title: The results of a consecutive series of dynamic posterior stabilizations using the PercuDyn device.
abstract: OBJECTIVE
  To evaluate the results of a consecutive series of patients affected by lumbar discogenic pain associated with facet pain and canal stenosis surgically treated with the PercuDyn device.
  
  
  METHODS
  From 2009, 129 consecutive patients (96 M, 33 F, mean age 62) were treated with posterior dynamic stabilization screws (PercuDyn). Inclusion criteria were minimum follow-up of 24 months; pain localized at the lumbar spine column alone or in association to lower limb radicular pain; magnetic resonance evidence of disc degeneration associated with facet degeneration and canal stenosis. Patients were clinically studied using VAS scale and Oswestry Disability Index (ODI); CT assessment of the neuroforamina and spinal canal areas was done at 1 month of follow-up.
  
  
  RESULTS
  At 24 months of follow-up, 96 patients fulfilled the inclusion criteria. 96 intervertebral spaces were treated (85 levels L5-S1, 11 levels L4-L5). The VAS scale showed a statistically significant difference at 1 month, 6 months and 2 years with respect to the pre-operative value (p < 0.001). The ODI score registered a significant difference with the same fashion (p < 0.001 both at 1- and 6-month, and 2-year follow-up with respect to the pre-operatory). At 1-month follow-up, neuroforamina and spinal canal areas were considerably wider (p < 0.05). 70 (72.5 %) patients were satisfied of the procedure.
  
  
  CONCLUSIONS
  In this wide cohort study, the PercuDyn ensured good clinical and radiological results, with more than 70 % of patients satisfied of the procedure. Very few complications were noted, with an immediate return to daily activities. At longer follow-ups, 10 % of patients received revision surgery.
authors.affiliation: Department of Orthopaedic Surgery, Clinica San Feliciano, Via di Val Cannuta 132, 00166, Rome, Italy.
authors.forename: Gianfranco
authors.initials: G
authors.lastname: Canero
authors.affiliation: Department of Orthopaedic Surgery, Clinica San Feliciano, Via di Val Cannuta 132, 00166, Rome, Italy. stefcarbone@yahoo.it.|, Via Giulio Pittarelli 114, 00166, Rome, Italy. stefcarbone@yahoo.it.
authors.forename: Stefano
authors.initials: S
authors.lastname: Carbone
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001863:Bone Screws; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D055959:Intervertebral Disc Degeneration / Q000150:complications / Q000601:surgery*; D008159:Lumbar Vertebrae / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D019637:Orthopedic Procedures / Q000295:instrumentation* / Q000379:methods; D011446:Prospective Studies; D013130:Spinal Stenosis / Q000209:etiology / Q000601:surgery*; D016896:Treatment Outcome
keywords: Disc degeneration; Discogenic lumbar pain; Minimally invasive surgery; PercuDyn; Posterior dynamic stabilization