title: [Experimental study on the extent of injured blood vessels in an avulsion amputation model].
abstract: OBJECTIVE
  To measure the length and extent of the injured blood vessels in an avulsion amputation model.
  
  
  METHODS
  Twenty rabbits were randomly divided into 2 groups. Group A was a sharp amputation group, and group B was an avulsion amputation group. The length and extent of the injured blood vessel was observed with naked eye, operation microscope and electron microscope, and the limbs were replanted. Group A and B were explored at three days and ten days after the replantation respectively. The patency rate and healing process were compared.
  
  
  RESULTS
  All the severed ends of vessels in group A were neat with almost the same injured range in the three layers of the vessel wall about 1 mm away from the severed end. The vessels of group B were damaged seriously, the endothelial cells were deleted. The "jumping-like" damage could be observed in the elastic fibers. The injury of 2 to 3 mm away from the normal vessel wall could be observed by operation microscope.
  
  
  CONCLUSIONS
  The damage of avulsion amputation vessels was irregular, 2 to 3 mm or more tissues should be excised under the microscope in the process of operation in order to ensure the healthy intact blood vessel walls.
authors.affiliation: Department of Orthopedic Surgery, First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang, P. R. China 150001.
authors.forename: J
authors.initials: J
authors.lastname: Shang
authors.forename: X Y
authors.initials: XY
authors.lastname: Zhang
authors.forename: Z G
authors.initials: ZG
authors.lastname: Bi
mesh_terms: D000673:Amputation, Traumatic / Q000601:surgery*; D000818:Animals; D001916:Brachial Artery / Q000293:injuries* / Q000601:surgery*; D004195:Disease Models, Animal; D005263:Femoral Artery / Q000293:injuries / Q000601:surgery; D008297:Male; D011817:Rabbits; D011897:Random Allocation; D012092:Replantation