Table 2

BME and structural lesions on MRI-sacroiliac joint of patients from the Devenir des Spondyloarthropathies Indifférenciées Récentes cohort over 5 years of follow-up

Baseline mean (SD) (n=150)*2 years’ mean (SD) (n=136)5 years’ mean (SD) (n=150)*Change over 5 years’ mean (SD)P value†
BME lesions (scores)
Mean SPARCC score‡ (0–72) 3.8 (7.2)2.8 (5.8)2.4 (4.7)−1.4 (6.5)0.009
Structural lesions (scores)
Mean number of erosions‡ (0–40)1.0 (1.9)1.1 (2.0)1.2 (2.1)0.2 (1.4)0.085
Mean number of fatty lesions‡
(0–40)		 1.1 (2.6)1.7 (4.0)1.9 (4.1)0.8 (2.2)<0.001
Mean number of fatty lesions and/or erosions‡
(0–80)		 2.1 (3.9)2.8 (5.0)3.1 (5.1)1.0 (2.6)<0.001
Mean total number of lesions‡§
(0–144)		 2.6 (4.5)3.3 (6.2)3.9 (6.5)1.3 (3.1)<0.001
 Baseline
n (%)
(n=150)*		2 years
n (%) (n=136)		5 years
n (%)
(n=150)*		Positive change over 5 years
n (%)		Negative change over 5 years
n (%)		Net change
n (%)
BME lesions (cut-off)
ASAS definition*44 (29.3)30 (22.1)32 (22.0)10 (6.7)21 (14.0)−11 (−7.3)
 Baseline
n (%)		2 years
n (%) (n=136)		5 years
n (%)		Positive change over 5 years
n (%)		Negative change over 5 years
n (%)		Net change
n (%)
Structural lesions (cut-offs)
≥3 erosions¶20 (13.3)21 (15.4)21 (13.9)8 (5.3)7 (4.6)1 (0.7)
≥3 fatty lesions¶20 (13.3)26 (19.1)32 (21.2)12 (8.0)0 (0.0)12 (8.0)
≥5 fatty lesions and/or erosions¶23 (15.2)32 (23.5)33 (21.9)12 (8.0)2 (1.3)10 (6.6)

  • *Missing MRI short tau inversion recovery sequence in one case at 5 years.

  • †Paired samples t-test comparing baseline versus 5 years.

  • ‡Mean of three readers.

  • §Fatty lesions, erosions, sclerosis and partial ankylosis/total ankylosis.

  • ¶Agreement of ≥2 out of 3 readers.

  • ASAS, Assessment of Spondyloarthritis International Society; BME, bone marrow oedema; SPARCC, Spondyloarthritis Research Consortium of Canada.