Femoral stems offer contrasting gains in bone mineral density after THA
Recently published data showed contrasting gains in bone mineral density following total hip arthroplasty based on whether the patient received the SR71 metal-carbon fiber composite femoral stem or an all-metal stem.
Researchers enrolled and randomly assigned 60 patients to undergo total hip arthroplasty (THA) with either the uncemented SR71 stem or an all-metal stem. All of the patients received a cemented all-polyethylene acetabular component and a 28-mm metal femoral head. Of the 55 patients who were available for analysis 3 years postoperatively, the researchers followed-up with 41 patients for 10 years. HHS and VAS values, along with bone mineral density and radiographic analysis, were noted in both cohorts throughout the follow-up period.
Although significantly greater proximal bone mineral density increases from baseline were observed in the SR71 stem cohort than in the all-metal group, the inverse of this trend was found when examining distal bone mineral density. No significant differences in HHS or VAS values were found, according to the researchers.
Progressive migration of an acetabular component and revision were each observed in one patient with an SR71 stem, whereas bone resorption was noted in one patient from the all-metal cohort.
Disclosure: Bennett has no relevant financial disclosures to report. Please see the full study for all other authors’ relevant financial disclosures.