Treatment study of distal femur for parathyroid hormone (1-34) and beta-tricalcium phosphate on bone formation in critical-sized defects in osteopenic rats

摘要

The objective of this study was to evaluate the effect of following combined treatment with parathyroid hormone (1-34) (PTH) and beta-tricalcium phosphate (beta-TCP) on local bone formation in a rat 3-mm critical-sized defect at the distal femur. Fourteen weeks were allowed to pass before defect surgery for the establishment of osteopenic animal models chronically fed a low-protein diet. All animals were randomly divided into four groups: group PTH; group beta-TCP, group PTH + beta-TCP, and a control group. All rats then underwent a surgical procedure to create bone defects in the bilateral distal femurs, and beta-TCP was implanted into critical-sized defects for the groups designated as beta-TCP and group PTH + beta-TCP. After the defect operation, all animals from group PTH and group PTH + beta-TCP received following subcutaneous injections with PTH (60 mu g/kg, three times per week) until euthanasia at 4 and 8 weeks. The distal femurs and blood were collected for evaluation. The results of study showed the strongest effect on accelerating the local bone formation with treatment beta-TCP and PTH at 4 weeks and 8 weeks. The results from our study demonstrate that a combination of PTH and beta-TCP had an additive effect on local bone formation in osteopenic rats chronically fed a low-protein diet. (C) 2015 European Association for Cranio-Maxillo-Facial Surgery. Published by Elsevier Ltd. All rights reserved.