title: [Anterior lumbar interbody fusion of canine with allograft cortical ring plus autogenous cancellus].
abstract: OBJECTIVE
  To prove the biological characteristics of spinal intervertebral fusion with allograft cortical ring plus autogenous cancellus from iliac bone (called as composite ring).
  
  
  METHODS
  Eight hybrid dogs were adopted in the study. The composite ring and autogenous tri-cortical blocks were implanted into the intervertebral space of dogs respectively. The intervertebral discs were removed before implantation. The fusion segments were evaluated by x-ray, histological examinations at 1, 2, 4 and 6 months after operation to compare the healing status of two implants.
  
  
  RESULTS
  The X-ray film and histological examination showed the lumbar interbody was fused after 4 months of operation in composite ring group, while the autogenous iliac bone blocks fused with peripheral bone tissue after 6 months of operation. Composite ring healed more quickly and completely, showed different osteogenesis behavior compared with that of massive allografts.
  
  
  CONCLUSIONS
  Composite ring can promote the fusion of intervertebral body and can be used as a potential material for spinal surgery.
authors.affiliation: Department of Orthopedic Surgery, Chinese PLA General Hospital, Beijing, P. R. China 100083.
authors.forename: W Z
authors.initials: WZ
authors.lastname: Bi
authors.forename: J F
authors.initials: JF
authors.lastname: Wang
authors.forename: S B
authors.initials: SB
authors.lastname: Lu
mesh_terms: D000818:Animals; D016025:Bone Transplantation / Q000379:methods*; D004285:Dogs; D017102:Fracture Healing; D007085:Ilium / Q000637:transplantation; D008159:Lumbar Vertebrae / Q000000981:diagnostic imaging / Q000601:surgery*; D010012:Osteogenesis; D011859:Radiography; D013123:Spinal Fusion / Q000379:methods*