Does modularity of metal-on-metal hip implants increase cobalt: chromium ratio?

Background: Blood metal ion levels are used in the surveillance of metal-on-metal (MoM) hip implants. Modular implants contain an extra source of metal debris that may affect the ratio of metal ions in the blood. Methods: This was a retrospective study of 503 patients with hip replacements made by a...

Full description

Saved in:
Bibliographic Details
Published in:Hip international 2021-01, Vol.31 (1), p.109-114
Main Authors: Ilo, Kevin C, Aboelmagd, Karim, Hothi, Harry S, Asaad, Asaad, Skinner, John A, Hart, Alister J
Format: Article
Language:English
Subjects:
Arthroplasty, Replacement, Hip - adverse effects
Chromium
Cobalt - adverse effects
Hip Prosthesis - adverse effects
Humans
Metal-on-Metal Joint Prostheses - adverse effects
Prosthesis Design
Retrospective Studies
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Background: Blood metal ion levels are used in the surveillance of metal-on-metal (MoM) hip implants. Modular implants contain an extra source of metal debris that may affect the ratio of metal ions in the blood. Methods: This was a retrospective study of 503 patients with hip replacements made by a single manufacturer (Smith & Nephew, Warwick, UK) with the same bearing surface. There were 54 total hip arthroplasties, 35 Birmingham Mid-Head Resections and 414 hip resurfacings. Whole blood metal ion levels and their ratios were analysed to investigate the effect of a modular junction. Results: The cobalt:chromium ratios were greater in the total hip arthroplasty group (mean 2.3:1) when compared to the resurfacings group (mean 1.3:1, p = 
ISSN:1120-7000
1724-6067
DOI:10.1177/1120700019873637