Lumbosacral Plexopathy

Nerve            Recording Sites        Stimulation Sites           F-Waves

Sural (s) bilat        ankle                calf
Sup Peron (s) bilat    ankle                lat leg
Peroneal (m) bilat    EDB                ankle and above knee    ankle
Tibial (m) bilat    AH                ankle and knee        ankle
Peroneal (m) bilat    TA                below and above knee
H-Reflex bilat        soleus                knee



Additional sensory and motor studies may be performed:

Femoral (m) bilat      rectus femoris        groin
Saphenous (s) bilat    leg                leg


Needle Examination

Perform needle exam on both lower extremities.  Test the minimum of one muscle innervated by the L2, L3, L4, L5 and S1 spinal roots (see Appendix C) and the lumbosacral plexus.  Examine additional muscles as needed to localize lesion.  Perform evaluation of the lumbar/sacral paraspinals to exclude radiculopathy or root avulsion.  Perform needle exam on the asymptomatic limb muscles for comparison as needed.