elastography of the bone-implant interface - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Scientific Reports Année : 2019

elastography of the bone-implant interface

Résumé

the stress distribution around endosseous implants is an important determinant of the surgical success. However, no method developed so far to determine the implant stability is sensitive to the loading conditions of the bone-implant interface (Bii). the objective of this study is to investigate whether a quantitative ultrasound (QUS) technique may be used to retrieve information on compressive stresses applied to the BII. An acousto-mechanical device was conceived to compress 18 trabecular bovine bone samples onto coin-shaped implants and to measure the ultrasonic response of the Bii during compression. the biomechanical behavior of the trabecular bone samples was modeled as Neo-Hookean. The reflection coefficient of the BII was shown to decrease as a function of the stress during the elastic compression of the trabecular bone samples and during the collapse of the trabecular network, with an average slope of −4.82 GPa −1. the results may be explained by an increase of the bone-implant contact ratio and by changes of bone structure occurring during compression. the sensitivity of the QUS response of the Bii to compressive stresses opens new paths in the elaboration of patient specific decision support systems allowing surgeons to assess implant stability that should be developed in the future. Endosseous cementless titanium implants are now widely used in orthopedic, dental and maxillofacial surgeries 1,2. However, despite a routine clinical use, osseointegration failures still occur and may have dramatic consequences. The implant surgical success is directly determined by the evolution of the biomechanical properties of the bone-implant interface (BII) 3-5. During surgery, endosseous implants are inserted in a slightly undersized bone cavity formed by drilling or cutting, leading to a pre-stressed state of the bone-implant system referred to as primary implant stability. A compromise should be found between (i) insufficient primary stability leading to excessive interfacial micromotion following surgery 6-8 , which may imply implant migration 9 and failure and (ii) excessive stresses at the BII, which may lead to bone necrosis 10,11. During healing, osseointegration phenomena, corresponding to an apposition of bone tissue around the implant surface, are stimulated by "low level" stresses applied to the BII 12 , but excessive level of stresses may damage the consolidating BII and lead to implant failure. As a consequence, the stress distribution around the implant during and after surgery is an important determinant for the implant success 13 , but it remains difficult to be assessed experimentally. X-ray based techniques 14 and magnetic resonance imaging 15 cannot be used to assess the level of stress at the BII due to diffraction phenomena related to the presence of metal. Therefore, biomechanical methods are needed. An interesting approach to assess the level of stress at the BII consists in employing finite element analysis (FEA). For example, stress and strain fields have been predicted around the BII in the context of dental 16,17 and orthopedic implants applications 18. The results showed that stresses in the range of 0-10 MPa could be obtained at the BII, depending on the physiological boundary conditions. However, despite the progresses realized in computational analyses, it remains difficult to assess in a patient specific manner the loading conditions at the BII due to the complexity of the implant geometry and of the bone material properties. Different biomechanical techniques have been developed to assess implant stability. For example, percussion test methods based on the measurement of the contact duration between the implant and the impacting device have been developed in the context of dental 19 and orthopedic surgery 20,21. The most commonly used biome-chanical technique is the resonance frequency analysis (RFA) 22 , which consists in measuring the first bending
Fichier principal
Vignette du fichier
SciRep_Yoann.pdf (1.87 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte
Loading...

Dates et versions

hal-02387494 , version 1 (29-11-2019)

Identifiants

Citer

Yoann Hériveaux, Vu-Hieu Nguyen, Didier Geiger, Guillaume Haïat. elastography of the bone-implant interface. Scientific Reports, 2019, ⟨10.1038/s41598-019-50665-4⟩. ⟨hal-02387494⟩
15 Consultations
34 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More