Aim To determine the effects of dexamethasone(Dex) by histomorphometry on rat humerus.Methods Thirty-seven cases of female SD rats were randomly divided into basal control group(B group),normal control group(C group was given physiological saline by intramuscular) and experimental groups [L,M and H group were given Dex(1.0 mg·kg-1) twice,four times and six times a week by intramuscular respectively for 30 days].The humerus was taken for bone histomorphometry after decalcification and paraffin-embedded.Resul...