Fig 2 Scores on Zurich Claudication Questionnaire (top), modified Roland Disability Questionnaire (middle), and visual analogue scale (bottom) in two groups during follow-up. IPD=interspinous process device
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.