title: [Comparative study on early revascularization of membranous and endochondral onlay bone grafts in the rat].
abstract: OBJECTIVE
  To investigate the disparity in early revascularization of the membranous and endochondral bone grafts.
  
  
  METHODS
  Twenty Wistar rats were randomly divided into two groups of 10 each. Full-thickness cranial (membranous) and split-thickness iliac crest (endochondral) onlay bone grafts were placed subperiosteally onto the snout of the animal without bony fixation. At 7 and 14 days after grafting the bone grafts together with the recipient sites were harvested. Revascularization was studied utilizing opacifying injection and computerized image analysis technique.
  
  
  RESULTS
  The extent of vascularization at 7 days was 11.88% and 22.33% in membranous and endochondral bone grafts, respectively, and they developed to be 15.93% and 34.93% at 14 days, respectively.
  
  
  CONCLUSIONS
  The results indicated that endochondral bone grafts were more rapidly revascularized than membranous bone grafts at 7 and 14 days (P < 0.05). Differences in graft architecture are theorized to account for the relationship between the vascularization and volume maintenance in the bones of different embryonic origin.
authors.affiliation: Plastic Surgery Hospital of Chinese Academy of Medical Sciences, Beijing 100041.
authors.forename: B
authors.initials: B
authors.lastname: Yang
authors.forename: M
authors.initials: M
authors.lastname: Zhao
authors.forename: Z
authors.initials: Z
authors.lastname: Liu
mesh_terms: D000818:Animals; D016025:Bone Transplantation / Q000379:methods*; D007568:Jaw / Q000098:blood supply; D056948:Orthognathic Surgical Procedures; D010521:Periosteum / Q000601:surgery; D011897:Random Allocation; D051381:Rats; D017208:Rats, Wistar; D012886:Skull / Q000637:transplantation*