Background: Achondroplasia is the commonest form of human dwarfism. The authors report atlanto-axial instability, in consequence to os odontoideum in this subgroup of patients.
Methods: Two achondroplastic dwarfs harboring atlanto-axial dislocation are described along with radiological findings.
Results: Both children underwent successful internal rigid immobilization, using sublaminar atlanto-axial wiring.
Conclusions: Craniovertebral junction instability should be evaluated among these children, whenever foramen magnum insufficiency is being considered.
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