Table 4.

Correlation table between quantitative vertebral parameters and adjacent level degeneration (Pearson’s test: P < 0.0001)

No.	Parameters	R coefficient
1	Significant changes in fused segment lordosis	0.4
2	Evolutive decrease of fused segment lordosis	0.5
3	Significant changes in posterior disc/vertebra height ratio	0.8
4	Loss of posterior disc height	0.6
5	2 and 4	0.6
6	1 and 3	0.8
7	Adjacent level hypermobility	0.6
8	2 and 3 and 7	0.6