Place the patient in the lateral decubitus position
Place the probe (linear or curved array) in the gluteal crease, depending on the amount of adipose tissue in the gluteal crease
Identify the biceps femoris and the posterior femoral cutaneous nerve between the biceps femoris and the fascia lata (see next page)
Insert the needle in-plane from the lateral end of the probe and advance the needle tip to the target nerve
Inject 5 mL local anaesthetic perineurally
At this level the posterior femoral cutaneous nerve can be blocked selectively and typically includes the perineal branches and the inferior cluneal branches
The ultrasound-guided posterior femoral cutaneous nerve with a curved arrray probe. However, in such a lean patient a linear probe is often a better choice
