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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

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@article{74e50da73f9049ba9aecffec859faf2f,
title = "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",
abstract = "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.",
keywords = "Arthroplasty, Replacement, Hip/adverse effects, Female, Femur/diagnostic imaging, Hip Prosthesis/adverse effects, Humans, Male, Middle Aged, Osteoarthritis, Hip/surgery, Outcome Assessment, Health Care, Prosthesis Design/adverse effects, Prosthesis Failure/etiology, Radiostereometric Analysis/methods",
author = "Karen Dyreborg and Andersen, {Mikkel R} and Nikolaj Winther and S{\o}ren Solgaard and Gunnar Flivik and Petersen, {Michael M}",
year = "2020",
month = dec,
doi = "10.1080/17453674.2020.1802682",
language = "English",
volume = "91",
pages = "693--698",
journal = "Acta Orthopaedica ",
issn = "1745-3674",
publisher = "Taylor & Francis Ltd",
number = "6",

}

RIS

TY - JOUR

T1 - Migration of the uncemented Echo Bi-Metric and Bi-Metric THA stems

T2 - a randomized controlled RSA study involving 62 patients with 24-month follow-up

AU - Dyreborg, Karen

AU - Andersen, Mikkel R

AU - Winther, Nikolaj

AU - Solgaard, Søren

AU - Flivik, Gunnar

AU - Petersen, Michael M

PY - 2020/12

Y1 - 2020/12

N2 - 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.

AB - 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.

KW - Arthroplasty, Replacement, Hip/adverse effects

KW - Female

KW - Femur/diagnostic imaging

KW - Hip Prosthesis/adverse effects

KW - Humans

KW - Male

KW - Middle Aged

KW - Osteoarthritis, Hip/surgery

KW - Outcome Assessment, Health Care

KW - Prosthesis Design/adverse effects

KW - Prosthesis Failure/etiology

KW - Radiostereometric Analysis/methods

U2 - 10.1080/17453674.2020.1802682

DO - 10.1080/17453674.2020.1802682

M3 - Journal article

C2 - 32757687

VL - 91

SP - 693

EP - 698

JO - Acta Orthopaedica

JF - Acta Orthopaedica

SN - 1745-3674

IS - 6

ER -

ID: 62392043