Table 2

MRI analysis of the patients with spondyloarthritis (SpA) and controls by heel

SpA heels without pain (N=57)SpA heels with history of pain (N=18)SpA heels with pain (N=21)Controls (N=48)
N (%)N (%)N (%)N (%)
Achilles tendon
 Tendon thickening >5.29 mm3 (5.26)4 (22.22)2 (9.52)10 (20.83)
 Insertion thickening, mean (SD)4.50 (0.79)4.50 (0.66)4.69 (0.91)5.38 (1.05)
 Insertion/tendon ratio, mean (SD)1.09 (0.19)1.01 (0.16)1.09 (0.20)1.14 (0.14)
 Abnormal intratendinous signal7 (12.28)7 (38.89)2 (9.52)10 (20.83)
 Achilles tendon hypersignal5 (8.77)6 (33.33)3 (14.29)6 (12.50)
 Calcification3 (5.26)0 (0.00)0 (0.00)0 (0.00)
 Bone erosion2 (3.51)3 (16.67)2 (9.52)3 (6.25)
 Enthesophyte13 (22.81)4 (22.22)0 (0.00)8 (16.67)
 Posterior calcaneus bone oedema (>0)0 (0.00)3 (16.67)1 (4.76)2 (4.17)
 Oedema measurement, mean (SD)0.00 (0.00)1.56 (3.73)1.57 (7.20)0.33 (1.63)
 Preachillean bursitis4 (7.02)4 (22.22)4 (19.05)2 (4.17)
Plantar aponeurosis
 Aponeurosis thickening >4.4 mm0 (0.00)0 (0.00)2 (9.52)1 (2.08)
 Insertion thickening, mean (SD)3.05 (0.66)3.00 (0.42)3.79 (1.37)3.41 (0.94)
 Insertion/tendon ratio, mean (SD)1.32 (0.33)1.19 (0.28)1.46 (0.29)1.38 (0.38)
 Abnormal aponeurosis signal13 (22.81)5 (27.78)14 (66.67)20 (41.67)
 Peri-aponeurosis signal12 (21.05)6 (33.33)15 (71.43)17 (35.42)
 Calcification0 (0.00)0 (0.00)0 (0.00)0 (0.00)
 Bone erosion1 (1.75)2 (11.11)0 (0.00)3 (6.25)
 Enthesophyte8 (14.04)4 (22.22)8 (38.10)15 (31.25)
 Inferior calcaneus bone oedema6 (10.53)5 (27.78)7 (33.33)2 (4.17)
 Oedema measurement, mean (SD)0.60 (1.88)1.72 (3.80)3.48 (5.59)0.23 (1.12)
 Oedema6 (10.53)8 (44.44)8 (38.10)3 (6.25)
 Any sign30 (52.63)12 (66.67)17 (80.95)32 (66.67)
  • Data shown are n (%) or mean (SD).

  • Data in italics indicate significant p value (p<0.005) by the non-parametric Wilcoxon test.