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Gazelakis E, Judge RB, Palamara JEA, Subramanian S, Nazir M. Press-Fit Placement of a Rectangular Block Implant in the Resorbed Alveolar Ridge: Surgical and Biomechanical Considerations. Bioengineering (Basel) 2024; 11:532. [PMID: 38927768 PMCID: PMC11200368 DOI: 10.3390/bioengineering11060532] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2024] [Revised: 05/08/2024] [Accepted: 05/16/2024] [Indexed: 06/28/2024] Open
Abstract
Rectangular Block Implant (RBIs) were manufactured, using computer-aided-design lathe turning, surface roughened with grit blasting and gamma irradiated. Implants were surgically placed into the resorbed edentulous mandibular ridges of both greyhound dogs (ex vivo and in vivo) and humans; the pooled total was 17 placements. The aim was to achieve mechanical stability and full implant submergence without damage to the mandibular canal and without bone fracture: fulfilment of all of these criteria was deemed to be a successful surgical outcome. Rectangular osteotomy sites were prepared with piezo surgical instrumentation. Sixteen implants were fully submerged and achieved good primary stability without bone fracture and without evidence of impingement of the mandibular canal. One implant placement was deemed a failure due to bone fracture: the event of a random successful outcome was rejected (p < 0.01 confidence, binomial analysis). Technique of placement yielded excellent mechanical retention: key biomechanical factors that emerged in this process included under preparation of the osteotomy site with the use of specifically designed trial-fit gauges, the viscoelastic property of the peri-implant bone, the flat faces and cornered edges of the block surfaces which enhance stress distribution and mechanical retention, respectively. It was concluded that the surgical protocol for the RBI placement in the resorbed alveolus is a predictable clinical procedure tailored to its specific, unique biomechanical profile.
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Affiliation(s)
- Efthimios Gazelakis
- Melbourne Dental School, University of Melbourne, Parkville, VIC 3052, Australia;
| | - Roy B. Judge
- Department of Prosthodontics, Melbourne Dental School, University of Melbourne, Parkville, VIC 3052, Australia;
| | - Joseph E. A. Palamara
- Restorative Dentistry, Melbourne Dental School, University of Melbourne, Parkville, VIC 3052, Australia;
| | - Shiva Subramanian
- Oral and Maxillofacial Surgery, Melbourne Dental School, University of Melbourne, Parkville, VIC 3052, Australia;
| | - Mohsin Nazir
- Melbourne Dental School, University of Melbourne, Parkville, VIC 3052, Australia;
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Maquer G, Mueri C, Henderson A, Bischoff J, Favre P. Developing and Validating a Model of Humeral Stem Primary Stability, Intended for In Silico Clinical Trials. Ann Biomed Eng 2024; 52:1280-1296. [PMID: 38361138 DOI: 10.1007/s10439-024-03452-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2023] [Accepted: 01/12/2024] [Indexed: 02/17/2024]
Abstract
In silico clinical trials (ISCT) can contribute to demonstrating a device's performance via credible computational models applied on virtual cohorts. Our purpose was to establish the credibility of a model for assessing the risk of humeral stem loosening in total shoulder arthroplasty, based on a twofold validation scheme involving both benchtop and clinical validation activities, for ISCT applications. A finite element model computing bone-implant micromotion (benchtop model) was quantitatively compared to a bone foam micromotion test (benchtop comparator) to ensure that the physics of the system was captured correctly. The model was expanded to a population-based approach (clinical model) and qualitatively evaluated based on its ability to replicate findings from a published clinical study (clinical comparator), namely that grit-blasted stems are at a significantly higher risk of loosening than porous-coated stems, to ensure that clinical performance of the stem can be predicted appropriately. Model form sensitivities pertaining to surgical variation and implant design were evaluated. The model replicated benchtop micromotion measurements (52.1 ± 4.3 µm), without a significant impact of the press-fit ("Press-fit": 54.0 ± 8.5 µm, "No press-fit": 56.0 ± 12.0 µm). Applied to a virtual population, the grit-blasted stems (227 ± 78µm) experienced significantly larger micromotions than porous-coated stems (162 ± 69µm), in accordance with the findings of the clinical comparator. This work provides a concrete example for evaluating the credibility of an ISCT study. By validating the modeling approach against both benchtop and clinical data, model credibility is established for an ISCT application aiming to enrich clinical data in a regulatory submission.
