Table 4.

Anterior vertebral body height of two groups (%)

Group	Preoperative	Postoperative	1 month	2 months	3 months	6 months	1 year	2 years
1	49.8 ± 8.1	74.7 ± 7.0	63.6 ± 6.7	63.4 ± 6.7	63.4 ± 6.6	63.4 ± 6.6	63.4 ± 6.6	63.4 ± 6.6
2	49.7 ± 8.0	81.2 ± 6.6	79.7 ± 6.6	78.1 ± 6.6	77.9 ± 6.6	77.8 ± 6.5	77.8 ± 6.5	77.8 ± 6.5

Values are expressed as the mean ± SD. There was significant difference (P < 0.005) after surgery between the two groups. The anterior height after surgery was significantly higher (P < 0.005) than that of before surgery in two groups. The anterior height immediately after surgery was significantly higher (P < 0.005) than that of 1 month, 2 months, 3 months, 6 months, 1 year, and 2 years in group 1.