Percutaneous kyphoplasty with or without posterior pedicle screw fixation for the management of severe osteoporotic vertebral compression fractures with nonunion

Table 3 Comparison of clinical results and radiographic data between the two groups at the final follow-up (\(\bar{\text{x}} \pm {\text{s}}\))

Variable	PKP group	PPSF + KP group	P value
Vertebral body height ratios improvement (%)^a
Anterior	34.9 ± 8.9	63.6 ± 7.6	< 0.01
Middle	28.4 ± 11.2	49.6 ± 7.7	< 0.01
Posterior	5.6 ± 4.5	3.3 ± 2.7	0.382
Cobb’s angle improvement	11.9 ± 3.9	18.7 ± 4.5	< 0.01
VWR improvement (%)^b	35.4 ± 10.7	64.6 ± 4.9	< 0.01
Cement leakage (N)	4	3	0.818
Adjacent vertebral fractures (N)	2	1	0.961

Values are expressed in mean ± standard deviation
N number
^aVertebral body height ratio (%) = (fractured vertebral body height/normal vertebral body height) × 100%
^bVWR, Vertebral wedge ratio (%) = (fractured vertebral body anterior height/fractured vertebral body posterior height) × 100%

ISSN: 1749-799X