We do not intend to make a complete study of sciatica. We will limit ourselves to a clinical sign of very great diagnostic value. In spite of all that has been written on sciatica, we have found no mention of the symptom that we are about to bring to light.
It was our master, Professor Laségue, who called our attention to this clinical sign....
The patient is placed on the bed in the supine position, and we take the foot of the affected limb in one hand, as in figure 1. We place the other hand on the knee of the same limb, and, holding the leg in extension, we flex the thigh on the pelvis. Raising the limb only a few centimeters produces a sharp pain at the level of the sciatic notch, just at the emergence of the nerve. We replace the limb on the bed and