Objective To investigate avascular necrosis in patients using MRI, spiral CT and DR comparative analysis of the three detection mode staging effect thereto, aims to summarize the early avascular necrosis imaging. Methods A retrospective analysis of our hospital in June 2012 to June 2015 for treatment of 86 cases of complete information in patients with ischemic necrosis of the femoral head (96 hips), all patients have to undergo hip joints MRI, spiral CT, DR Patterns on staging three detection, diagnosis and pathological diagnosis after surgery compared to analysis using statistical methods were compared among the three detection rate of positive ways. Results The positive rate of MRI diagnosis and diagnosis was 96.88% (93/96), the positive rate of spiral CT was 85.42% (82/96), the positive rate of DR detection and diagnosis was 66.67% (64/96). Therefore, MRI detection of avascular necrosis of the highest positive rate, followed by spiral CT, DR detection of the lowest positive rate, MRI, respectively, and spiral CT and DR detection positive rate compared to the difference was statistically significant (χ2= 64.46, P<0.01, χ2=59.63, P<0.01). Conclusion Avascular necrosis MRI, spiral CT and DR three detection modes, MRI detected highest positive rate, clinical staging avascular necrosis of great guiding significance, worthy of clinical promotion.