Fig. 6

Illustrates postoperative multi-directional pelvic X-ray assessment, demonstrating precise execution of the following: Precise osteotomy, prosthesis placement, and multi-level screw fixation. Anteroposterior views of the pelvis reveal an accurate hip joint rotation center (indicated by red circle) and precise femoral head eccentricity in horizontal (L1 = L2) and vertical (L3 = L4) directions. The inlet view displays accurately positioned sacroiliac joint screws in the anterior–posterior direction, carefully avoiding the posterior vertebral canal (highlighted by the yellow circle, representing the safe vertebral region). Complete small pelvic ring reconstruction is indicated by the red dashed circle. The outlet view shows accurate sacroiliac joint screw placement, avoiding S1/S2 sacral foramina (indicated by the red dashed box). Ischium and pubic bone screws are precisely positioned for enhanced stability and support