The impact of sagittal balance on clinical results after posterior interbody fusion for patients with degenerative spondylolisthesis: A Pilot study

Table 4 Mean values ( ± standard deviation) of Spinopelvic parameters in the two study groups based on changes in pelvic tilt after spinal fusion

Variable (normal range*)	Pelvic tilt(°) (12-18)			Sacral slope (°) (36-42)			Pelvic incidence(°) (48-55)
Group	Preop	Postop	Last FU	Preop	Postop	Last FU	Preop	Postop	Last FU
A (n = 10)	21.5 ± 5.0	24.3 ± 5.1	25.1 ± 6.2^†	31.2 ± 8.8	27.9 ± 8.7	28.9 ± 9.8	52.7 ± 7.9	52.2 ± 6.7	53.7 ± 7.0
B (n = 8)	26.4 ± 4.2	24.5 ± 4.7	18.4 ± 3.6^†	29.1 ± 62	29.2 ± 7.1	36.7 ± 6.5^†	55.5 ± 6.3	55.0 ± 8.0	55.1 ± 7.7
p value‡	0.06	ns	0.01	ns	ns	0.09	ns	ns	ns
Variable *(normal range)**	Thoracic kyphosis(°) (41-48)			Lumbar lordosis(°) (43-61)			SC7D/SFD (-1.9-0.1)
Group	Preop	Postop	Last FU	Preop	Postop	Last FU	Preop	Postop	Last FU
A (n = 10)	38.4 ± 9.7	36.4 ± 8.8	33.7 ± 10.0	46.5 ± 9.3	45.0 ± 9.9	48.1 ± 10.9	0.81 ± 0.9	0.82 ± 0.4	0.50 ± 0.6
B (n = 8)	35.2 ± 8.9	37.1 ± 8.9	41.3 ± 9.6^†	38.4 ± 8.1	39.9 ± 10.8	47.4 ± 7.5^†	0.74 ± 0.4	0.11 ± 0.4	0.27 ± 0.4^†
p value‡	ns	ns	ns	0.09	ns	ns	ns	0.04	ns

SC7D = sacro-C7 plume line distance; SFD = sacro-femoral distance
*Values are means from studies that included adult subjects aged 20 to 85 years without any symptom or history suggestive of spinal disease [5, 7, 22–33].
†p < 0.05; Statistical significance of value between preoperative and last follow up was determined using Wilcoxon's signed rank test.
‡ p < 0.05; Statistical significance of value between group A and B was determined using Mann-Whitney U test.

ISSN: 1471-2474