To the present day, the motor phenomena in sciatica have been insufficiently investigated. In studying and writing about sciatica, attention has been concentrated exclusively on the symptoms of pain and on the sensory phenomena, and it is commonly considered that neuralgia of the sciatic nerve leaves the motor functions entirely or almost entirely undisturbed. Yet, in reality, this is not true; there is a whole series of motor phenomena in sciatica which deserve to be looked into as being of great diagnostic importance.
SIGNS AND SYMPTOMS
The only motor symptom mentioned by some authors in describing sciatica is the Kernig sign. This sign is not infrequently mistaken for the Lasègue sign; some authors (Levandovsky, Oppenheim, Klieneberger, Alexander1 and others) have regarded these symptoms as identical. Apparently this is due to the fact that in sciatica, Kernig's sign manifests itself mostly in the affected extremity, in which one also finds
SCHAMBOUROFF DA. MOTOR PHENOMENA IN SCIATICA. Arch NeurPsych. 1929;21(2):392–397. doi:10.1001/archneurpsyc.1929.02210200148013
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