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Table 1 Age and gender distribution of intersegmental fusion S1- S3, ossified nuclei, and joint facet defects

From: Anatomy of the sacroiliac joints in children and adolescents by computed tomography

Age, years <12 12- < 13 13- < 14 14- < 15 15- < 16 16- < 17 17- < 18
Number of persons Girls Boys Girls Boys Girls Boys Girls Boys Girls Boys Girls Boys Girls Boys
n = 27 n = 27 n = 3 n = 7 n = 6 n = 7 n = 8 n = 8 n = 4 n = 7 n = 4 n = 3 n = 6 n = 8
S1/S2 fusion: no 20 17 0 1 0 3 0 1 0 0 0 0 0 0
 partial 6a 10b 3 6 2 4 3 7 2 4 0 1 1 4
 complete 1c 0 0 0 4 0 5 0 2 3 4 2 5 4
S2/S3 fusion: no 20 24 0 1 1 2 1 2 0 0 0 0 0 1
 partial 7d 3e 3 6 1 5 5 6 1 4 1 1 1 3
 complete 0 0 0 0 4 0 2 0 3 3 3 2 5 4
Nuclei
Ant/sup S1 bilateral 0 0 1 0 3 1 8 5 3 5 2 3 1 3
unilateral 2f 0 0 0 1 1 0 2 0 1 0 0 1 0
Lat ISP S1/S2 bilateral 0 0 1 0 2 1 3 3 0 3 2 1 1 2
unilateral 0 0 0 0 0 0 1 1 3 2 0 0 0 2
Lat ISP S2/S3 bilateral 0 0 0 0 0 0 4 1 1 0 2 3 1 1
unilateral 0 0 0 0 0 0 0 1 0 1 0 0 0 0
Lat S1 bilateral 0 0 0 0 2 1 3 3 1 4 1 2 0 2
unilateral 1g 0 1 0 0 0 1 1 2 2 0 0 1 0
Lat S2 bilateral 0 0 0 0 1 0 1 0 0 0 0 1 0 0
unilateral 0 0 0 0 0 0 0 1 0 0 0 0 0 1
Joint facet defects
 bilateral 0 0 0 0 0 1 0 0 0 0 0 0 0 0
 unilateral 1h 3i 1 3 3 1 2 2 1 1 1 0 1 0
  1. aOccurrence at age 9 and 11 years, respectively; b Occurrence at age 6, 7, 9, 10 and 11, respectively; cOccurrence at age 7 years; d Occurrence at age 9, 10 and 11 years, respectively; e Occurrence at age 10 and 11, respectively; f Occurrence at age 10 and 11 years, respectively; g Occurrence at age 11 years; hOccurrence at age 11 years; iOccurrence at age 7 and 8 years, respectively