Frontal Sinus Fractures web version - Wisdom Teethmaxillofacialsurgeons.org/lectures/Frontal Sinus...

Frontal Sinus FracturesFrontal Sinus FracturesPeter Aquilina

MBBS(Hons) MS(Head & Neck) BDS(Hons) FRACDS(OMS) Consultant Maxillofacial Surgeon

W t d & R l Child ' H it lWestmead & Royal Children's HospitalsSenior Lecturer University of Sydney

www maxillofacialsurgeons orgwww.maxillofacialsurgeons.org

Anatomy & EmbryologyAnatomy & Embryology• Absent at birth• Doesn’t begin development until about 2 years

of age• Radiographically evident at about 8 years• Radiographically evident at about 8 years• Adult size at about 12 years, but pneumatization

continues slowly until about 40 yearsy y• Consists of one or more compartments• Irregular shape & asymmetric

Li d b i i h li• Lined by respiratory epithelium• Intimate relation with cranial cavity and orbits

AnatomyAnatomy • Volume approx 5 mlsVolume approx 5 mls• Anterior wall thicker/stronger than posterior wall• Dura adheres to deep surface of posterior tableDura adheres to deep surface of posterior table• Mucosal lining contiguous with ethmoidal air

cells & nasofrontal ductscells & nasofrontal ducts• Foramina of Breschet venous drainage of

mucosa are site of potential intracaranial spread ucosa a e s te o pote t a t aca a a sp eadof infection

• Mucosa deeply invaginates foraminap y g

Anatomical VariationAnatomical Variation

• 10% unilateral10% unilateral• 5% rudimentary

4% b t• 4% absent• 20% of people “abnormal” frontal sinus

anatomy

Nasofrontal DuctNasofrontal Duct

• Drains frontal sinusDrains frontal sinus• Located posteromedial floor of sinus

V i bl• Very variable course• True duct is absent in 85% people

– FS drains indirectly via ethmoidal air cells to middle meatus

ExaminationExamination

• Full assement as per ATLSFull assement as per ATLS• Lacerations

D i• Depression• CSF leak

Dr. Peter Aquilina©q

InvestigationsInvestigations

• CT imaging modality of choiceCT imaging modality of choice– Request axial and coronal slices

Beta Transferrin CSF• Beta Transferrin CSF• Other investigations as requireds as

medically indicated

Dr. Peter Aquilina© Dr. Peter Aquilina©

Dr. Peter Aquilina©

Associated injuriesAssociated injuries

• NeurologicalNeurological– Closed head injury

Pneumocephalus– Pneumocephalus– Cerebral contusions

Haematomas– Haematomas– Open brain

Associated injuriesAssociated injuries

• OpthalmologicalOpthalmological– Up to 25%

Full opthalmological examination mandatory– Full opthalmological examination mandatory

Associated injuriesAssociated injuries• Maxillofacial injuriesMaxillofacial injuries

– NOEZMC– ZMC

– Le Fort fracturesPanfacial fractures– Panfacial fractures

Classification of Frontal Sinus FFractures

• Many classification systemsMany classification systems• Can get very detailed classification,

however not useful clinicallyhowever not useful clinically

Clinical ClassificationClinical Classification• Anterior Table

– Displaced– Un-displaced

• Posterior TablePosterior Table– Displaced– Un-displaced

• Anterior & Posterior Table• Anterior & Posterior Table– Displaced– Un-displaced

• Nasofrontal Duct– Involved– uninvolved

Simplified Clinical ClassificationSimplified Clinical Classification

1. Fracture of anterior table

2. Fracture with disruption of posterior wall

3. Fracture involving floor of sinus

Surgical Management

G l “S f Si ”Goal = “Safe Sinus”

Anterior Table FracturesAnterior Table Fractures

• Non surgicalNon surgical– Undisplaced

Minimal displacement with no cosmetic defect– Minimal displacement with no cosmetic defect• Surgical Intervention

f– Displaced fractures

Anterior Table FracturesSurgical Access

• Coronal flap preferableG ll id i l ti l l• Generally avoid using lacerations or local incisions

• Avoid “Gull Wing” & “Open Sky” approaches

• Anatomically reduce fragments & hold in place with 1.3mm hardwarep

Anterior Table with Bone LossAnterior Table with Bone Loss

D P t A iliDr. Peter Aquilina©

Frontal Sinus with Orbital RoofFrontal Sinus with Orbital Roof

Fractures with Disruption of the P i T blPosterior Table

• Non-Surgical managementNon Surgical management– Undisplaced fractures

• Surgical ManagementSurgical Management– Displaced fractures

• Displacement more than thickness of posterior p ptable

– Clinical findings suggestive of significant dural teartear

• Encephalocoele• Persistent CSF leakPersistent CSF leak

Surgical Management of Posterior T bl FTable Fractures

CranializationVs

ObliterationObliteration

• Frontonasal ducts obliterated mucosalFrontonasal ducts obliterated, mucosal lining removed and sinus “packed”

• Various materials advocated• Various materials advocated– Fat

M l– Muscle– Bone– Hydroxyapatite

CranializationCranialization

• Frontal craniotomyFrontal craniotomy• Dural repair

R l f t i ll• Removal of posterior wall• Removal of mucosal lining• Plugging of nasofrontal ducts• Galeal flap placedGaleal flap placed

Fracture of the Floor of the Frontal SiSinus

• Unusual in isolationUnusual in isolation• Usually associated with NOE fractures• ? Treat isolated floor fracture to prevent• ? Treat isolated floor fracture to prevent

mucocoele formation• If isolated floor fracture & sinus clinically• If isolated floor fracture & sinus clinically

draining satisfactorily may opt to leave alonealone

• Accurate reduction of fractures can expect NFD function to resume (Gruss)expect NFD function to resume (Gruss)

Management of the Nasofrontal DDuct

• Role of drainage via nasofrontal duct may beRole of drainage via nasofrontal duct may be overstated in trauma compared to infective sinusitis (Evans)

• Avoid trying to restablish a frontonasal duct prone to failure

• If radiological evidence of NFD disruption, explore and treat on merits

• NFD function most likely to return to normal with accurate anatomical fracture reduction.

CSF LEAKCSF LEAK

• Management controversialManagement controversial• Surgical or non-surgical

P h l ti tibi ti ?• Prophylactic antibiotics?

Prophylactic AntibioticsProphylactic Antibiotics

• incidence of meningitis between 3-50%incidence of meningitis between 3 50%• Mortality about 10%

U ll• Usually pnuemococcus spp.

Prophylactic AntibioticsProphylactic Antibiotics

• EBMEBM– Prophylactic antibiotics not recommended

Prophylactic antibiotics may increase– Prophylactic antibiotics may increase incidence of menigitis by changing the pathogenicity of the nasopharygeal florapathogenicity of the nasopharygeal flora

Managing CSF leakManaging CSF leak

• Fracture reduction often stops leakFracture reduction often stops leak• Most traumatic leaks close spontaneously

L k 72 h l b d i• Leak > 72 hrs lumbar drain• Surgical repair

– Endoscopic– intracranial

Frontal Sinus Fractures web version - Wisdom Teethmaxillofacialsurgeons.org/lectures/Frontal Sinus...

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