Table 1

Number of inflammatory cervical spine changes in radiographs of the 65 patients, shown in separate PsA patterns

DisorderOligoarthritis (n=11)Axial disease (n=12)Polyarthritis (n=42)All No (%)
*Sakaguchi-Kauppi method, grades II–IV.6
Anterior atlantoaxial subluxation (>3 mm, aAAS)145 (8)
Posterior atlantoaxial subluxation0
Atlantoaxial impaction (AAI)*213 (5)
Apophysial joint ankylosis1337 (11)
Subaxial subluxation (>3 mm)112 (3)
aAAS+AAI112 (3)