Trans-sacral screw fixation in the treatment of high dyplastic developmental spondylolisthesis

Table 1 Measurements and indexes performed for the operative planning

	Test	Our case	NR
Slipping		63%
Sacro lumbar indexes	Lumbar index	45%	> 50%
	Pelvic incidence	86.2°	50°-60°
	Sagittal pelvic tilt index	0.52	> 0.70
Pelvic nutation indexes	Sacral slope	39.9°	32°-49°
	Pelvic tilt	40.6°	7.2°-7.9°
	Sacral inclination	45°
Sacro-lumbar ratio	Slip angle	77.3°
	Sacral kyphosis angle	25.8°