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.
A case of chronic LBP, worse with standing and walking. Signs of instability are seen at L4-L5 (green arrow) and L5-S1 (orange arrow) in flexion (A) and extension (B) radiography. MRI shows bone edema (green arrow) and facets joint effusion (orange arrow) (C). LBP = low back pain; MRI = magnetic resonance imaging.
