Ortopedi
Ortopedi
Ortopedi
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
23-27 oktober 2006 Vitenskapelige forhandlinger Abstrakt nr: 228<br />
BONE DEGENERATION AND RECOVERY AFTER BISPHOSPHONATE<br />
TREATMENT OF OVARIECTOMIZED WISTAR RATS<br />
Huiskes R, Brouwers JEM, van Rietbergen B.<br />
Eindhoven University of Technology, Dept. Biomedical Engineering<br />
Den Dolech 2, WH 4.131, P.O. Box 513, 5600 MB Eindhoven, The Netherlands<br />
Introduction: Recently developed in vivo micro-CT scanners offer the possibility to study<br />
changes in bone microstructure in rats. Bisphosphonates are commonly used to treat<br />
osteoporosis. It is not well understood, however, what the influence of the time-point of<br />
treatment is. Therefore, the aim of this study was to determine the influence of early and late<br />
zoledronate treatment on the bone in ovariectomized rats using in vivo micro-CT.<br />
Methods and Materials: 29 female, Wistar rats were divided into an ovariectomy group<br />
(OVX, 5 rats), OVX and zoledronate (ZOL) at week 0 (8 rats), OVX and ZOL at week 8 (7<br />
rats) and a SHAM group (9 rats). CT-scans were made of the proximal tibia at weeks 0, 2, 4,<br />
8, 12 and 16, and bone structural parameters were determined in the metaphysis. An ANOVA<br />
and Bonferroni test compared the percentage changes at week 16 between all groups. A paired<br />
student t-test determined if bone microstructure significantly improved after ZOL treatment in<br />
the late ZOL group.<br />
Results: At week 16, all groups were significantly different from each other for BV/TV,<br />
Conn.D and Tb.N, except for the early ZOL and control groups, which were not significantly<br />
different for any structural parameter. After ZOL treatment at week 8, BV/TV, SMI, Tb.N and<br />
Tb.Th significantly improved in the late ZOL group.<br />
Discussion: Early ZOL treatment inhibited all bone microstructural changes seen after OVX.<br />
Late ZOL treatment significantly improved bone microstructure, although the structure did<br />
not recover to SHAM level. Early ZOL treatment was significantly better than late treatment,<br />
however, late treatment was still significantly more favorable than no treatment at all,<br />
indicating that the time-point of bisphosphonate treatment may be important.