Normative Data for Trans-Tarsal Conduction Velocity of the Medial and Lateral Plantar Nerves Recorded from the Flexor Hallucis Brevis and First Dorsal Interosseous

Medial plantar and lateral plantar neuropathy, also known as posterior tarsal tunnel syndrome (PTTS), is a common lower extremity entrapment neuropathy that most individuals performing electrophysiological examinations will encounter with some frequency. However, few studies actually assess the primary area of entrapment located within the posterior tarsal tunnel (PTT). The purpose of this study was to establish a set of normative data for trans-tarsal motor nerve conduction velocity (MNCV) through the PTT for the medial plantar nerve (MPN) and lateral plantar nerve (LPN) when recording from the flexor hallucis brevis (FHB) and first dorsal interosseous (FDI) muscles respectively.