2026 Workshop Handout Bundle-W125RD Unusual Lower Limb Nerve Conductions

W125RD Unusual Lower Limb Nerve Conductions - Raheja Wiley

Pdf Summary

This workshop reviews lower-limb nerve conduction techniques, electrode placement, and interpretation tips for the tibialis anterior (deep peroneal) motor nerve, tarsal tunnel nerves, H reflex, lateral femoral cutaneous nerve, femoral motor nerve, and saphenous sensory nerve.<br /><br />The tibialis anterior motor study can help identify peroneal neuropathy at the fibular neck, especially when extensor digitorum brevis responses are absent or very small. Stimulation across the fibular neck assesses focal slowing or conduction block; stronger stimulation may be needed, while avoiding tibial nerve co-stimulation.<br /><br />A complete tarsal tunnel assessment includes bilateral motor recordings from abductor digiti quinti pedis and/or abductor hallucis, plus medial and lateral plantar sensory studies. Side-to-side comparisons are essential because normal plantar responses may be small or difficult to obtain. Averaging can help, and electrode position should be checked if motor responses begin with an initial positive deflection.<br /><br />The H reflex evaluates the S1 reflex pathway and may be abnormal in conditions including S1 radiculopathy, polyneuropathy, and tibial or sciatic neuropathy. Bilateral testing is required; a side-to-side latency difference of 1.5 ms is considered abnormal. Submaximal stimulation is used, and plantarflexion or the Jendrassik maneuver may help elicit a response.<br /><br />The lateral femoral cutaneous nerve study supports evaluation of meralgia paresthetica. Because responses can be difficult to obtain—particularly in people with obesity—bilateral comparison is important before labeling an absent or low response abnormal.<br /><br />Femoral motor and saphenous sensory studies can help assess femoral nerve or lumbar plexus lesions. Their responses may also be small or technically challenging, so interpretation should account for symmetry, patient factors, and side-to-side amplitude and latency comparisons.

Keywords

lower-limb nerve conduction

tibialis anterior motor study

deep peroneal nerve

tarsal tunnel syndrome

H reflex

lateral femoral cutaneous nerve

femoral motor nerve

saphenous sensory nerve

peroneal neuropathy

meralgia paresthetica