NCT02020096.

Trial name or title	Ultrasound plus nerve stimulator versus nerve stimulator guided lumbar plexus block
Methods	Randomized, parallel design
Participants	Patients 18 ‐ 70 years scheduled to undergo knee arthroscopy surgery
Interventions	US + NS versus NS
Outcomes	Time required to complete lumbar plexus block Total ultrasound visibility score Hymnody changes after skin incision Performance time of block
Starting date	28 November 2013
Contact information	Principal Investigator: Wei Mei, MD., PhD., Huazhong University of Science and Technology, China
Notes	Clinical trials identifier: NCT 02020096

US = ultrasound; (P)NS = (peripheral) nerve stimulation