PMC9626995_01
Postoperative ventrodorsal radiographs of the left hip showing evidence of loosening with rotation (arrow) and medialization (arrowhead) of the acetabulum and cemented cup implant. (A) Immediately and (B) 16-month postoperative radiographs.
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F1
A micro total hip replacement (Biomedtrix, Boonton, NJ, USA) system with a #2 stem and 12-mm cup had been implanted, and cranial pole augmentation of the acetabulum was performed using PMMA bone cement with screw fixation (Figure 1A). Radiographs (Figure 1B) revealed severe bone loss and medialization of the medial acetabular wall.
Three-dimensionally printed pelvic bone and acetabular implant. Lateral (A) and medial (B) aspects of the cage. Two flanges provide screw holes to achieve initial fixation to the ilium and ischium (C). The medial side of the implant has a porous surface for long-term biological fixation.
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F2
The acetabular prosthesis produced by SLM 280HL (SLM Solutions GMbH, Germany) had bi-flanges with four cranial and one caudal screw hole, for fixation to the ilium and ischium (Figure 2).
Postoperative serial craniocaudal radiographs of the left hip with cage at subsequent follow-ups at (A) immediately postoperatively and (B) 5 months, (C) 15 months (D) 20 months, and (E) 39 months postoperatively. No evidence of loosening or change in implant position and gradual remodeling of medialized pelvic bone (arrow) can be observed on the radiographs.
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F3
Bone remodeling and stable position of both acetabular cage and polyethylene cup were noted on radiographic images with no evidence of loosening at 2, 5, 15, and 2 years after revision surgery (Figure 3).