@entity2694 is a common symptom accompanying @entity8924 . The pathomechanism is still not recognized and the usually assumed cause, elevated pressure in the upper airways connected with sneezing or coughing, does not always contribute to the occurrence of this type of @entity174 . Observations based on the finite model (simulating @entity174 ) of the deformations of the inferior orbital wall after a strike in its lower rim. Authors created a computer numeric model of the orbit with specified features-thickness and resilience modulus. During simulation an evenly spread 14400   N force was applied to the nodular points in the inferior rim (the maximal value not causing cracking of the outer rim, but only ruptures in the inferior wall). The observation was made from 1    10(-3) to 1    10(-2) second after a strike. Right after a strike dislocations of the inferior orbital wall toward the maxillary sinus were observed. Afterwards a retrograde wave of the dislocation of the inferior wall toward the orbit was noticed. Overall dislocation amplitude reached about 6   mm. Based on a numeric model of the orbit submitted to a strike in the inferior wall an existence of a retrograde shock wave causing @entity2694 has been found.

XXXX : a numerical model.

@entity2694 :: ('MESH:D009916', 'Disease') :: ['orbital emphysema', 'Orbital emphysema'] @entity174 :: ('MESH:D050723', 'Disease') :: ['fracture', 'blowout type fracture'] @entity8924 :: ('MESH:D009917', 'Disease') :: ['orbital fracture']
@entity2694 :: (MESH:D009916,Disease) :: ['Posttraumatic orbital emphysema']
