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

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

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
Number of persons		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		6^a	10^b	3	6	2	4	3	7	2	4	0	1	1	4
complete		1^c	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		7^d	3^e	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
Ant/sup S1	unilateral	2^f	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
Lat ISP S1/S2	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
Lat ISP S2/S3	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
Lat S1	unilateral	1^g	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
Lat S2	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		1^h	3ⁱ	1	3	3	1	2	2	1	1	1	0	1	0

^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

ISSN: 1546-0096