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Orbital fracturesw
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- 3. Topics for Discussion • Orbital anatomy • Types of fractures • Signs and symptoms • Management 3
- 4. Orbital Anatomy • Thebony orbit refers to the shell of bone which surrounds and protects the eye. • The bony orbit is a pyramidal cavity with an elliptical base presenting anteriorly and the apex posteriorly 4
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- 6. Bony Orbit • Sevenbones form the bony orbit – Maxilla – Zygoma – Lacrimal – Ethmoid – Palantine – Sphenoid – Frontal 6
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- 8. Superior Orbital Wall •Formed by: – Frontal bone – Lesser wing of sphenoid • Functions as: – Floor anterior fossa • Important structures: – Supraorbital notch which transmits the supraorbital nerve 8
- 9. Medial Orbital Wall •Formed by (from anterior to posterior): – Maxilla – Lacrimal bone – Ethmoid – Sphenoid • Important structures: – Lamina papyracea 9
- 10. Lamina Papyracea • Thinsegment of the medial orbital wall • Separates the orbit from the ethmoid air cells 10
- 11. Lateral Orbital Wall •Formed by: – Zygomatic bone – Greater wing of sphenoid 11
- 12. Orbital Floor • Formedby: – Maxilla – Palatine • Important structures: – Infraorbital groove • Transverses floor from lateral to medial • Location of infraorbital nerve which supplies sensation to check and ipsilateral upper alveolus and teeth 12
- 13. Orbital Floor • Formsroof of maxillary sinus • Location of more blow out fractures due to inherent weakness of bone overlying maxillary sinus 13
- 14. Three important aperturesat the apex of bony orbit • Optic canal • Superior orbital fissure • Inferior orbital fissure 14
- 15. Optic Canal • Contains: – Optic nerve – Ophthalmic artery • In Lesser wing of sphenoid 15
- 16. Superior Orbital Fissure •Separates lateral wall from roof • Transmits the following structures: – Oculomotor nerve (CN III) – Trochlear nerve (CN IV) – Abducens nerve (CN VI) – Ophthalmic division of trigeminal nerve • Lacrimal, frontal and nasociliary Branches – Ophthalmic vein – Sympathetics from cavernous sinus 16
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- 19. Clinical Correlation • Superior orbital fissure syndrome – Ptosis – External Ophthalmoplegia ( III, IV &VI ) – Anaesthesia of cornea (Nasociliary) – Ipsilateral Numbness forehead, lateral orbital skin • Orbital Apex Syndrome – All of the above – Visual Loss 19
- 20. Inferior orbital Fissure • Connects to pterygopalantine fossa • Located between floor and lateral wall • Transmits: – Maxillary division Trigeminal nerve – Infra orbital Artery – Zygomatic Nerve – Sphenopalatine Ganglion Branches – Ophthalmic Vein Branches 20
- 21. Blowout Fractures ofOrbit • Originally defined as orbital floor fractures without fracture orbital rim, but with entrapment one or more soft tissue structures 21
- 22. Blowout Fractures • Blowoutfractures now refer to fractures of the: – Orbital floor – Medial wall – Lateral wall – Superior wall • “pure” blowout fractures – trapdoor rotation to bone fragments involving central area of bone • “impure” fracture – fracture line extends to orbital rim 22
- 23. Physiology of BlowoutFracture • The bony defect is filled with soft tissue and fat from the orbit • Alters support mechanisms for EOM • EOM can become entrapped • Direct muscle damage can result 23
- 24. Common causes oforbital fractures • Falling • Aggression • Sporting events • MVAs 24
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- 27. Initial Evaluation • History – Time and mechanism of injury – Change in appearance of eye – State of vision immediately after injury • Immediate loss of vision – severe damage to retina • Loss of light perception - vascular occlusion or optic nerve compression • Initial good vision – compression optic neuropathy 27
- 28. Initial Evaluation • PhysicalExam – Cranial nerve examination • EOM • Numbness check – Palpation orbital rim – Papillary function – Visual acuity – Fundus examine – Ophthalmologic evaluation 28
- 29. Visual Acuity • Lightperception • Finger counting • Visual acuity 29
- 30. Consultation Do not hesitateto obtain an ophthalmologic consultation 30
- 31. Common physical signs • Periorbital eccyhmosis • Impaired extraocular muscles • Hypoesthesia in V2 distribution • Intraorbital emphysema 31
- 32. Common Symptoms • Diplopia •Pain with eye movement 32
- 33. Radiographic Evaluation • CTscan of the orbits • Plain films not useful due to a high rate of false negatives and non-diagnostic studies 33
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- 37. Injuries associated withblow out fractures • Ruptured globe • Retroorbital hemorrhage • Vitreous hemorrhage • Hyphema • Dislocated lens • Secondary glaucoma • Retinal detachment 37
- 38. Treatment Options • Nonsurgical •Surgical 38
- 39. Initial Management • ABC • C-Spine • Analgesia • Nurse Head up • Ice affected area • Broad spectrum antibiotics • Steroids • No nose blowing 39
- 40. Indications for Surgery •Retrobulbar haematoma • Diplopia • Enophthalmos >2 mm • Substantial soft tissue herniation into maxillary sinus • Displaced fracture esp if palpable step at rim 40
- 41. Contraindications to surgery • Hyphema • Retinal detachment • Globe perforation • Only seeing eye • Medically unstable patient 41
- 42. Surgical Approaches • Transconjunctivalapproach • Transcutaneous • Subciliary 42
- 43. Factors to considerfor surgery • Site • Location • Severity • What needs to be corrected 43
- 44. Orbital Implants • Useof implants based on degree of comminution and size of fracture • Various implant material used – Autogenous bone and cartilage – Alloplastic material • Teflon • Marlex • PDS 44
- 45. Complications of Surgery • Ectropion • Lid retraction • Persistent diplopia • Malposition of eye • Hypoaesthesia of V2 • Extrusion of orbital floor implant • BLINDNESS 45
Editor's Notes
- #46 Ectropion – turing outward eyelid