Larger 5-year migration but similar polyethylene wear of cementless hemispherical cups with electrochemically applied hydroxyapatite (BoneMaster) coating compared with porous plasma-spray titanium: a randomized 5-year RSA study

Authors

  • Sebastian Breddam Mosegaard AutoRSA Research Group, Orthopaedic Research Unit, Aarhus University Hospital, Aarhus; Department of Orthopedic Surgery, Aarhus University Hospital, Aarhus https://orcid.org/0000-0002-8427-9840
  • Peter Bo Jørgensen AutoRSA Research Group, Orthopaedic Research Unit, Aarhus University Hospital, Aarhus; Department of Clinical Medicine, Aarhus University, Aarhus https://orcid.org/0000-0002-5327-8095
  • Stig Storgaard Jakobsen Department of Orthopedic Surgery, Aarhus University Hospital, Aarhus https://orcid.org/0000-0002-1890-3617
  • Henrik Daugaard Department of Orthopedics, Slagelse Hospital, Slagelse, Denmark
  • Kjeld Søballe Department of Orthopedic Surgery, Aarhus University Hospital, Aarhus; Department of Clinical Medicine, Aarhus University, Aarhus
  • Maiken Stilling AutoRSA Research Group, Orthopaedic Research Unit, Aarhus University Hospital, Aarhus; Department of Orthopedic Surgery, Aarhus University Hospital, Aarhus; Department of Clinical Medicine, Aarhus University, Aarhus https://orcid.org/0000-0002-4530-2075

DOI:

https://doi.org/10.2340/17453674.2022.3976

Keywords:

Arthroplasty, Bone, Hip, RCT, RSA

Abstract

Background and purpose: BoneMaster (BM) is a thin electrochemically applied hydroxyapatite (HA) implant coating marketed with expectations of improved osseointegration properties but less polyethylene (PE) wear. We compared the midterm cup migration and PE wear of cementless porous-coated hemispherical cups with and without BM.
Patients and methods: In this patient-blinded, randomized controlled trial, 53 patients with a mean age of 64 years (55–75) received total hip arthroplasty with a porous-coated (P) or porous and BoneMaster (PBM) coated Exceed cup and ArCom E1 infused PE. Patients were followed with RSA, Hip Osteoarthritis Outcome Score (HOOS), and Euro-Qol-5-3L (EQ-5D) at 3 and 6 months, and 1-, 2-, and 5-year
follow-up.
Results: At 5-year follow-up, total translation and maximum total point motion was 0.28 mm (95% CI 0.08; 0.47) and 0.52 mm (CI 0.12; 0.93) higher in the PBM group than in the P group. PE wear was comparable between PBM and P cups, and 2D wear rate from 1-year follow-up to last follow-up was 0.03 mm (CI 0.02–0.03). The 5-year anterior translation was 0.05 mm (CI –0.10 to 0.21) in the normal BMD group and 0.40 mm (CI 0.22–0.57) in the osteopenia group.
Interpretation: At 5-year follow-up, Exceed cups in the PBM group migrated more than in the P group but the PE wear rate was low and similar. This study does not indicate any advantage of additional BoneMaster coating compared with porous coating alone on cementless hemispherical cups with regards to migration, polyethylene wear, and clinical outcomes.

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Published

2022-07-14

How to Cite

Breddam Mosegaard, S., Jørgensen, P. B., Storgaard Jakobsen, S., Daugaard, H., Søballe, K., & Stilling, M. (2022). Larger 5-year migration but similar polyethylene wear of cementless hemispherical cups with electrochemically applied hydroxyapatite (BoneMaster) coating compared with porous plasma-spray titanium: a randomized 5-year RSA study. Acta Orthopaedica, 93, 658–664. https://doi.org/10.2340/17453674.2022.3976

Issue

Section

Randomized clinical trial