    • Ocular obstruction risks (e.g. giant haemangioma of eyelid) ➔ treat early to prevent amblyopia.

Psychosocial & Functional Management by Age

Early Childhood (1–12 years)

  • Priorities
    • Resolve function: airway, speech, feeding.
    • Growing need to address appearance.
    • Psychological support for child, family, sometimes school community.
    • Surgery best deferred if possible to maximise late growth results.
  • Obstructive sleep apnoea (OSA)
    • Presentation subtle; parents may normalise snoring/day-tiredness.
    • Investigations: home overnight SpO2_2 → formal sleep study if abnormal.
    • Treatments: tonsillectomy/adenoidectomy, midface advancement, mandibular distraction, CPAP/BiPAP, etc.

Late Childhood → Maturity

  • Functional issues usually stabilised.
  • Emphasis on optimising appearance, often timed around transition to secondary school.
  • Corrective surgery ideally after skeletal maturity; produce integrated skeletal–dental → soft-tissue plan within MDT.

Cleft Lip & Palate (CLP)

Introduction & Incidence

  • Most common congenital orofacial anomaly.
  • Occurs isolated or syndromic (> 300300 syndromes).
  • Global incidence ≈ 1:6001:600 live births.
    • Higher among South-East Asian & Native American groups.
  • Sex distribution
    • CL ± P more common in males.
    • Isolated cleft palate (CP) more common in females.
  • Typical pattern
    • Cleft lip alone: 15%15\%
    • Cleft lip + palate: 45%45\%
    • Isolated cleft palate: 40%40\%

Classification Systems

  • Two broad phenotypes
    1. Isolated cleft palate.
    2. Cleft lip with/without alveolar and/or palatal involvement.
  • Details captured by extent & laterality (left/right/bilateral).
  • Examples
    • LAHSHAL code (Figure 50.2a).
    • Veau classes I–IV (Figure 50.2b):
    • I – soft palate only;
    • II – soft + hard palate to incisive foramen;
    • III – complete unilateral (lip, alveolus, palate);
    • IV – complete bilateral.

Aetiology

  • Multifactorial: polygenic + environmental.
  • Genetic
    • Risk increases with first-degree relative affected.
    • Over 150150 named syndromes: Stickler, DiGeorge, Down, Apert, Treacher Collins most common.
    • Isolated CP has highest syndromic association.
  • Environmental teratogens
    • Maternal epilepsy & anti-epileptic drugs (steroids, diazepam, sodium valproate, phenytoin).
    • Role of folic acid supplementation remains unclear for CLP.
  • Pierre Robin sequence (isolated CP + micrognathia + glossoptosis)
    • Leads to airway/feeding difficulty; may need nasopharyngeal airway, oxygen, tracheostomy, rarely labioglossopexy or mandibular distraction (evidence inconclusive).

Embryology & Pathogenesis

  • Lip & nose complex: median nasal + maxillary processes.
  • Primary palate (anterior to incisive foramen): median nasal process ➔ alveolus, philtrum.
  • Secondary palate (posterior): maxillary processes ➔ hard + soft palate.
  • Failure of fusion/rotation/descent of palatal shelves ➔ cleft.

Clinical Anatomy & Deformity Characteristics

  • Facial muscle chains (Fig 50.3): nasolabial, bilabial, labiomental.
  • Unilateral CL
    • Disruption of one side → asymmetry, nasal septum deviation, skin misplacement over lip, vermilion distortion.
  • Bilateral CL
    • Bilateral muscular discontinuity ➔ nasal flaring, protrusive premaxilla, midline prolabium without muscle.
  • Cleft palate specifics
    • Soft palate: levator veli palatini fibres abnormally oriented antero-posteriorly inserting on posterior hard palate edge.
    • Hard palate: three mucosal zones—palatal, maxillary, gingival; median fibromucosa thin and missing in complete cleft.

Multidisciplinary Team (MDT) & Care Pathway

  • Core members
    • Coordinator/administrator, Clinical Nurse Specialist (CNS), Paediatrician, Speech & Language Therapist (SLT), ENT/Audiology, Paediatric Dentist, Orthodontist, Clinical Psychologist, Cleft Surgeon.
  • Antenatal diagnosis
    • Lip clefts detectable on ∼20\sim20-week anomaly scan; isolated CP usually not seen.
  • CNS leads neonatal feeding, airway assessment, family counselling.

Neonatal/Immediate Care

  • Feeding challenges with palatal involvement
    • Aim: efficient milk transfer, reduce effort.
    • Options: expressed breast milk, soft-squeeze bottles, modified teats.
    • Historical: feeding plates; some centres still perform naso-alveolar moulding (NAM); long-term benefit controversial.
  • Airway
    • Monitor for obstructive events especially in Pierre Robin sequence.

Principles & Timing of Primary Cleft Surgery (UK/Nordic Protocol)

  • Fundamental aim: recreate normal anatomy, especially muscular rings ➔ promotes normal function & growth.
  • No true tissue hypoplasia (except rare holoprosencephaly); mostly displacement/deformation.

