This is a text tutorial that discusses the nerve stimulator-guided continuous lumbar plexus block. It is also known as the psoas compartment block or the lumbar paravertebral block. There is zero or almost zero good indica block. There is zero or almost zero good indicationtions for performing a single-injection lumbar plaxus block. And, if we do, we still have to use a Tuohy needle, because, like for all paravertebral blocks, the spinal roots are surrounded with dura and arachnoid maters.