The Influence of Geometry of Implants for Direct Skeletal Attachment of Limb Prosthesis on Rehabilitation Program and Stress-Shielding Intensity

Piotr Prochor , Eugeniusz Sajewicz

Abstract

The purpose of the research was to evaluate the influence of selected parameters of the implants for bone anchored prostheses on possibility of conducting static load bearing exercises and stress-shielding intensity. A press-fit implant, a threaded implant, and the proposed design were compared using the finite element method. For the analyses two features were examined: diameter (19.0 – 21.0 mm) and length (75.0 – 130.0 mm). To define the possibility of conducting rehabilitation exercises the micromotion of implants while axial loading with a force up to 1000 N was examined to evaluate the changes at implant-bone interface. The stress-shielding intensity was estimated by bone mass loss over 60 months. The results suggest that, in terms of micromotion generated during rehabilitation exercises, the threaded (max. micromotion of 16.00μm) and the proposed (max. micromotion of 45.43μm) implants ensure low and appropriate micromotion. In the case of the press-fit solution the load values should be selected with care, as there is a risk of losing primary stabilisation. The allowed forces (that do not stimulate the organism to generate fibrous tissue) were approx. 140 N in the case of the length of 75 mm, increasing up to 560 N, while using the length of 130 mm. Moreover, obtained stress-shielding intensities suggest that the proposed implant should provide appropriate secondary stability, similar to the threaded solution, due to the low bone mass loss during long-term use (improving at the same time more bone remodelling in distal Gruen zones, by providing lower bone mass loss by approx. 13% to 20% in dependency of the length and diameter used). On this basis it can be concluded that the proposed design can be an appropriate alternative to commercially used implants.
Author Piotr Prochor (FME / DBBE)
Piotr Prochor,,
- Department of Biocybernetics and Biomedical Engineering
, Eugeniusz Sajewicz (FME / DBBE)
Eugeniusz Sajewicz,,
- Department of Biocybernetics and Biomedical Engineering
Journal seriesBioMed Research International, [Journal of Biomedicine and Biotechnology], ISSN 1110-7243, [1110-7251, 2314-6133, 2314-6141], (N/A 70 pkt, Not active)
Issue year2019
Vol2019
Pages1-17
Publication size in sheets0.8
ASJC Classification2700 General Medicine; 1300 General Biochemistry, Genetics and Molecular Biology; 1305 Biotechnology; 1311 Genetics; 1312 Molecular Biology; 1313 Molecular Medicine; 2400 General Immunology and Microbiology; 2307 Health, Toxicology and Mutagenesis
DOIDOI:10.1155/2019/6067952
Languageen angielski
Score (nominal)70
Score sourcejournalList
ScoreMinisterial score = 70.0, 26-02-2020, ArticleFromJournal
Publication indicators Scopus SNIP (Source Normalised Impact per Paper): 2016 = 0.875; WoS Impact Factor: 2018 = 2.197 (2) - 2018=2.885 (5)
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