D significantly decreased and Tb.Th significantly increased over time as a result of aging. Cortical thickness and polar moment of inertia in the metaphysis and diaphysis Cortical thickness and the polar moment of inertia in the metaphysis did not significantly change within the 8 weeks after OVX compared to the SHAM group (Fig. 4).

PTH this website treatment led to a sharp linear increase in cortical thickness and pMOI, which were both significantly different from the OVX group over time. Visual inspection of registered images of weeks 8 and 14 showed that bone formation was slightly more due to endosteal than periosteal apposition ABT-737 in vitro and that bone formation did not take place on all parts of the surface in the same degree (Fig. 5). Fig. 4 Cortical thickness and polar moment

of inertia (pMOI) in the meta- and diaphysis of the tibia for all groups at all time points (mean ± standard deviation) Fig. 5 Registered images of metaphyseal (left) and diaphyseal (right) cortical bone taken at weeks 8 and 14 showing bone formation during 6 weeks in the cortex of a PTH-treated rat. Gray is bone at week 8, black is newly formed bone Cortical thickness in the diaphysis increased after OVX almost reaching significance (p = 0.07). PTH treatment led to an even sharper increase, which was linear over time and significantly different from the untreated group. The pMOI increased significantly after OVX in the first 8 weeks. After 8 weeks, this increase waned in the OVX group, while it increased significantly more in the PTH-treated 4EGI-1 group. Visual inspection of registered images of weeks 8 and 14 showed that bone formation was slightly more due to periosteal than endosteal apposition and that bone formation had taken place quite evenly over the Glycogen branching enzyme whole surface. Cortical thickness and pMOI significantly and gradually increased over time in the metaphysis and the diaphysis of the SHAM group as a result of aging. Mineralization of meta- and epiphyseal trabecular bone tissue and meta- and diaphyseal cortical bone tissue At the start of the experiment, CT-estimated bone mineral density

in the metaphyseal trabecular and cortical bone tissue was significantly higher in the SHAM group than in the other groups. However, because of the use of follow-up data and repeated measures design, we were still able to determine significant effects of OVX and PTH on bone mineral density. Compared to SHAM, OVX was found to lead to a significantly lower increase in mineral density of meta- and diaphyseal, cortical bone tissue over the first 8 weeks, but did not significantly affect trabecular bone tissue (Fig. 6). Over weeks 8 to 14, the meta- and epiphyseal trabecular bone tissue of the PTH group was found to have a significantly more increasing bone mineral density than that of the OVX group. Cortical bone mineral density was not affected by PTH treatment. Bone mineral density of all measured bone areas was found to significantly increase over time in the SHAM group. Fig.