title: Lift-up laminoplasty for myelopathy caused by ossification of the posterior longitudinal ligament of the cervical spine.
abstract: OBJECTIVE
  We have utilized lift-up laminoplasty to treat patients with myelopathy caused by ossification of the posterior longitudinal ligament (OPLL) of the cervical spine. The preliminary surgical outcome with computer-assisted morphological assessment is presented.
  
  
  METHODS
  The surgical technique of lift-up laminoplasty includes standard posterior exposure of the cervical spine, en-bloc laminectomy, and expansion of the cervical canal by lift-up of the laminae with custom-designed hydroxyapatite laminar spacers and stabilization of the laminae using titanium miniplates. From 1998 to 2003, 10 consecutive patients with cervical myelopathy secondary to OPLL have been treated with this method and comprehensively evaluated. Care was taken to tailor the treatment to individual patients by using different sizes of spacers to adjust the degree of expansion depending on the amount of stenosis of the cervical spine. The degree of expansion of the cervical canal was altered by design, based on the preoperative imaging simulation.
  
  
  RESULTS
  Preliminary surgical outcome, evaluated at 6 months after surgery, revealed a significant improvement of neurological function. Image analysis revealed that the cervical canals were significantly expanded, with a mean reduction of 13.1% in the stenosis ratio. Lift-up laminoplasty was effective in the treatment of patients with myelopathy secondary to cervical OPLL, and the amount of expansion could be individually adjusted at the discretion of the surgeon.
  
  
  CONCLUSIONS
  Although analysis with a larger population and a longer follow-up period needs to be undertaken, our method of lift-up laminoplasty appears to be a viable choice among standard posterior cervical approaches for cervical OPLL.
authors.affiliation: Department of Neurosurgery, Osaka City University Graduate School of Medicine, Osaka, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Takami
authors.forename: K
authors.initials: K
authors.lastname: Ohata
authors.forename: T
authors.initials: T
authors.lastname: Goto
authors.forename: M
authors.initials: M
authors.lastname: Nishikawa
authors.forename: A
authors.initials: A
authors.lastname: Nishio
authors.forename: N
authors.initials: N
authors.lastname: Tsuyuguchi
authors.forename: M
authors.initials: M
authors.lastname: Hara
mesh_terms: D000368:Aged; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted; D017846:Longitudinal Ligaments / Q000473:pathology / Q000503:physiopathology / Q000601:surgery*; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D019635:Neurosurgical Procedures; D009999:Ossification, Heterotopic / Q000473:pathology / Q000503:physiopathology / Q000601:surgery*; D012189:Retrospective Studies; D013117:Spinal Cord Compression / Q000473:pathology / Q000503:physiopathology / Q000601:surgery*; D014057:Tomography, X-Ray Computed; D016896:Treatment Outcome