Peroneal nerve motor conduction to the extensor digitorum brevis

Area of Science:

• Neurology
• Neurophysiology
• Electrodiagnosis

Background:

• Peroneal motor studies of the extensor digitorum brevis are essential in electrodiagnosis.
• Existing normative data often suffers from methodological limitations and small sample sizes.
• There is a need for an updated, comprehensive database of peroneal nerve normal values.

Purpose of the Study:

• To generate an expanded database of normative electrophysiological values for the peroneal nerve.
• To establish reliable reference ranges for latency, amplitude, area, duration, and nerve conduction velocity.
• To analyze side-to-side and proximal-to-distal variations in asymptomatic subjects.

Main Methods:

• Tested 242 asymptomatic subjects without neuropathy risk factors.
• Analyzed peroneal motor responses for key electrophysiological parameters.
• Recorded side-to-side and proximal-to-distal variations.
• Presented data using mean ± 2 standard deviations and percentiles.

Main Results:

• Mean onset latency was 4.8 ms (SD, 0.8).
• Mean amplitude varied by age group (6.8 mV younger, 5.1 mV older than 40).
• Mean nerve conduction velocity ranged from 44-49 m/s.
• Established upper limits for side-to-side latency variation (1.4 ms) and amplitude difference (61%).
• Defined normal drop in nerve conduction velocity (10 m/s or 12%) and amplitude (25%) across segments.

Conclusions:

• The study provides an expanded database of normative values for peroneal nerve motor studies.
• These updated reference ranges improve the accuracy of electrodiagnostic assessments.
• The findings are crucial for differentiating neuropathic conditions from normal variations.