Table 1.

Measurements of angle of pre- and post-operative C2TLS (mean ± SD, range)

Measurements	STA (mean ± SD, range)	ITA (mean ± SD, range)	SCA (mean ± SD, range)	ICA (mean ± SD, range)
Cylinder (°)	56.60 ± 2.22, 53.69–61.44	56.38 ± 2.51, 51.99–61.02	0	0
Screw (°)	56.65 ± 2.24, 53.85–61.62	56.39 ± 2.45, 52.49–60.83	−0.07 ± 0.32, −1.09 to 0.32	0.12 ± 0.57, −0.38 to 2.11
P value	0.228	0.942	0.407	0.39

C2TLS C2 translaminar screw, STA superior transverse angle, ITA inferior transverse angle, SCA superior coronal angle, ICA inferior coronal angle