@spineinsiders: Pain Shooting Down Your Leg? 3 Common Causes of L4-L5 or L5-S1 Sciatica Herniated disc, spinal stenosis, or piriformis syndrome. Here's how the pattern differs, and which signs need the emergency room right away. Save this and tell me if your pain stops at the knee or goes to the foot. #L4L5 #L5S1 #Sciatica #SciaticaPain #SpineHealth