TY - JOUR
T1 - Development of a bone nonunion in a noncritical segmental tibia defect model in sheep utilizing interlocking nail as an internal fixation system
AU - Lozada-Gallegos, Angel R.
AU - Letechipia-Moreno, Jorge
AU - Palma-Lara, Icela
AU - Montero, Aldo Alessi
AU - Rodríguez, Gerardo
AU - Castro-Muñozledo, Federico
AU - Cornejo-Cortés, Miguel A.
AU - Juárez-Mosqueda, M. Lourdes
N1 - Funding Information:
This work was supported by CONACyT Grant number 2003-C01-90 .
PY - 2013/8
Y1 - 2013/8
N2 - Background: The bone nonunion is an important complication of bone fracture repair. The existing models developed on small animal species prevent using osteosynthesis materials designed to be implanted in human bones. The goal of this study was to develop a nonunion process in a noncritical segmental tibial defect in sheep, a species analogous in size to humans. Materials and methods: The animals were divided into two groups of four animals each. In Group 1 (experimental), the defect was created by surgically stripping the periosteum from the edges of a distal tibial osteotomy, keeping the edges 5 mm apart, and placing an incomplete O-shaped silicone ring in the gap. Group 2 (control) was intervened with a simple fracture at the distal end of the tibia. In both groups an interlocking nail was used as a fixation system. Over 8 wk after surgery, radiographs and histologic and histomorphometric analyses were performed. Results: The control group showed a typical bone repair process. In contrast, the experimental group showed a fracture line with rounded edges and a scarce callus formation. The bone callus showed reduced amount of bone formation and large content of fibrous tissue (P = 0.001). Conclusions: These results indicate that our model developed an atrophic nonunion in sheep, a species having multiple similarities to humans, such as weight, size, bone structure, and bone remodeling process.
AB - Background: The bone nonunion is an important complication of bone fracture repair. The existing models developed on small animal species prevent using osteosynthesis materials designed to be implanted in human bones. The goal of this study was to develop a nonunion process in a noncritical segmental tibial defect in sheep, a species analogous in size to humans. Materials and methods: The animals were divided into two groups of four animals each. In Group 1 (experimental), the defect was created by surgically stripping the periosteum from the edges of a distal tibial osteotomy, keeping the edges 5 mm apart, and placing an incomplete O-shaped silicone ring in the gap. Group 2 (control) was intervened with a simple fracture at the distal end of the tibia. In both groups an interlocking nail was used as a fixation system. Over 8 wk after surgery, radiographs and histologic and histomorphometric analyses were performed. Results: The control group showed a typical bone repair process. In contrast, the experimental group showed a fracture line with rounded edges and a scarce callus formation. The bone callus showed reduced amount of bone formation and large content of fibrous tissue (P = 0.001). Conclusions: These results indicate that our model developed an atrophic nonunion in sheep, a species having multiple similarities to humans, such as weight, size, bone structure, and bone remodeling process.
KW - Bone nonunion
KW - Interlocking nail fixation
KW - Large animal model
KW - Noncritical segmental defect
KW - Sheep
UR - http://www.scopus.com/inward/record.url?scp=84880293484&partnerID=8YFLogxK
U2 - 10.1016/j.jss.2013.02.060
DO - 10.1016/j.jss.2013.02.060
M3 - Artículo
SN - 0022-4804
VL - 183
SP - 620
EP - 628
JO - Journal of Surgical Research
JF - Journal of Surgical Research
IS - 2
ER -