Figure 1
From: Anatomical, Clinical and Electrical Observations in Piriformis Syndrome
Electro-diagnostic test of a 22 year-old female patient complaining of right sided piriformis muscle syndrome since 6 years. (A-1) The H reflex of the tibial nerve, the leg in a straight position, was normal, (A-2) showed slight disturbance of the H wave, during the stress maneuver of flexion and internal rotation of the lower limb. (B-1) the H-reflex of the common peroneal nerve, the leg in a straight position, was normal, (B-2) noted the complete extinction of the H wave, during the painful maneuver of forced adduction-internal rotation, (B-3) the H reflex reappeared when the leg was returned in the relieved straight position.