Which muscle groups are most appropriately monitored for L5 and S1 nerve roots in sEMG?

Monitoring the PL (Peroneus Longus) for L5-S1 and the Semimembranosus for L5-S2 in sEMG is particularly appropriate because these muscles are innervated by the corresponding nerves derived from the lumbar and sacral plexus. The L5 nerve root contributes to both the Peroneus Longus and Semimembranosus muscles, making them excellent indicators for assessing the integrity of the L5 and S1 nerve roots during surgical procedures.

The Peroneus Longus is involved in eversion of the foot and can provide insights into the function of the L5 nerve root as it is responsible for foot dorsiflexion and eversion, while the Semimembranosus, part of the hamstring group, corresponds well with the L5-S2 roots, reflecting their motor function.

By monitoring these specific muscle groups, neuromonitoring can effectively detect any changes or compromises in neural function during surgery, ensuring patient safety and surgical efficacy. This level of specificity helps prevent injuries and functional impairments associated with these critical nerve roots.