The Sagittal Pelvic Thickness: A Determining Parameter for the Regulation of the Sagittal Spinopelvic Balance

Table 3

	Normal		LGL spondylolysis		Children
	𝑛=61		𝑛=40		𝑛=15
	𝑟	𝑃	𝑟	𝑃	𝑟	𝑃
SPT/TF	0.237	<0.05	0.454	<0.005	0.077	N.S.
SPT/S1	0.334	<0.002	0.635	<0.001	0.3	<0.2

Spearman’s coefficients of correlation of the relation between pelvic incidence (PI) and the sagittal pelvic thickness (SPT) expressed relating to the femoral heads diameter (SPT/TF) and to the sagittal length of the upper plate of S1 (SPT/S1) for the control, the low grade listhesis spondylolysis, and the children groups.