Fig. 1

A 54-year-old male patient with aseptic prosthesis loosening 17 years after THA. a Preoperative x-ray showed paprosky type IIIB acetabular bone defect in left hip. b Intraoperative image showed remnant structures of the Harris fossa and acetabular notches. a, b point represented the remnant of acetabular notches. The white curve represented the remnant of Harris fossa. The acetabular center was located at 25 mm above the perpendicular bisector of acetabular anterior and posterior notch line. c Sclerous acetabular bone bed was concentrically reamed using the above located point as the center of circles. Impaction bone graft was used to reshape the acetabulum. d New acetabulum was reconstructed by impaction bone graft. e The acetabular enhancement cup was installed. f Median gluteal muscle insertion site was reconstructed, and the proximal femur was reconstructed by structural bone graft. g Postoperative x-ray showed hip rotation center was restored. h Ten years follow-up x-ray showed vertical and horizontal acetabular migration were 3.6 mm and 2.8 mm respectively