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
DOI:
https://doi.org/10.1080/17453674.2020.1802682Abstract
Background and purpose — Despite the good results after total hip arthroplasty (THA), new implants are continu- ously 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 fea- tures of the BM stem, but minor changes in the design might improve the clinical performance. We compared the migra- tion 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 sig- nificant 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 respec- tively), 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.
Downloads
Downloads
Published
How to Cite
Issue
Section
License
Copyright (c) 2020 Karen Dyreborg, Mikkel R Andersen , Nikolaj Winther, Søren Solgaard, Gunnar Flivik, Michael M Petersen
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.