MiDAS I (Mild® Decompression Alternative to Open Surgery): Vertos Mild Patient Evaluation Study

Inclusion Criteria

• Symptomatic Lumbar Spinal Stenosis (LSS) primarily caused by dorsal element hypertrophy.
• Prior failure of conservative therapy.
• Radiologic evidence of LSS (L3-L5), Ligamentum flavum > 2.5mm, confirmed by pre-op MRI and/or CT.
• Central canal cross sectional area ≤ 100 square mm.
• Anterior listhesis ≤ 5.0mm.
• Able to walk at least 10 feet unaided before being limited by pain.
• Available to complete 12 weeks of follow-up.
• Consistent with the intended labeling statement for use.
• Able to use all package components to perform the procedure.
• A signed Informed Consent Form is obtained from the patient.

Exclusion Criteria

• Prior surgery at intended treatment level.
• History of recent spinal fractures with concurrent pain symptoms.
• Disabling back or leg pain from causes other than LSS (e.g. acute compression fracture, metabolic neuropathy, or vascular claudication symptoms, etc.).
• Significant / symptomatic disk protrusion or osteophyte formation.
• Excessive / symptomatic facet hypertrophy.
• Bleeding disorders and/or current use of anti-coagulants.
• Use of acetylsalicylic acid (ASA) and/or non-steroidal anti-inflammatory drug (NSAID) within 5 days of treatment.
• Epidural steroids within prior three weeks.
• Inability of the patient to lie prone for any reason with anesthesia support (e.g. chronic obstructive pulmonary disease (COPD), obesity, etc.).
• Any potential wound healing pathologies that may compromise outcomes, including diabetes, excessive smoking history, cancer, connective tissue diseases, recent spine radiation and severe COPD.
• Dementia and/or inability to give informed consent.
• Pregnancy.
• Intended treatment that is defined by the product labeling contraindications.
• On Workman's Compensation or considering litigation associated with back pain.