- Patients with moderate disability based on the Oswestry Disability Index (ODI), among those diagnosed with a single level of unilateral herniated intervertebral disc among the 3rd-4th and 4th-5th lumbar vertebrae, or the 5th lumbar vertebra-sacral vertebra with back pain or radiating pain in the lower extremities that has been unresponsive to conservative therapy for more than six weeks