2025 Workshop Handout Bundle-W111AS Lower Limb Sensory Study

W111AS Lower Limb Sensory Study - Sridhara

Pdf Summary

The "Lower Limb Sensory Study Workshop" by Dr. Channarayapatna R. Sridhara focuses on sensory nerve conduction studies (SNCS) in the lower limbs, emphasizing less commonly examined nerves. Sensory conduction studies, introduced in 1956, are vital for diagnosing nerve pathologies affecting sensory fibers such as mononeuropathies, generalized sensory neuropathies, neuronopathies, and early sensory fiber involvement in mixed nerve lesions. Sensory studies detect changes often preceding motor fiber involvement, with sensory fibers being sensitive to axonal loss or conduction blocks, while pure demyelination usually preserves function.<br /><br />The workshop objectives include understanding lower limb sensory nerve anatomy, incorporating sensory evaluation into electrodiagnostic studies, performing studies on nerves like the superficial fibular, sural, saphenous, posterior femoral cutaneous, and lateral femoral cutaneous nerves, minimizing technical noise, and interpreting sensory findings to assist diagnosis and management.<br /><br />Key diagnostic insights include differentiating preganglionic (e.g., radiculopathies) versus postganglionic lesions (e.g., plexopathies, mononeuropathies) based on sensory amplitude changes. Robust sensory responses despite sensation loss suggest preganglionic lesions, whereas reduced sensory amplitudes indicate postganglionic involvement due to axon loss or conduction block, such as in carpal tunnel syndrome.<br /><br />The workshop highlights technical challenges affecting sensory responses, including edema, obesity, skin condition, age, temperature, and local trauma. Bilateral comparative studies are essential for distinguishing focal from generalized pathology. Techniques to improve recording quality involve specific electrode placement, use of gel, skin preparation, proper stimulator handling, and, where needed, needle stimulation to enhance responses in difficult cases.<br /><br />Detailed protocols for each nerve’s sensory conduction study are provided, alongside age-adjusted normative reference values for amplitude, latency, and conduction velocity. The workshop also provides practical tips for sensory and needle stimulation to optimize data quality.<br /><br />In summary, this workshop equips practitioners to perform precise and reliable sensory nerve conduction studies in the lower limbs, enhancing diagnostic accuracy for a range of sensory neuropathies and nerve lesions.

Keywords

Lower Limb Sensory Study Workshop

Sensory Nerve Conduction Studies

Sensory Neuropathies

Mononeuropathies Diagnosis

Sensory Fiber Evaluation

Electrodiagnostic Techniques

Superficial Fibular Nerve

Sural Nerve Studies

Preganglionic vs Postganglionic Lesions

Sensory Nerve Conduction Protocols