title: Compositional variation of fibrous callus and joint cartilage in different internal environments.
abstract: OBJECTIVE
  To evaluate the compositional variation of fibrous callus in the fracture site and the joint cavity and joint cartilage after being transplanted in the muscle pouch.
  
  
  METHODS
  Thirty 2 month old New Zealand white rabbits (weighing 1-1.5 kg) were randomly divided into two groups: a callus transplantation group (Group A, n=15) and a cartilage transplantation group (Group B, n=15). In Group A, closed radius fracture was made and the autologous fibrous callus was transplanted in the right knee joint cavity at 12 days postoperatively. In Group B, the right knee joint cartilage of the animals was transplanted in the autologous back muscle pouches under anesthesia. Then all the animals were killed by overdose anesthetic 3 weeks after transplantation. And the transplanted fibrous callus, the healed bones in the fracture sites and the transplanted joint cartilage were obtained for assessment of compositional variation.
  
  
  RESULTS
  Pure fibrous composition was found in the callus at the fracture sites in Group A at 12 days postoperatively. And for 11 out of the 15 animals, the fibrous callus was transformed into cartilaginous tissues after 3 weeks of transplantation, but the fibrous callus was absent in the other 4 animals. The fibrous calluses at the original site and the fracture locus were differentiated into bony tissues. Bony tissue transformation was found in the transplanted joint cartilages in the muscle pouch of all the animals in Group B.
  
  
  CONCLUSIONS
  The fracture sites or joint cavity may facilitate callus differentiation in different ways: the former is helpful for osteogenesis while the latter for the development and maintenance of cartilages, and the muscle pouch is inclined to induce the osteogenic phenotype for cartilages.
authors.affiliation: Department of Orthopedics, Xijing Hospital, Fourth Military Medical University, Xioan 710032, China.
authors.forename: Xiao-tang
authors.initials: XT
authors.lastname: Sun
authors.forename: Yun-yu
authors.initials: YY
authors.lastname: Hu
authors.forename: Li
authors.initials: L
authors.lastname: Zhao
authors.forename: Rong
authors.initials: R
authors.lastname: Lü
authors.forename: Jun
authors.initials: J
authors.lastname: Wang
authors.forename: Jian-ping
authors.initials: JP
authors.lastname: Bai
mesh_terms: D000818:Animals; D002146:Bony Callus / Q000166:cytology* / Q000637:transplantation; D002358:Cartilage, Articular / Q000166:cytology* / Q000637:transplantation; D002454:Cell Differentiation; D017102:Fracture Healing / Q000502:physiology*; D007719:Knee Joint; D008297:Male; D018482:Muscle, Skeletal; D011817:Rabbits; D011885:Radius Fractures / Q000503:physiopathology*