The Sagittal Pelvic Thickness: A Determining Parameter for the Regulation of the Sagittal Spinopelvic Balance
Table 1
A
B
B1
B2
C
D1
D2
Normal
Painful cases
Low back pain cases
LBP + leg pain cases
Children
Spondylolysis grade 1-2
Spondylolysis grade 3-4
Men 27
Women 34
Men 69
Women 78
Men 26
Women 30
Men 43
Women 48
Men 6
Women 9
Men 26
Women 14
Men 4
Women 5
Mean
SD
Mean
SD
Mean
SD
Mean
SD
Mean
SD
Mean
SD
Mean
SD
Age (years)
30.9
7.5
43.1
14.4
42.6
13.7
46.8
17.2
7.2
1.9
27
12
36.5
8.1
Pelvic incidence (PI) (°)
48.3
10.1
49.6
9.8
52.8
9.2
47.3
10.5
40.4
7.8
60.5
11.5
70.6
9.3
Jackson’s angle (PR-S1)
36.9
9.1
35.8
8.9
32.5
9.3
38.1
9.9
44
7.7
25.9
10.5
17.2
8.6
Length of the upper plate of S1 (mm)
36
4.2
36
4
37
4.1
36
4
24.5
3.1
34
3.1
28.3
3.8
Mean diameter of the femoral heads (mm)
56.2
6.8
57
7.1
58
7.2
56
6.9
35.4
5.5
52
5.9
48
5.5
Femoral heads diameter/length of S1 (%)
64
5.1
63.2
5.1
63.8
5.2
63.0
6.9
69.2
3
65.3
5.9
53.3
3.4
Sagittal pelvic thickness (SPT) (mm)
132
28.1
132
27.5
130
26.4
134
27.9
84.2
5.8
116
29.5
108.7
24.7
Ratio “SPT/length of S1”
3.33
0.38
3.32
0.31
3.29
0.33
3.41
0.32
3.54
0.32
3.33
0.41
3.79
0.48
Ratio “SPT/femoral heads diameter”
2.12
0.26
2.11
0.26
2.10
0.30
2.16
0.29
2.38
0.31
2.19
0.33
2.29
0.29
Mean values (expressed in degree) and standard deviation of the parameters observed for the entire normal group (column A), the painful cases (column B, B1 only low back pain, B2 with leg spreading), and the children group (column C), the low grade listhesis (column D), and the high grade listhesis spondylolysis group (column E).
