Table 4

Axial radiographic pattern and morphology in PsSpA (n=118) and AS (n=157) cases

 PsSpAASAS versus PsSpA
n (%)n (%)OR95% CIp Value
Pattern
Radiographic
 Sacroiliitis79 (67)157 (100)
 Spondylitis (cervical and/or lumbar)84 (71)109 (69)0.940.52 to 1.690.83
Sacroiliitis pattern
 Bilateral65/79 (82)142/147 (97)6.142.08 to 18.150.001
 Symmetrical grade60/79 (76)119/147 (81)1.170.59 to 2.320.65
Spondylitis pattern
 Cervical vertebrae52/116 (45)85 (54)1.200.65 to 2.250.56
 Cervical facet joint29 (25)60 (38)1.480.81 to 2.720.20
 Lumbar vertebrae50/117 (43)85 (54)1.370.75 to 2.500.30
Morphology
Sacroiliac joint
 Sclerosis bilaterally (grade 2)6 (5)9 (6)1.750.56 to 5.480.34
 Erosion (grade 3)42 (36)53 (34)1.070.63 to 1.810.80
 Partial ankylosis (grade 3)25 (21)46 (29)1.080.56 to 2.100.81
 Complete ankylosis (grade 4)18 (15)68 (43)2.961.42 to 6.150.004
Vertebral
 Erosion, n (%)3 (3)6 (4)1.580.38 to 6.570.53
 Non-bridging syndesmophyte47 (40)58 (37)0.930.57 to 1.560.79
 Bridging syndesmophyte12 (10)36 (23)2.781.49 to 5.180.001
  • *Multivariate reverse-stepwise logistic regression model (adjusted as required for the following potential covariates: sex, age at radiographic assessment, disease duration at radiographic assessment, HLA-B*27 status, anti-TNF use ever, synthetic DMARD use ever, smoking and BMI).

  • Anti-TNF, antitumour necrosis factor; AS, ankylosing spondylitis; BMI, body mass index; DMARD, disease modifying antirheumatic drug; PsSpA, psoriatic spondyloarthritis.