MILD (Minimally Invasive Lumbar Decompression) is a minimally invasive treatment for patients with spinal stenosis; it is particularly effective at relieving: lower back pain with leg heaviness, numbness; and/or tingling with walking that improves with sitting. Also known as Percutaneous Image-Guided Lumbar Decompression (PILD), the MILD procedure involves needle-like instruments that are used to remove a portion of a thickened ligament in the back of the spinal column; this is performed to increase spinal canal space and remove nerve root impingement.