Abstract
Recent studies have established that generalized loss of trabecular bone occurs in the growing rat following day-to-day inflammatory irritation for a period of 3 wk. We can now demonstrate that there are similar effects on bone in milder but more prolonged chronic inflammation (14 wk). Thus, there were significant decreases in trabecular bone mass as well as in cortical bone after weekly subcutaneous injections or implantations of nonspecific irritants. Osteopenia, induced by a single but extensive inflammatory lesion, remained apparent even 14 wk after induction. This indicates that inflammation-mediated osteopenia is at least incompletely reversible. A less pronounced but similar reduction of cortical and trabecular bone was observed in rats following sham operation. This might be of importance in all animal studies on bone metabolism that include surgical procedures.
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