Common peroneal neuropathy (CPN) can mimic lumbar radiculopathy both clinically and electrodiagnostically [1]. CPN caused by entrapment at the fibular head is the most frequent mononeuropathy of the lower limb [1]. The superficial peroneal sensory (SPS) nerve conduction study (NCS) is performed frequently in persons with suspected CPN. A normal SPS response often is used to differentiate radiculopathy from CPN. However, CPN at the fibular head can preferentially affect superficial peroneal motor fibers while sparing the SPS branches, making it difficult to differentiate it from L5 radiculopathy [1]. This finding is consistent with the concept of selective fascicular involvement in peripheral nerve lesions [1-3]. The 2 cases presented involve patients who had CPN with spared SPS fibers on electrodiagnostic testing (EDX), an uncharacteristic and atypical presentation. It is important to perform EDX to accurately diagnose such atypical CPN lesions, and especially to differentiate them from their common mimicker, L5 radiculopathy.