Assessment of sagittal spinopelvic parameters in a Taiwanese population with spondylolysis by the EOS imaging system: a retrospective radiological analysis

Table 4 Parameters for high-grade and those without high-grade intervertebral disc degeneration in spondylolysis patients

Condition of IVD degeneration	Prevalence of Spondylolisthesis		PI (°)	SS (°)	PT (°)	LL (°)	TK (°)	SVA (mm)	CAM (mm)	T1t (°)	T9t (°)	SSA (°)	KE (°)
No High-grade	50 % (10/20)^a	Mean	50.45	41.15	9.40	42.20	29.65	7.80	-16.80	2.93	6.80	131.60	3.06
n = 20		SD	10.70	8.75	5.68	13.04	8.84	17.05	16.40	1.66	3.14	9.46	2.40
High-grade	92.3 % (12/13)^b	Mean	58.38	44.15	14.15	47.07	36.30	23.09	-9.18	2.54	8.27	131	3.45
n = 13		SD	12.65	8.07	8.02	16.38	14.42	30.65	32.04	2.38	3.16	7.57	2.38
P value	0.001^*		0.087	0.334	0.110	0.501	0.221	0.164	0.610	0.507	0.413	0.760	0.507

IVD intervertebral disc; SVA sagittal vertical axis; CAM center of acoustic meatus; T1t T1 tilt; T9t T9 tilt; SSA spinal-sacral angle; KE knee extension
^*P < 0.05 was defined as statistically significant
^a All of the 10 patients had grade 1 spondylolisthesis, according to the meyerding classification
^a Of the 12 patients, 10 had grade 1 and 2 had grade 2 spondylolisthesis

ISSN: 1471-2474