Postoperative laminectomy membrane associated with the use of simple laminectomy is well known as a post operative complication and o 血en causes the compression of the spinal cord or roots ． The authors have performed la 皿 inoplasty using titaniurn miniplates to prevent the formation of laminectomy membrane ． The purpose of this study was to review thirty cases who were operated on using laminoplasty with titanium miniplates and to evaluate this procedure ． The 30 padents consisted of spinal tumor (12 cases) ， far lateral disc hemiation (7 cases) ， arachnoid cyst (7 cases) ， AVM (2 cases) ， synovia ］cyst (l case) and chronic myelitis (l case) ． The follow − up period averaged 16． lmonths ． Twenty patients underwent a bilateral laminoplasty with titanium miniplates (2 cases concurrently using in ・ situ poste 囗or Iateral fusion (PLF) or pedicle screw PLF) and 10 patients underwent a hemi − laminoplasty with titanium miniplates (5 cases concurrently using posterior in − situ PLF or pedicle screw PLF) ． All patients had improvement in their neurological symptoms ． No patient developed increased kyphosisjnstability and or laminectomy membrane 負)110wing the procedure ． No case was complicated by neurological deterioration ， infection ， lamina displacement or implant migration ． A1山ough long − term results are unknown ， shon − term results are good and there are no incidences of complications ． In conclusion ， laminoplasty using titanium miniplates is a very useful and easy to apPly to prevent laminectomy membrane ． An added advantage is the magnetic resonance imaging compatibility of the implants fbr investigating the condition of the subdural and epidural lesions ． Key word ：instrumentation ， laminectomy membrane ， laminoplasty ， spine ， titanium miniplate Spina且 Surgery 14 (2)： 111-116， 2000

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