Table 2.

Correlation of various radiographic measurements with postoperative coronal decompensation

	A compensated	B decompensated
Preop C7 PL deviation	NS	NS
Preop thoracic	NS	NS
Thoracic SB	NS	NS
Thoracic curve flexibility (%)	NS	0.061
Two years post thoracic	NS	NS
Preop thoracic AVT	NS	0.058
Postop thoracic AVT	NS	NS
Preop lumbar	NS	NS
Lumbar SB	NS	NS
Lumbar curve flexibility (%)	NS	NS
Two years post lumbar	NS	NS
Preop lumbar AVT	NS	NS
Postop lumbar AVT	NS	NS
Preop lumbar AVR AP	0.048	0.037
Preop lumbar AVR SB	0.063	0.042
Percent derotation LAV	0.005	<0.001
Preop sagittal T5–12	NS	NS
Postop sagittal T5–12	NS	NS
Preop sagittal T10–L2	NS	NS
Postop sagittal T10–L2	NS	NS
Preop sagittal L1–5	NS	NS
Postop sagittal L1–5	NS	NS

Correlation of various radiographic measurements with postoperative coronal decompensation expressed as Pearson correlation coefficients, significance set at P < 0.05

PL Plumbline deviation measured in cm from the CSVL, preop thoracic preoperative thoracic Cobb measurement (°), SB Cobb measurement on side-bending radiographs (°), Two years post thoracic 2 years postoperative Cobb measurement (°), AVT apical vertebral translation measured in cm from the CSVL, AVR AP apical vertebral rotation on AP standing radiographs acc. to Perdriolle (°), AVR SB apical vertebral rotation on supine side-bending radiographs acc. to Perdriolle (°), LAV lumbar apical vertebrae, AVT apical vertebral translation measured in cm from the CSVL, sagittal Cobb measurement on lateral radiographs (°)