Lumbar plexus block- Description of all approaches

All the approaches described in this video
Useful reading of the original descriptions
Ultrasound-guided lumbar plexus block through the acoustic window of the lumbar ultrasound trident
M. K. Karmakar*, A. M.-H. Ho, X. Li, W. H. Kwok, K. Tsang and W. D. Ngan Kee
Br. J. Anaesth. (2008) 100 (4): 533-537.
http://bja.oxfordjournals.org/content...

Ultrasound-guided lumbar plexus block using a transverse scan through the lumbar intertransverse space: a prospective case series.
Karmakar MK, Li JW, Kwok WH, Hadzic A.
Reg Anesth Pain Med. 2015 Jan-Feb;40(1):75-81.

The Shamrock lumbar plexus block: A dose-finding study
Sauter, AR.; Ullensvang, K; Niemi, G; Lorentzen, HT.; Bendtsen, TF; Børglum, J; Pripp, AH; Romundstad, L.
European Journal of Anaesthesiology: November 2015 - Volume 32 - Issue 11 - p 764–770