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Table 1 Association of the critical SI angle (CSIA) with signs of upper sacral dysplasia and an intraarticular vacuum phenomenon. Results were adjusted for age and sex as possible confounders. Adjusted differences between sacroiliac joints with and without the respective dysmorphic sign are presented as median with 95% confidence interval

From: Feasibility of iliosacral screw placement in patients with upper sacral dysplasia

Signs of upper sacral dysplasiaCritical SI angle
Mammillary bodiesNo
n = 152
Yes
n = 39
−10.4°
(−15.6° to −5.2°); p < 0.001
Tongue−in−grooveNo
n = 178
Yes
n = 13
3.4°
(−5.4° to 12.2°); p = 0.447
Intervertebral discNo
n = 42
Yes
n = 149
−3.5°
(−8.8° to 1.8°); p = 0.193
CollinearityNo
n = 184
Yes
n = 7
−8.9°
(−20.5° to 2.6°); p = 0.129
Unspherical neuroforaminaNo
n = 123
Yes
n = 68
−0.7°
(−5.4° to 4.0°); p = 0.769
Intraarticular vacuum phenomenonNo
n = 108
Yes
n = 71
−6.8°
(−11.3° to 2.4°); p = 0.003
  1. Data in bold signifies p-value <0.05.