title: MiDAS I (mild Decompression Alternative to Open Surgery): a preliminary report of a prospective, multi-center clinical study.
abstract: BACKGROUND
  Neurogenic claudication due to lumbar spinal stenosis is a common problem that can be caused by many factors including hypertrophic ligamentum flavum, facet hypertrophy, and disc protrusion. When standard medical therapies such as pain medication, epidural steroid injections, and physical therapy fail, or when the patient is unwilling, unable, or not severe enough to advance to more invasive surgical procedures, both physicians and patients are often left with a treatment dilemma. Patients in this study were treated with mild, an ultra-minimally invasive lumbar decompression procedure using a dorsal approach. The mild procedure is performed under fluoroscopic imaging to resect bone adjacent to, and achieve partial resection of, the hypertrophic ligamentum flavum with minimal disruption of surrounding muscular and skeletal structure.
  
  
  OBJECTIVE
  To assess the clinical application and patient safety and functional outcomes of the mild lumbar decompression procedure in the treatment of symptomatic central canal spinal stenosis.
  
  
  METHODS
  Multi-center, non-blinded, prospective clinical study.
  
  
  METHODS
  Fourteen US spine specialist practices.
  
  
  METHODS
  Between July 2008 and January 2010, 78 patients were enrolled in the MiDAS I Study and treated with the mild procedure for lumbar decompression. Of these patients, 6-week follow-up was available for 75 patients.
  
  
  METHODS
  Visual Analog Score (VAS), Oswestry Disability Index (ODI), Zurich Claudication Questionnaire (ZCQ), and SF-12v2 Health Survey. Outcomes were assessed at baseline and 6 weeks post-treatment.
  
  
  RESULTS
  There were no major device or procedure-related complications reported in this patient cohort. At 6 weeks, the MiDAS I Study showed statistically and clinically significant reduction of pain as measured by VAS, ZCQ, and SF-12v2. In addition, improvement in physical function and mobility as measured by ODI, ZCQ, and SF-12v2 was statistically and clinically significant in this study.
  
  
  CONCLUSIONS
  This is a preliminary report encompassing 6-week follow-up. There was no control group.
  
  
  CONCLUSIONS
  In this 75-patient series, and in keeping with a previously published 90-patient safety cohort, the mild procedure proved to be safe. Further, based on near-term follow-up, the mild procedure demonstrated efficacy in improving mobility and reducing pain associated with lumbar spinal canal stenosis.
authors.affiliation: Mid-Ohio Neurosurgical Care, Inc. Mansfield, OH 44903, USA. michelle@midohioneuro.com
authors.forename: Bohdan
authors.initials: B
authors.lastname: Chopko
authors.forename: David L
authors.initials: DL
authors.lastname: Caraway
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D015331:Cohort Studies; D019299:Decompression, Surgical / Q000295:instrumentation / Q000379:methods*; D005260:Female; D006801:Humans; D017843:Ligamentum Flavum / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery; D008159:Lumbar Vertebrae / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery; D008297:Male; D008875:Middle Aged; D019060:Minimally Invasive Surgical Procedures / Q000295:instrumentation / Q000379:methods*; D019635:Neurosurgical Procedures / Q000295:instrumentation / Q000379:methods*; D010865:Pilot Projects; D011446:Prospective Studies; D011859:Radiography; D013130:Spinal Stenosis / Q000473:pathology / Q000601:surgery*