Table 1. Patient diagnoses.

Radicular includes a diagnosis of radiculopathy, disc displacement, degenerative disc disease, pain syndrome, neuropathy, disc herniation, neuritis, and radiculitis. Degenerative includes a diagnosis of spinal stenosis, spondylosis, arthrodesis, spinal fusion, arthropathy, sacroiliitis, back pain (unspecified), and postlaminectomy syndrome. Deformity includes a diagnosis of spondylolisthesis and scoliosis.

Category	N
Radicular	88
Degenerative	81
Deformity	17