Rat model of distraction osteogenesis

Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society
J AronsonC K Lumpkin

Abstract

Prior studies of distraction osteogenesis in dog and rabbit models have shown predominantly intramembranous bone formation. Other models of fracture healing normally display mixtures of both endochondral and intramembranous bone formation. We have established a rat model of tibial lengthening that reliably reproduces the pattern of zonal osteogenesis previously observed in dog and rabbit models. A distraction rate of 0.25 mm twice a day with a 0-day latency period produced intramembranous bone with zones of progressive mineralization from collagen. With this protocol, rats bridged the distraction gap with a 25% increase in the tibial bone length. After 20 days of distraction and 50 days of consolidation, the three-point bending stiffness, as a percentage of the contralateral control, reached a level equivalent to that measured in the canine model for a 15% lengthening (28-day distraction and 84-day consolidation). Radiodensitometric analysis of the regenerate bones measured 97% of the unaffected contralateral tibial densities, and mineral analyses demonstrated that calcium and phosphorus levels in the regenerate bone reached 78% of contralateral tibial levels by day 70. We concluded that a rat model of distraction osteogenesis ...Continue Reading

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Jun 7, 2007·Calcified Tissue International·Hironori MatsuzakiMatthew J Silva
May 3, 2001·Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society·J AronsonC K Lumpkin
Jun 12, 2001·Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society·J AronsonC K Lumpkin
Jan 10, 2002·Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society·T E RadomisliM G Ehrlich
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