Migration of the uncemented Echo Bi-Metric and Bi-Metric THA stems : a randomized controlled RSA study involving 62 patients with 24-month follow-up

Background and purpose — Despite the good results after total hip arthroplasty (THA), new implants are continuously being developed to improve durability. The Echo Bi-Metric (EBM) THA stem is the successor to the Bi-Metric (BM) THA stem. The EBM stem includes many of the features of the BM stem, but minor changes in the design might improve the clinical performance. We compared the migration behavior with radiostereometric analysis (RSA) of the EBM stem and the BM stem at 24 months and evaluated the clinical outcome. Patients and methods — We randomized 62 patients with osteoarthritis (mean age 64 years, female/male 28/34) scheduled for an uncemented THA to receive either an EBM or a BM THA stem. We performed RSA within 1 week after surgery and at 3, 6, 12, and 24 months. The clinical outcome was evaluated using Harris Hip Score (HHS) and Oxford Hip Score (OHS). Results — At 24 months, we found no statistically significant differences in migration between the two implants. During the first 3 months both the EBM and the BM stems showed visible subsidence (2.5 mm and 2.2 mm respectively), and retroversion (2.5° and 2.2° respectively), but after 3 months this stabilized. The expected increase in HHS and OHS was similar between the groups. Interpretation — The EBM stem showed a migration at 24 months not different from the BM stem, and both stems display satisfying clinical results.

Andersen, Mikkel R.University of Copenhagen,Copenhagen University Hospital (author)
Winther, NikolajCopenhagen University Hospital,University of Copenhagen (author)
Solgaard, SørenGentofte Hospital (author)
Flivik, GunnarLund University,Lunds universitet,Forskningsgruppen för höft- och knäproteskirurgi,Forskargrupper vid Lunds universitet,The Hip and Knee Joint Arthroplasty Research Group,Lund University Research Groups,Skåne University Hospital(Swepub:lu)ort-gfl (author)
Petersen, Michael M.University of Copenhagen,Copenhagen University Hospital (author)
University of CopenhagenGentofte Hospital (creator_code:org_t)

In:Acta Orthopaedica: Medical Journals Sweden AB91:6, s. 693-6981745-36741745-3682

By the author/editor: Dyreborg, Karen; Andersen, Mikkel ...; Winther, Nikolaj; Solgaard, Søren; Flivik, Gunnar; Petersen, Michae ...

About the subject

MEDICAL AND HEALTH SCIENCES: MEDICAL AND HEAL ...; and Clinical Medicin ...; and Orthopaedics

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