Table 4. Spine surgeons’ opinions on clinical relevance of lumbar vacuum disc.

1. On a Likert scale from 1 to 10, how likely are you to agree with that a vacuum disc may cause vertical instability with symptomatic dynamic foraminal & lateral recess stenosis?

2. On a Likert scale from 1 to 10, how likely are you to agree with that a vacuum disc may cause mechanical back pain?

3. On a Likert scale from 1 to 10, how likely are you to agree with that a vacuum disc may cause sciatica-type low back and leg pain?