Effect of Discectomy on Dynesys Dynamic Fixation in the Treatment of Lumbar Degenerative Diseases

Table 2

Radiography outcomes.

Group	n	S-intervertebral height (mm)			S-ROM (°)			U-intervertebral height (mm)		U-ROM (°)
		Pre	FFU	R (%)	Pre	FFU	R (%)	Pre	FFU	Pre	FFU
A	27	9.7 ± 1.9	9.1 ± 2.0	94.5 ± 12.0	6.7 ± 2.7	5.2 ± 1.9^†	79.6 ± 19.4	11.2 ± 1.4	10.9 ± 1.5	6.0 ± 2.4	7.6 ± 3.2^§
B	35	10.2 ± 2.0	8.0 ± 2.4	79.6 ± 20.0	6.1 ± 2.5	3.2 ± 1.8^†	54.0 ± 25.5	11.6 ± 2.3	11.5 ± 1.6	6.6 ± 2.6	8.4 ± 3.9^§
t		−0.95	1.92	3.44	0.96	4.05	4.34	−0.85	−1.50	−0.88	−0.80
P		0.35	0.06	0.00	0.34	0.00	0.00	0.40	0.14	0.38	0.43

Pre: preoperative; FFU: final follow-up; R: retention percentage. S-intervertebral height: surgical segment intervertebral height; S-ROM: surgical segment range of motion. U-intervertebral height: upper adjacent segment intervertebral height; U-ROM: upper adjacent segment range of motion. T-test results showed the surgical segment intervertebral height in the two groups was statistically different between preoperation and the final follow-up (). ^†T-test results showed the surgical segment range of motion in the two groups was statistically different between preoperation and the final follow-up (). ^§T-test results showed the upper adjacent segment range of motion in the two groups was statistically different between preoperation and the final follow-up ().