%0 Journal Article
%T Changes in periacetabular bone mineral density five years after resurfacing hip arthroplasty versus conventional total hip arthroplasty
%A Davey MJM Gerhardt
%A Elisabeth A Roovers
%A Job LC van Susante
%A Jos谷 MH Smolders
%A Ton AJM Rijnders
%J HIP International
%@ 1724-6067
%D 2019
%R 10.1177/1120700018808023
%X We studied whether acetabular bone mineral density (BMD) is better preserved after resurfacing hip arthroplasty (RHA) versus small diameter metal-on-metal total hip arthroplasty (THA). This randomised controlled trial included 82 patients. BMD was measured in 5 periprosthetic regions of interest (ROI) with dual-energy absorptiometry (DEXA) preoperatively, at 3 and 6ˋmonths, 1, 2, 3 and 5ˋyears postoperative. 34 RHA and 26 THA had a complete 5ˋyears follow-up. 1 RHA and 1 THA were revised due to pseudotumour formation, 2 THA were revised because of recurrent dislocations and 1 RHA for avascular necrosis. Overall an initial decrease in BMD was observed for both implants, stabilising after 2ˋyears. 5ˋyears after RHA a BMD change of +1% in upper cranial, 每4% (p < 0.01) in cranial, 每8% (p < 0.01) in craniomedial, 每7% (p < 0.01) in medial and +4% in caudal ROI compared to baseline values was seen. 5ˋyears after THA a BMD change of 每3% (p = 0.01), 每13% (p < 0.01), 每21% (p < 0.01), 每11% (p < 0.01) and 每2% for each respective ROI. The observed BMD decrease in different regions was structurally favouring the RHA-cup, with significantly higher levels in the cranial and craniomedial ROI. Acetabular BMD is better preserved behind a rigid press-fit convex cup in RHA compared to a titanium threaded cup in conventional THA in the cranial and craniomedial ROI. Despite of a theoretical higher stress-shielding behind the stiff acetabular component in RHA, compared to the more elastic threaded titanium THA-cup, bone depletion behind the RHA component does not seem to be of major concern. EudraCT (2006-005610-12
%K Acetabulum
%K bone mineral density
%K metal-on-metal
%K randomised controlled trial
%K resurfacing hip arthroplasty
%K total hip arthroplasty
%U https://journals.sagepub.com/doi/full/10.1177/1120700018808023