Patient Positioning:
The patient is placed in a prone position with the heels rotated laterally and a cushion pillow is used as an iliac wedge to facilitate the exposure.
Probe Positioning:
To identify the correct level, start with a saggital plane of the spinous processes. Then rotate the probe by 90 ° to show the spinous process and adjacent structures (lamina of the vertebral arch, facet joint,
accessory process, and mamillary process). The midpoint of the joint space of the facet joint is the reference point. The facet joints can be demonstrated in either longitudinal (sagittal) or transverse planes. Use an in plane technique (needle parallel to the probe). Due to its angle to the probe, sometimes the needle can be difficult to demonstrate.
Technique by using a transverse approach. Use an in plane technique (needle parallel to the probe).
Technique by using a transverse approach. Use an in plane technique (needle parallel to the probe).