[General and light microscope observation on histological changes of femoral heads between SANFH rabbit animal models and it were intervened by Osteoking].
OBJECTIVE
To evaluate the histological changes on the femoral heads of the SANFH rabbit animal models and after it were intervened by Osteoking (herbs of the Yi minority in Yunnan province) using general and light microscope observation.


METHOD
A total of 150 New Zealand white rabbits were randomly divided into a non-treatment control group (A group, n = 24), normal rabbits with Osteoking treatment group (B group, n = 24), and the experimental group (n = 102). The experimental group was injected with escherichia coli endotoxin (10 microg x kg(-1)) into auricular vein twice by 24-hour intervals, and prednisolone (20 mg x kg(-1)) was injected into buttock three times by 24-hour intervals to make steroid-induced femoral head necrosis model. At the fifth week, 48 out of 53 rabbits were equally divided into model group (C group, n = 24, models with non-treatment Osteoking) and abnormal rabbits with Osteoking treatment group (D group, n = 24). B group and D group were intragastrically administrated with Osteoking, once every two days. A group and C group were intragastrically administrated with the equal volume of saline. At 8th, 12th and 16th week after model preparation, the femoral head specimens were observed under the general and a light microscope.


RESULT
Macroscopic and light microscopic analysis showed that, clear bone necrosis of femoral head was observed in the C group, and a large number of fat cell proliferation was found in the bone marrow cavity. As compared with C group, the damage level of cells in D group was milder, however, the density of bone trabecula from Osteoking treatment was high, and the ratio of bone lacuna was very low. It is also demonstrated that the surface area of bone necrosis was decreased, and the number of cells from adiposities was reduced significantly. The phenomenon of bone necrosis repaired apparently. The morphology of femoral head from A group and B group is normal.


CONCLUSION
It suggested that Osteoking could effectively help repair steroid-induced femoral head necrosis in the early stage.