Analysis of Lumbar Sagittal Curvature in Spinal Decompression and Fusion for Lumbar Spinal Stenosis Patients under Roussouly Classification

Table 5

The changes number of patients preoperation and at final follow-up according to Roussouly classification ().

	Preoperation	Final follow-up
Roussouly classification	Number of case (, %)	Number of case (, %)	135.818	<0.001
Roussouly type I	39 (24.4%)	17 (10.6%)
Roussouly type II	89 (55.6%)	44 (27.5%)
Roussouly type III	17 (10.6%)	87 (54.4%)
Roussouly type IV	15 (9.4%)	12 (7.5%)
Types			15.960	<0.001
Standard group	17 (10.6%)	87 (54.4%)
Nonstandard group	143 (89.4%)	73 (45.6%)

The Roussouly type III is defined as standard, the other three types (Roussouly type II, Roussouly type III, and Roussouly type IV) are defined as nonstandard.