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.
Anteroposterior (a) and lateral flexion (b) and extension (c) lumbar radiographs 16 months status post a L4–L5 TLIF procedure performed with rhBMP-2. Note the bridging interbody bone between the L4 and L5 vertebral bodies and the absence of motion when comparing the flexion and extension views. Because the interbody cage itself is radiolucent, metallic markers are used in the cage to allow visualization of its position on X-ray
