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A comparative study on the physicochemical characteristics of nanoparticles released in vivo from CoCrMo tapers and cement–stem interfaces of total hip replacements

DOI: 10.1002/jbm.b.34667 DOI Help

Authors: Alina M. Crainic (University of Southampton) , Mauro Callisti (University of Southampton; Cambridge University) , Arjen Van Veelen (Los Alamos National Lab; Stanford Synchrotron Radiation Lightsource) , Agnes Michalik (University of Southampton) , James A. Milton (University of Southampton) , Martin R. Palmer (University of Southampton) , Richard B. Cook (University of Southampton)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Biomedical Materials Research Part B: Applied Biomaterials , VOL 41

State: Published (Approved)
Published: June 2020
Diamond Proposal Number(s): 17801 , 17203

Abstract: The good biocompatibility and corrosion resistance of the bulk CoCrMo alloy has resulted in it being used in the manufacture of implants and load bearing medical devices. These devices, however, can release wear and corrosion products which differ from the composition of the bulk CoCrMo alloy. The physicochemical characteristics of the particles and the associated in vivo reactivity are dictated by the wear mechanisms and electrochemical conditions at the sites of material loss. Debris released from CoCrMo hip bearings, taper junctions, or cement–stem interfaces can, therefore, have different chemical and morphological characteristics, which provide them with different in vivo toxicities. Here, we propose to assess and compare the characteristics of the particles released in vivo from CoCrMo tapers and cement–stem interfaces which have received less attention compared to debris originating from the hip bearings. The study uses state‐of‐art characterization techniques to provide a detailed understanding of the size, morphology, composition, and chemistry of the particles liberated from the wear and corrosion flakes from revised hip replacements, with an enzymatic treatment. The phase analyses identified Cr2O3 nanoparticles released from tapers and cement–stem interfaces, whose composition did not vary with origin or particle morphology. The size distributions showed significantly smaller particles were released from the stems, compared to the particles originating from the corresponding tapers. The investigation demonstrates that the tribocorrosive processes occurring at the taper and stem interfaces both result in Cr2O3 nanoparticle formation.

Journal Keywords: cobalt chromium; hip replacements; nanoparticles; orthopedics; TEM

Subject Areas: Materials

Instruments: I08-Scanning X-ray Microscopy beamline (SXM)