title: Unilateral percutaneous pedicle screw instrumentation with minimally invasive TLIF for the treatment of recurrent lumbar disk disease: 2 years follow-up.
abstract: OBJECTIVE
  To compare the clinical and radiological outcomes of recurrent disk disease in patients who underwent unilateral and bilateral percutaneous pedicle screw instrumentation with Mis-TLIF.
  
  
  METHODS
  10 patients treated with unilateral percutaneous instrumentation plus Mis-TLIF formed Group 1 while the other 10 patients treated with bilateral percutaneous instrumentation plus Mis-TLIF formed Group 2. Clinical outcomes were graded using the visual analog scale (VAS) and the Oswestry disability index (ODI) scores. Peroperative and 2-year follow-up scores were obtained. Postoperative imaging techniques were used for the assessment of fusion, subsidence and spinal alignment.
  
  
  RESULTS
  According to preoperative and postoperative VAS/ODI scores, statistically significant differences were noted in the unilaterally and bilaterally instrumented group. However, a statistically significant difference was not observed between the unilateral and bilateral groups. Radiological evidence of successful arthrodesis was noted in 8 of 10 patients (80%) in the unilaterally instrumented group and in 9 of 10 patients (90%) in the bilaterally instrumented group at the 2 years follow-up. No metal failure, cage migration, vertebral fracture, subsidence or adjacent level disease was experienced.
  
  
  CONCLUSIONS
  Mis-TLIF with unilateral percutaneous pedicle screw instrumentation is an excellent option in the treatment of selected recurrent disk disease patients.
authors.affiliation: Baskent University, Faculty of Medicine, Department of Neurosurgery, Ankara, Turkey. erkinso@gmail.com
authors.forename: Erkin
authors.initials: E
authors.lastname: Sonmez
authors.forename: Ilker
authors.initials: I
authors.lastname: Coven
authors.forename: Fikret
authors.initials: F
authors.lastname: Sahinturk
authors.forename: Cem
authors.initials: C
authors.lastname: Yilmaz
authors.forename: Hakan
authors.initials: H
authors.lastname: Caner
mesh_terms: D000328:Adult; D001863:Bone Screws / Q000009:adverse effects; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D016268:Internal Fixators; D055959:Intervertebral Disc Degeneration / Q000473:pathology / Q000601:surgery*; D007405:Intervertebral Disc Displacement / Q000473:pathology / Q000601:surgery*; D008159:Lumbar Vertebrae / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D011184:Postoperative Period; D019736:Prostheses and Implants; D055502:Secondary Prevention; D016896:Treatment Outcome