question: Atlanto-axial rotary instability (Fielding type 1) is common to what diseases?
answer: Atlanto-axial instability (AAI) is common in the connective tissue disorders, such as rheumatoid arthritis, and increasingly recognized in the heritable disorders of Stickler, Loeys-Dietz, Marfan, Morquio, and Ehlers-Danlos (EDS) syndromes as well as infectious disease.