title: Aperius PercLID stand alone interspinous system for the treatment of degenerative lumbar stenosis: experience on 152 cases.
abstract: METHODS
  This study is a retrospective clinical investigation of a new interspinous device implanted via a totally percutaneous technique involving 152 consecutive patients.
  
  
  OBJECTIVE
  Evaluation of the efficacy of the percutaneous Aperius stand alone implant in patients with degenerative lumbar stenosis and neurogenic intermittent claudication that did not respond to conservative treatment.
  
  
  BACKGROUND
  The use of interspinous implants grew markedly during the last years. Nowadays, many extension controller devices are positioned through minimally invasive procedures.
  
  
  METHODS
  From January 2007 to February 2008, 152 consecutive patients with neurogenic intermittent claudication were treated with Aperius PercLID system. Under a local anesthesia, a 1.5 cm skin incision was performed. Trocars for interspinous space distraction were positioned using fluoroscopy guidance. A suitable size Aperius was positioned and released in the interspinous space with a totally percutaneous technique. In 145 patients 1 level was treated, whereas 6 patients received 2 level treatments, and 1 patient received 3 level treatments. The levels treated were L4-L5 in 125 patients (78.2%), L3-L4 level in 26 patients (16.3%), L2-L3 level in 5 patients (3.1%), L5-S1 level in 3 patients (1.8%), and L1-L2 level in 1 patient (0.6%).
  
  
  RESULTS
  The surgical time ranged from 8 to 14 minutes for 1 single level. No adverse events were noted. In 1 case (0.6%), Aperius was not implanted because of hypertrophic facet joints that have hindered the correct insertion of the device; we observed only 2 cases of therapeutic failure (1.3%). There was a significant improvement in the Visual Analog Scale and Zurich Claudication Questionnaire scores for low-back and leg pain and for neurogenic claudication.
  
  
  CONCLUSIONS
  These results indicate that Aperius PercLID system offers an easy, safe, and effective treatment for patients with lumbar degenerative stenosis. Thus, this device system treatment represents a valid alternative to the traditional surgical techniques.
authors.affiliation: Neurosurgical Unit, Policlinico Casilino, Rome, Italy.
authors.forename: PierVittorio
authors.initials: P
authors.lastname: Nardi
authors.forename: Daniel
authors.initials: D
authors.lastname: Cabezas
authors.forename: Giancarla
authors.initials: G
authors.lastname: Rea
authors.forename: Benedetta Ludovica
authors.initials: BL
authors.lastname: Pettorini
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006801:Humans; D007383:Intermittent Claudication / Q000209:etiology; D008159:Lumbar Vertebrae / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D017060:Patient Satisfaction; D018579:Patient Selection; D019736:Prostheses and Implants / Q000009:adverse effects; D019919:Prosthesis Implantation / Q000009:adverse effects / Q000379:methods*; D013130:Spinal Stenosis / Q000601:surgery*; D011795:Surveys and Questionnaires; D016896:Treatment Outcome