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Affiliation(s)
- Ghislain Maquer
- Zimmer Biomet, Sulzerallee 8, 8404, Winterthur, Switzerland.
| | | | - Adam Henderson
- Zimmer Biomet, Sulzerallee 8, 8404, Winterthur, Switzerland
| | - Jeff Bischoff
- Zimmer Biomet, 1800 West Center St., Warsaw, IN, 46580, USA
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Wearne LS, Rapagna S, Awadalla M, Keene G, Taylor M, Perilli E. Quantifying the immediate post-implantation strain field of cadaveric tibiae implanted with cementless tibial trays: A time-elapsed micro-CT and digital volume correlation analysis during stair descent. J Mech Behav Biomed Mater 2024; 151:106347. [PMID: 38181568 DOI: 10.1016/j.jmbbm.2023.106347] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2023] [Revised: 12/18/2023] [Accepted: 12/22/2023] [Indexed: 01/07/2024]
Abstract
Primary stability, the mechanical fixation between implant and bone prior to osseointegration, is crucial for the long-term success of cementless tibial trays. However, little is known about the mechanical interplay between the implant and bone internally, as experimental studies quantifying internal strain are limited. This study employed digital volume correlation (DVC) to quantify the immediate post-implantation strain field of five cadaveric tibiae implanted with a commercially available cementless titanium tibial tray (Attune, DePuy Synthes). The tibiae were subjected to a five-step loading sequence (0-2.5 bodyweight, BW) replicating stair descent, with concomitant time-elapsed micro-CT imaging. With progressive loads, increased compression of trabecular bone was quantified, with the highest strains directly under the posterior region of the tibial tray implant, dissipating with increasing distance from the bone-implant interface. After load removal of the last load step (2.5BW), residual strains were observed in all of the five tibiae, with residual strains confined within 3.14 mm from the bone-implant interface. The residual strain is reflective of the observed initial migration of cementless tibial trays reported in clinical studies. The presence of strains above the yield strain of bone accepted in literature suggests that inelastic properties should be included within finite element models of the initial mechanical environment. This study provides a means to experimentally quantify the internal strain distribution of human tibia with cementless trays, increasing the understanding of the mechanical interaction between bone and implant.
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Affiliation(s)
- Lauren S Wearne
- Medical Device Research Institute, College of Science and Engineering, Flinders University, Adelaide, South Australia, Australia
| | - Sophie Rapagna
- Medical Device Research Institute, College of Science and Engineering, Flinders University, Adelaide, South Australia, Australia; Flinders Microscopy and Microanalysis, College of Science and Engineering, Flinders University, Adelaide, South Australia, Australia
| | - Maged Awadalla
- Medical Device Research Institute, College of Science and Engineering, Flinders University, Adelaide, South Australia, Australia
| | - Greg Keene
- Orthopaedic Department, SportsMed, Adelaide, South Australia, Australia
| | - Mark Taylor
- Medical Device Research Institute, College of Science and Engineering, Flinders University, Adelaide, South Australia, Australia
| | - Egon Perilli
- Medical Device Research Institute, College of Science and Engineering, Flinders University, Adelaide, South Australia, Australia.
