Classification
Rotatory subluxation is classifed into four types depending upon the degree of separation of the dens from the anterior arch of atlas:
Type I : Atlanto-dens distance <3 mm; transverse ligament intact
Type II: Atlanto-dens distance 3–5 mm; transverse ligament ruptured
Type III: Atlanto-dens distance >5 mm; alar ligaments ruptured
Type IV: Posterior subluxations of C1 on C2 (usually signifies an odontoid fracture or hypoplasia)
Explanation
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Figures
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Reference(s)
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Last Updated on June 27, 2024
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