In this method, two lines were drawn. The first line connects the basion to the midpoint on the C2
spinolaminar line (the anterior aspect of the posterior ring of C2) (B-C2SL). The second line connects the opisthion to the posteroinferior
edge of the body of C2 (OC2).
first line (B-C2SL) should pass across the superior posterior aspect of
the dens (tangentially intersecting it). The second line (OC2) should
pass just anterior to the posterior ring of C1 (tangentially
intersecting the highest edge of the C1 spinolaminar line).
Atlantooccipital dislocation is diagnosed if both lines are displaced.
Lee C, Woodring JH, Goldstein SJ,
Daniel TL, Young AB, Tibbs PA.
Evaluation of traumatic atlantooccipital dislocations. AJNR Am J
Neuroradiol. 1987 Jan-Feb;8(1):19-26.
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