Table 2. Patient diagnoses.

Diagnosis	n	%
Spondylolisthesis	174	38.7
Spinal stenosis	137	30.4
Degenerative disc disease	46	10.2
Disc herniation	32	7.1
Spinal instability	26	5.8
Spondylosis	22	4.9
Radiculopathy	10	2.2
Infectious discitis	2	0.4
Post-traumatic deformity	1	0.2