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Objective: systematic analysis of four methods of comparing X-ray plain film , CT, ECT, MRI of avascular necrosis of the role of early diagnosis . Methods: goat 20 , the surgery caused one side of avascular necrosis of the model , the self-control of the other side then randomized after time , the four imaging method to check on a regular basis , and to cut specimens disease inspection . Analysis comparing four methods of avascular necrosis early assertion . Results: surgery caused avascular necrosis after 12 weeks , X-ray , CT, ECT, MRI four methods of experimental animals check , 18 times , 19 times , 20 times , 23 times , including abnormal number of positive results were changed four times , seven times , 15 times , 20 times , the positive rate was 22.2% , 36.8% , 75.0% , 86.9% , R × C table data X to 2 test , P <0.05 , The four difference was statistically significant. Conclusion: In this experiment four image the method of experimental avascular necrosis of the role of early diagnosis , MRI ( positive rate of 86.9% ) , followed by ECT ( 75.0% ) , CT (36.8 % ) , X-ray (22.2%) .
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