Table 4 Quantitative evaluation of bony resection range rate and volume rate (N = 33) (mean ± standard deviation)

Resection range rate

of facet joint^a

0.17

0.22

0.21 ± 0.04

0.31 ± 0.06

0.29 ± 0.10

0.36 ± 0.11

NA

0.42

Resection range rate

of facet joint^b

0.20

0.18

0.28 ± 0.05

0.26 ± 0.05

0.32 ± 0.09

0.28 ± 0.05

NA

0.36

Resection range rate of pedicle

0.19

0.25

0.22 ± 0.05

0.29 ± 0.08

0.34 ± 0.03

0.40 ± 0.07

NA

0.45

Resection volume rate

of facet joint^a

0.20

0.23

0.23 ± 0.06

0.33 ± 0.09

0.31 ± 0.08

0.38 ± 0.09

NA

0.41

Resection volume rate

of facet joint^b

0.24

0.21

0.30 ± 0.09

0.28 ± 0.07

0.35 ± 0.08

0.32 ± 0.05

NA

0.35

Resection volume rate of pedicle

0.17

0.27

0.29 ± 0.10

0.34 ± 0.11

0.31 ± 0.12

0.43 ± 0.08

NA

0.46