A patient with psoriatic arthropathy developed atlantoaxial subluxation and neurologic symptoms. This potentially serious complication has not been well documented in this disease. Signs and symptoms can include neck pain, back pain which may radiate into the legs, syncope, and neurologic deficit. The diagnosis is confirmed by the demonstration of a distance greater than 3 mm between the atlas and odontoid process on flexion roentgenograms of the neck.
Giuliano VJ, Scully TJ. Atlantoaxial Subluxation in Psoriatic Arthropathy. Arch Dermatol. 1972;105(2):247–248. doi:10.1001/archderm.1972.01620050057012
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