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Evaluation of pull‐off strength and seating displacement of sleeved ceramic revision heads in modular hip arthroplasty
Author(s) -
Chaudhary Miriam,
Boruah Sourabh,
Muratoglu Orhun K.,
Varadarajan Kartik M.
Publication year - 2020
Publication title -
journal of orthopaedic research®
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.041
H-Index - 155
eISSN - 1554-527X
pISSN - 0736-0266
DOI - 10.1002/jor.24536
Subject(s) - total hip arthroplasty , displacement (psychology) , modular design , hip arthroplasty , ceramic , arthroplasty , orthodontics , engineering , medicine , materials science , surgery , composite material , computer science , psychology , psychotherapist , operating system
Corrosion in revision total hip arthroplasty can be mitigated using a ceramic head on a well‐fixed in situ stem, but concerns of their early failure because of any surface defects on in situ stem necessitates the use of a titanium sleeve, which furnishes a factory‐finish surface. These sleeves are manufactured in different sizes allowing neck‐length adjustment. The strength of the taper junction of non‐sleeved primary heads is well‐investigated, but the influence of an interposed titanium sleeve on achieving a secure taper lock is unclear. Therefore, this study aimed to investigate the pull‐off strength and seating displacement of revision ceramic heads and titanium taper sleeves. Two different head diameters and two different taper adapter sleeve offset lengths were mated with trunnions at two different impaction forces. The seating displacement and pull‐off force was recorded for each specimen. Profilometry of the grooved outer surfaces of the sleeve and trunnion was done before and after testing to analyze the change in surface roughness. The influence of head diameter, sleeve offset, and impaction force on seating displacement and pull‐off force was analyzed using analysis of covariance. Pull‐off forces for 6 kN assembly force were approximately three times those for 2 kN. The head diameter did not have a significant effect on the measured parameters. Compared with short offset length sleeves, extra‐long increased seating displacement by 31% and reduced pull‐off forces by 15%. While sleeves of different offset lengths permit control of neck length, surgeons must be careful of the impact of this choice on the stability of implant. © 2019 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 38:1523–1528, 2020