NBDE Examination Practice Question # 108

NBDE Examination.

Practice Question # 108.

 

nbde quiz

 

The most severe fracture of the maxilla, Le Fort III, result in craniofacial disjunction. After fracturing the nasal bones and septum, the le Fort III fracture line sequentially traverses the frontal process of the maxilla, lacrimal bone, lamina papyracea and orbital floor ( posterior to the inferior orbital fissure) before bifurcating into two distinct limbs. One of these limbs ectends across the lateral orbital wall, at the level of the sphenozygomatic junction, and often terminates by crossing the zygomatic arch.

The second limb follows a more posterior course across the posterior aspect of the body of the maxilla, crossing into the infratemporal fossa and ending by passing through the superior aspect of the pterygoid plates at the level of the basisphenoid. The main fracture line often traverses the perpendicular plate of the ethmoid bone, with a consequently greater cahance of the sustaining dural tears and cerebrospinal fluid leaks than with either the Le Fort I or II fracture patterns.

 

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