Fig. 2

a The pelvic radiograph shows the inward depression of the hips with narrowing joint space. b A pelvic radiograph shows that the right femoral head and the left femoral head cave through the acetabular wall and exceeds Kohler's line by 1.49 cm and 1.42 cm, respectively. c. The CT scan indicate that the hip joints is obviously sunken, the right femoral antetorsion is about 35 degrees, and the lift side is about 30 degrees. d. The three-dimensional CT shows the structure of the hip joints. e. The coronal and transverse magnetic resonance imaging indicate normal signals of femoral head and no signs of femoral head necrosis. f The surgical marker diagram illustrates that the vertex of the greater trochanter of the hip joint is denoted 0, parallel lines are made up and down, with an average interval of 2 cm between each line