Research Article

MATrix LABoratory Algorithm in Ultrasound Image-Guided General Drug Anesthesia along with Lumbar and Sacral Plexus Block in Hip Replacement under

Figure 2

Ultrasonography of the lumbar plexus: before splitting (a) and after splitting (b). ESM meant erector spine muscle, PsMM meant psoas major muscle, and TP meant transverse process.
(a)
(b)