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Table 3 Radiographic parameters of segmental alignment between open and percutaneous techniques of pedicle screw fixation

From: Posterior fixation can further improve the segmental alignment of lumbar degenerative spondylolisthesis with oblique lumbar interbody fusion

Radiographic parameters Prior to cage insertion Following cage insertion Following posterior fixation
Disc height (mm)
 Open 8.7 ± 1.7a 11.9 ± 1.9 11.4 ± 2.4
 Percutaneous 7.3 ± 1.2a 11.5 ± 1.3 12.5 ± 2.1
 Total 8.2 ± 1.6 11.8 ± 1.7 11.8 ± 2.3
Disc height-Anteriorb (mm)
 Open 10.3 ± 2.3a 13.9 ± 2.2 14.3 ± 2.2a
 Percutaneous 8.4 ± 2.0a 12.6 ± 1.5 12.3 ± 1.8a
 Total 9.6 ± 2.3 13.4 ± 2.1 13.7 ± 2.3
Disc height-Posterior (mm)
 Open 6.4 ± 2.1 9.2 ± 2.1 8.5 ± 2.0
 Percutaneous 5.5 ± 1.1 8.9 ± 2.1 8.2 ± 1.4
 Total 6.1 ± 1.9 9.1 ± 2.1 8.4 ± 1.8
Slip ratio (%)
 Open 10.8 ± 4.4 8.3 ± 4.4 2.1 ± 3.7
 Percutaneous 11.6 ± 5.1 8.3 ± 4.7 2.2 ± 3.4
 Total 11.1 ± 4.6 8.3 ± 4.4 2.1 ± 3.6
Segmental lordosis (°)
 Open 9.5 ± 3.5 8.7 ± 3.2 10.9 ± 3.8
 Percutaneous 7.1 ± 3.7 7.4 ± 2.5 10.4 ± 3.3
 Total 8.7 ± 3.7 8.3 ± 3.0 10.7 ± 3.6
  1. aMeans comparison of open and percutaneous techniques showed statistically significant
  2. bMeans statistically significant following multivariate analysis between open and percutaneous techniques