Custom-made aMace acetabular implants in Paprosky type 3B defects: a case series of 5 patients with a follow-up of 6 to 10 years

Total hip replacement revision surgery has become increasingly prevalent in today's society. This causes issues since, for each revision surgery, the quantity of accessible bone stock decreases and the complexity of surgery increases. As a result, readily available implants may not always address the patient's individual demands. For those patients, custom- made implants may be a feasible option. This paper is a retrospective cohort-analysis of 5 patients who received an aMace custom-made acetabular implant produced by Materialise, placed by a single surgeon. At the time of writing, we conducted a cross-sectional cohort analysis of patients who received this custom-made acetabular implant between 2014 and 2016. The mean follow-up time of 5 patients was 7.8 years (range: 6.3 - 10.6 years). All patients achieved excellent outcomes; there were no implant failures or known adverse events. Radiographic images demonstrate significant implant ingrowth with no signs of loosening. All patients expressed satisfaction and withheld no to minor complaints. Harris Hip Score (HHS) values ranged between 70.7 and 99.5, with a mean score of 85.6. The aMace custom-made acetabular implant is a feasible option in patients with severe acetabular defects undergoing revision arthroplasty. At this moment, the primary issues are the cost of the cup and the reimbursement criteria.