Stage 1 – Lip/Nose & Anterior Palate (3–6 months)

  • Vomerine mucosal flap for anterior palate.
  • Multiple named skin incisions; muscle repair prioritised > scar line.

Stage 2 – Definitive Palate Repair (6–12 months)

  • Intravelar veloplasty (IVVP)
    • Incisions along cleft margin.
    • Mobilise levator veli palatini → re-approximate in midline forming sling (Fig 50.8).
  • Rationale: performed before critical speech development phase.

Early Years Follow-Up (1–7 years)

  • Hearing
    • Cleft palate children prone to otitis media with effusion (OME) via Eustachian tube dysfunction.
    • Regular audiology; grommets if indicated.
  • Speech
    • Continuous SLT monitoring.
    • Issues
    1. Velopharyngeal incompetence (VPI): hypernasality, nasal air escape.
    2. Articulation errors (compensatory or dental).
    • Diagnostics: videofluoroscopy, nasendoscopy.
    • Interventions: secondary palate revision or pharyngoplasty.
  • Dental health
    • High rates of hypodontia/hyperdontia near cleft, delayed eruption.
    • Emphasis on prevention: fluoride, fissure sealants, diet advice.
  • Wound/Aesthetic review
    • Lip revisions timed pre-school or combined with later bone grafting.

Late Childhood Care (7–12 years)

Secondary Alveolar Bone Grafting (ABG)

  • Purpose
    • Restore alveolar continuity; support tooth eruption; stabilise premaxilla in bilateral cases; close fistula.
  • Timing
    • Early secondary: 5–75\text{–}7 y (around lateral incisor root 1/21/2–2/32/3 formed).
    • Late secondary: 8–118\text{–}11 y (canine root 1/21/2–2/32/3 formed).
    • Determined individually via radiographs.
  • Technique often preceded by short orthodontic expansion (< 50%50\% of unilateral cases).

Orthodontics

  • Two phases
    1. Mixed dentition (8–10 y): expand arch, prepare for ABG.
    2. Permanent dentition (12–18 y): final alignment, possibly pre-orthognathic preparation.

Secondary / Revision Procedures

  • Lip/Nasal Revision

    • Lip: misaligned vermilion, asymmetry.
    • Nasal: alar base malposition, tip projection deficient, septal deviation into non-cleft side.
    • Minor revisions possible < 1414–1515 y; definitive open septorhinoplasty after facial growth.
    • Techniques: reposition lower lateral cartilage, septal/conchal grafts.

  • Speech Surgery

    • For persistent VPI despite therapy: pharyngeal flap, sphincter pharyngoplasty, palate re-lengthening, etc.

  • Orthognathic Surgery

    • Indications: maxillary hypoplasia (horizontal & vertical insufficiency) → Class III malocclusion, concave profile.
    • Timing: skeletal maturity (♀ ≈16\approx16–1717 y; ♂ ≈17\approx17–1919 y).
    • Procedures: Le Fort I maxillary advancement ± mandibular/genic surgeries (bimaxillary as required).

Ethical, Psychological & Social Considerations

  • Visible difference impacts self-esteem, social integration, school performance.
  • MDT integrates clinical psychology from diagnosis through adulthood.
  • Surgery timing must balance growth optimisation with psychosocial needs (e.g. secondary school transition stress).
  • Parental counselling & educational outreach mitigate misconceptions.

Outcome Measurement & Audit

  • National audits (e.g. UK UCLP dataset) compare centres.
  • Key metrics: speech intelligibility, occlusion class, facial growth (cephalometry), aesthetic rating, quality-of-life questionnaires.

Key Numerical / Statistical References

  • Incidence: 1:6001:600 live births.
  • CL alone 15%15\%; CL + P 45%45\%; CP alone 40%40\%.
  • Unilateral CLP left-sided in 60%60\% of cases.
  • Raised ICP in craniosynostosis: 10–20%10\text{–}20\% single-suture.
  • Distraction rate: 1\,\text{mm day^{-1}}.

Historical & Eponymous Notes

  • Victor Veau classification (1871–1949).
  • Gunnar Stickler syndrome; Angelo DiGeorge; John Langdon Down.
  • Pierre Robin sequence (1930 description).
  • Christian Doppler principle (basis for proposed isolated CP antenatal Doppler diagnosis).
  • Bartolomeo Eustachio: Eustachian tube namesake.

Summary / Take-Home Messages

  • Management of CLP is multidisciplinary, longitudinal, and outcome-driven.
  • Primary surgical goals: anatomic reconstruction of muscle and mucosa (lip, nose, palate) within optimal developmental windows.
  • Early years focus on hearing, speech, dental health; adolescence introduces bone grafting, orthodontics, and eventual orthognathic/nasal refinement.
  • Psychosocial support is integral, not optional.
  • Evidence-based protocols, national audits, and continuing research aim to further improve functional and aesthetic outcomes.