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.
Angle calculation for needle puncture and balloon compression. a Needle angle for puncture of the intervertebral space T13/L1. The depicted needle angle is 30°, calculated by a dash to the intervertebral space L1/L2. b Inflated balloon during the spinal cord compression phase at thoracic spinal cord level T12/T13
