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BACKGROUND: The dynamic computational model of artificial hip joints can effectively simulate the dynamic separation of femoral head and acetabular cup and explore edge contact between the head and cup. OBJECTIVE: To study the effect of the femoral head diameter on the edge load under dynamic micro-separation of hip joints, to provide a basis for biomechanical analysis of ceramic hip joints corresponding to early high wear problems caused by edge loading, and provide theoretical analyses for hip prosthesis design and clinical application. METHODS: Using the previously validated method, the dynamic model of artificial hip joint for edge contact based on Adams dynamic simulation software was used to predict dynamic micro-separation and edge contact force in the gait cycle of the hip joint. RESULTS AND CONCLUSION: (1) The maximum contact force of the edge loading under micro-separation of the cup and femoral head slightly reduced as the femoral head size increased. (2) The severity of edge contact was computed as the product of the edge contact force and its acting time. The severity parameter of φ36 mm head was 0.6% larger than that of φ28 mm one. The parameter of diameter 55 mm hip was 2.7% larger than that of φ28 mm and φ36 mm heads. (3) The change of the ceramic hip femoral head size has negligible effect on the edge loading. [ABSTRACT FROM AUTHOR]