Sensory study Lower limb

Superficial fibular sensory nerve conduction study

Record between the tibialis anterior tendon and lateral malleolus and stimulate 14 cm proximally on the lateral calf.

01 · Placement

G1, G2, stimulation and ground landmarks

G1 active recording electrode

Place G1 at the anterolateral ankle between the tibialis anterior tendon and lateral malleolus over the superficial fibular sensory branches.

G2 reference electrode

Place G2 3–4 cm distal to G1 on the dorsolateral foot, keeping the recording pair aligned with the superficial fibular nerve.

Distance · 3–4 cm distal to G1

Stimulation site

Stimulate on the lateral calf 14 cm proximal to G1 over the superficial fibular nerve, with the cathode directed distally.

Distance · 14 cm from G1

Ground region

Place the ground on the anterolateral lower leg between the lateral-calf stimulation site and ankle recording electrodes.

02 · Reference values

Measure	Reference limit	Basis
SNAP amplitude	≥6 µV	AANEM educational reference
Conduction velocity	≥40 m/s	14 cm antidromic technique
Distal peak latency	≤4.4 ms	14 cm antidromic technique

03 · Technique

Fixed distance G1 to stimulation site: 14 cm

Sensitivity 5–10 µV/div

Filter 20 Hz–2 kHz

Sweep 1 ms/div

Temperature Maintain dorsal foot skin temperature >31°C

Ground Place the ground between the stimulating and recording electrodes

Primary evidence

Superficial fibular sensory reference values for a 14 cm lateral-ankle recording technique.