title: [Preliminary investigation of animal model of tibial defection fracture made by drilling hole method ].
abstract: OBJECTIVE
  To compare the differences in damage degree, healing time and healing process between two animal models of defection fracture and provide the research data for the establishment of a new animal model.
  
  
  METHODS
  Sixty male SPF Spragur-Dawley rats were divided randomly into control group, sawing group and drilling hole group, with 20 rats in each group. Animals of drilling hole group were treated with hone drill and made an 1 mm hole on tibial plateau animals of sawing group were treated with saw and made an 3 mm defection on tibial plateau; nothing to do in animals of control group. The rats were respectively killed at 2nd, 4th weeks after operation, bone density, bone ash quantity, contents of bone Ca, P were detected.
  
  
  RESULTS
  At the 2nd week after operation, bone density, bone ash quantity, contents of bone Ca, P in drilling hole group and sawing group were significantly lower than that of the control group (P < 0.05 or P < 0.01). Two animal models of drilling hole group and sawing group were similar in X-ray films and pathology investigations. At the 4th week after operation, there were no significant defference in bone density and bone ash quantity among three groups (P > 0.05). Rats of sawing group showed more poroma and inflammatory infiltration in histological examination.
  
  
  CONCLUSIONS
  Drilling hole method and sawing method could be used to make animal model of defection fracture, two methods showed similar damage degree, healing time and healing process, hut drilling hole method have advantages of simple operation, easily control damage degree and less inflammatory infiltration and bone disunion.
authors.affiliation: Wangjing Hospital, China Academy of Chinese Medical Sciences, Beijing 100700, China.
authors.forename: Wan-Qiang
authors.initials: WQ
authors.lastname: Zhang
authors.forename: Jian-Qing
authors.initials: JQ
authors.lastname: Liu
authors.forename: Xuan
authors.initials: X
authors.lastname: Wang
authors.forename: Hai-Xia
authors.initials: HX
authors.lastname: Tian
authors.forename: Zhen
authors.initials: Z
authors.lastname: Wang
authors.forename: Qing-Hui
authors.initials: QH
authors.lastname: Song
authors.forename: Jia
authors.initials: J
authors.lastname: Zhu
authors.forename: Yuan
authors.initials: Y
authors.lastname: Ma
authors.forename: Hong-Pu
authors.initials: HP
authors.lastname: Zhao
mesh_terms: D000818:Animals; D015519:Bone Density; D004195:Disease Models, Animal; D008297:Male; D051381:Rats; D017207:Rats, Sprague-Dawley; D013977:Tibia / Q000473:pathology; D013978:Tibial Fractures / Q000209:etiology*