Sciatica, or Lumbar Radiculopathy, is an irritation or compression of the sciatic nerve roots in the lumbar spine. Most commonly, sciatica causes lower back pain and pain that radiates down the leg. Because the sciatic nerve roots in the lumbar spine extend to the hips, buttocks, legs and feet – an injury or irritation in the lumbar spine region of your back causes symptoms in these areas. The Spine & Rehab Group’s Spine Specialists and Sciatica Doctors in Riverdale, New Jersey.