Fig. 4

H&E staining (× 4) of trabecular bone and differences among the groups. a Trabecular bone in the FNF group appeared to be thicker and more integrated, the arrangement was more regular. However, trabecular bone in the OA group appeared to be slightly thinner and rupture of trabecular bone can be seen but was not quite common. Arrangement of trabecular bone in the ONFH group appeared to be disorganized and rupture was widespread. b Quantitative results showed the percentage of trabecular bone in H&E staining among the groups. Data were expressed as mean ± SD; N = 10 specimens/group. Bar = 100 μm. *p < 0.05 versus FNF group, #p < 0.05 versus OA group (by one-way ANOVA and Tukey’s post hoc test)