Hamdy Reggie C, Amako Masatoshi, Beckman Lorne, Kawaguchi Masahisa, Rauch Frank, Lauzier Dominique, Steffen Thomas
Shriners Hospital for Children, Canadian Unit, Division of Orthopaedics, McGill University, 1529 Cedar Avenue, Montreal, Quebec, Canada H3G 1A6.
Bone. 2003 Aug;33(2):248-55. doi: 10.1016/s8756-3282(03)00154-6.
In this study we tested the effect of locally applied osteogenic protein 1 (OP-1) on distraction osteogenesis in rabbits. Seven days after tibial osteotomy, distraction was started at a rate of 0.25 mm per 12 h for 3 weeks. At the end of the distraction period, OP-1 was injected at the site of osteotomy. Four different dosages were tested (0, 80, 800, or 2000 microg; eight rabbits per dose group). Rabbits were sacrificed 3 weeks later, and histologic, densitometric, and biomechanical parameters were assessed. No significant differences were found between groups for any parameter. To explain why this approach was only modestly successful, the expression of BMP receptor protein in the newly formed tissue was analyzed by immunohistochemistry. Strong expression of BMP receptor IA, IB, and II was found during the early distraction phase, but not during later stages of the process. Thus, it appears that the lack of receptor protein in the target tissue impairs the effect of OP-1 given at the end of the distraction period. Possibly, OP-1 could be more useful when applied early in the distraction phase.
