Abstract A patient with Down's syndrome and asymptomatic atlanto-occipital instability is described. The relationship between atlanto-occipital instability, atlanto-axial instability and generalized ligamentous laxity, is discussed. [ncbi.nlm.nih.gov]

The relationship between atlanto-occipital instability, atlanto-axial instability and generalized ligamentous laxity, is discussed. [ncbi.nlm.nih.gov]

It is proposed that the Type I odontoid fracture is a likely manifestation of atlanto-occipital instability and rarely occurs as an isolated or stable injury. [ncbi.nlm.nih.gov]