Intermittent Neurogenic Claudication Treatment With APERIUS®

Inclusion Criteria: * History of Degenerative Lumbar Spinal Stenosis (Lumbar spine level from L1 -L5), confirmed by Magnetic Resonance Imaging (MRI) at one or maximal two levels, with symptoms of intermittent neurogenic claudication. * Leg / Buttock / Groin pain, with or without back pain, relieved by flexion. If back pain is also present, it must be partially relieved when flexed. * Able to sit for 50 minutes without pain. * Able to walk a distance of 20 meters without pain. * Patient states availability for and willing to perform all follow -up examinations. * Patient signed informed consent form. * Adults (minimum 21 years of age). Exclusion Criteria: * Previous lumbar surgery. * Unremitting pain (leg/buttock/groin/back) in any spinal position. * Axial back pain without leg/buttock/groin pain. * Significant lumbar instability at the affected level: spondylolisthesis greater than grade 1 on a scale from 1-4. * Objective motor deficit. * Significant peripheral neuropathy by nerve conduction velocity tests (peroneal and sural nerves) according to the investigator. * Cauda equina syndrome, defined as neural compression causing neurogenic bowel (rectal incontinence) or bladder dysfunction (retention or incontinence). * Spinal Stenosis with clinical symptoms at one or more levels outside the L1-L5 lumbar region. * Severe symptomatic Spinal Stenosis requiring immediate surgical decompression,according to the investigator or lumbar spinal stenosis at more than 2 levels. * Lumba…