title: [Comparison of allogenic versus ostetic artificial bone in double door laminoplasty].
abstract: OBJECTIVE
  To study the application of allogenic bone and Ostetic artificial bone in double door laminoplasty.
  
  
  METHODS
  From June 2004 to June 2010, a total of 111 patients underwent double door laminoplasty. And allogenic (group A, n = 63) and Ostetic artificial (group B, n = 48) bones were used. They had spinal stenosis at least several levels or OPLL (Ossification of posterior longitudinal ligament). Their follow-up period was 12 months. Anteroposterior compression ratio was used to evaluate the neurological status. Range-of-movement (ROM) of cervical spine and bone fusion was determined by radiography and computed tomography (CT) during the follow-ups.
  
  
  RESULTS
  Anteroposterior compression ratio: group A improved from 0.18 preoperation to 0.43 postoperation while group B increased from 0.20 preoperation to 0.44 postoperation; ROM: group A decreased postoperatively to (22.6 ± 3.3)° from (39.5 ± 6.1)° while group B decreased postoperatively to (22.9 ± 3.7)° from (39.3 ± 6.7)°. When Groups A and B were compared, bone fusion between allograft and spinous processes was completed in 73.1% vs 64.2%, partial fusion in 22.4% vs 18.7% and failed in 6.3% vs 17.1%.
  
  
  CONCLUSIONS
  Uses allogenic and Ostetic artificial bones in double door laminoplasty may achieve an excellent decompression of spinal cord. But the application of allogenic bone yields a higher bone fusion rate after surgery.
authors.affiliation: Department of Spinal Surgery, Peking University People's Hospital, Beijing 100044, China.
authors.forename: Zhen-qi
authors.initials: ZQ
authors.lastname: Zhu
authors.forename: Hai-ying
authors.initials: HY
authors.lastname: Liu
authors.forename: Ri-le
authors.initials: RL
authors.lastname: Ge
authors.forename: Ya-long
authors.initials: YL
authors.lastname: Qian
authors.forename: Bo
authors.initials: B
authors.lastname: Wang
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D016025:Bone Transplantation / Q000295:instrumentation* / Q000379:methods; D002574:Cervical Vertebrae; D005260:Female; D006801:Humans; D007796:Laminectomy / Q000379:methods*; D008297:Male; D008875:Middle Aged; D049329:Nanostructures; D019736:Prostheses and Implants; D013130:Spinal Stenosis / Q000601:surgery*; D014184:Transplantation, Homologous; D016896:Treatment Outcome