Sacro-Iliac Joint Sensory Block and Radiofrequency Ablation: Assessment of Bony Landmarks Relevant for Image-Guided Procedures

Table 4

Distance between posterior sacral foramen and the medial margin of a strip lesion from TST1 to TST3.

PSF	Mean DT (mm)	⁢Mean distance: medial margin of lesion to lateral margin of PSF (mm)
		8 mm lesion diameter			9 mm lesion diameter			10 mm lesion diameter
		M & F	M	F	M & F	M	F	M & F	M	F
S1	6.34	2.34	1.92	2.75	1.84	1.42	2.25	1.34	0.92	1.75
S2	7.14	3.14	2.71	3.21	2.64	2.21	2.71	2.14	1.71	2.21
S3	9.45	5.45	5.68	5.22	4.95	5.18	4.72	4.45	4.68	4.22

DT, distance from lateral margin of foramen to transverse sacral tubercle; PSF, posterior sacral foramen; TST, transverse sacral tubercle.