Objective To analysis the MRI measured pre collapse osteonecrosis of the hip cartilage thickness and apparent diffusion coefficient. Methods 60 cases of hospital from 2013 January to 2015 1 menstrual imaging diagnosis for early avascular necrosis of femoral collapse in patients, as well as the study group (60 cases); at the same time, 60 cases of pelvic scan without hip symptoms non avascular necrosis of the femoral head in adults, as the control group (60 cases); MRI measurement for the two clinical groups avascular necrosis of the femoral head collapse, in patients with hip cartilage thickness and the apparent diffusion coefficient (ADC), for the prediction of femoral head collapse to improve the observation index. Results two groups of MRI measurement, in avascular necrosis of the femoral head collapse early in the study group, the control group of normal adult articular cartilage mean ADC (10.89±1.66)×10-5mm2 /s, the thickness of articular cartilage; articular cartilage of group mean ADC (15.23±4.72)×10-5mm2 /s, stage of hip the thickness of articular cartilage was 1.2mm, two groups of cartilage thickness and apparent diffusion coefficient are different, the study group compared with the control group, with statistical significance (P<0.05). Conclusion In the clinical diagnosis of femoral head necrosis, measurement of articular cartilage using MRI thickness, apparent diffusion coefficient, on articular cartilage of sensitive reaction, can effectively predict the early avascular necrosis of the femoral head collapse, and provide reference standard for clinical diagnosis of articular cartilage lesions.