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Fallahnezhad K, Callary SA, O'Rourke D, Bahl JS, Thewlis D, Solomon LB, Taylor M. Corroboration of coupled musculoskeletal model and finite element predictions with in vivo RSA migration of an uncemented acetabular component. J Orthop Res 2024; 42:373-384. [PMID: 37526382 DOI: 10.1002/jor.25671] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/20/2022] [Revised: 06/18/2023] [Accepted: 07/26/2023] [Indexed: 08/02/2023]
Abstract
While finite element (FE) models have been used extensively in orthopedic studies, validation of their outcome metrics has been limited to comparison against ex vivo testing. The aim of this study was to validate FE model predictions of the initial cup mechanical environment against patient-matched in vivo measurements of acetabular cup migration using radiostereometric analysis (RSA). Tailored musculoskeletal and FE models were developed using a combination of three-dimensional (3D) motion capture data and clinical computerized tomography (CT) scans for a cohort of eight individuals who underwent primary total hip replacement and were prospectively enrolled in an RSA study. FE models were developed to calculate the mean modulus of cancellous bone, composite peak micromotion (CPM), composite peak strain (CPS) and percentage area of bone ingrowth. The RSA cup migration at 3 months was used to corroborate the FE output metrics. Qualitatively, all FE-predicted metrics followed a similar rank order as the in vivo RSA 3D migration data. The two cases with the lowest predicted CPM (<20 µm), lowest CPS (<0.0041), and high bone modulus (>917 MPa) were confirmed to have the lowest in vivo RSA 3D migration (<0.14 mm). The two cases with the largest predicted CPM (>80 µm), larger CPS (>0.0119) and lowest bone modulus (<472 MPa) were confirmed to have the largest in vivo RSA 3D migration (>0.78 mm). This study enabled the first corroboration between tailored musculoskeletal and FE model predictions with in vivo RSA cup migration. Investigation of additional patient-matched CT, gait, and RSA examinations may allow further development and validation of FE models.
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Affiliation(s)
- Khosro Fallahnezhad
- Medical Device Research Institute, College of Science and Engineering, Flinders University, Adelaide, South Australia, Australia
| | - Stuart A Callary
- Centre for Orthopaedics and Trauma Research (COTR), The University of Adelaide, Adelaide, South Australia, Australia
- Department of Orthopaedics and Trauma, Royal Adelaide Hospital, Adelaide, South Australia, Australia
| | - Dermot O'Rourke
- School of Mechanical, Medical and Process Engineering, Queensland University of Technology, Brisbane, Queensland, Australia
| | - Jasvir S Bahl
- Centre for Orthopaedics and Trauma Research (COTR), The University of Adelaide, Adelaide, South Australia, Australia
| | - Dominic Thewlis
- Centre for Orthopaedics and Trauma Research (COTR), The University of Adelaide, Adelaide, South Australia, Australia
- Department of Orthopaedics and Trauma, Royal Adelaide Hospital, Adelaide, South Australia, Australia
| | - Lucian B Solomon
- Centre for Orthopaedics and Trauma Research (COTR), The University of Adelaide, Adelaide, South Australia, Australia
- Department of Orthopaedics and Trauma, Royal Adelaide Hospital, Adelaide, South Australia, Australia
| | - Mark Taylor
- Medical Device Research Institute, College of Science and Engineering, Flinders University, Adelaide, South Australia, Australia
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Kohli N, Theodoridis K, Hall TAG, Sanz-Pena I, Gaboriau DCA, van Arkel RJ. Bioreactor analyses of tissue ingrowth, ongrowth and remodelling around implants: An alternative to live animal testing. Front Bioeng Biotechnol 2023; 11:1054391. [PMID: 36890911 PMCID: PMC9986429 DOI: 10.3389/fbioe.2023.1054391] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2022] [Accepted: 02/06/2023] [Indexed: 02/22/2023] Open
Abstract
Introduction: Preclinical assessment of bone remodelling onto, into or around novel implant technologies is underpinned by a large live animal testing burden. The aim of this study was to explore whether a lab-based bioreactor model could provide similar insight. Method: Twelve ex vivo trabecular bone cylinders were extracted from porcine femora and were implanted with additively manufactured stochastic porous titanium implants. Half were cultured dynamically, in a bioreactor with continuous fluid flow and daily cyclic loading, and half in static well plates. Tissue ongrowth, ingrowth and remodelling around the implants were evaluated with imaging and mechanical testing. Results: For both culture conditions, scanning electron microscopy (SEM) revealed bone ongrowth; widefield, backscatter SEM, micro computed tomography scanning, and histology revealed mineralisation inside the implant pores; and histology revealed woven bone formation and bone resorption around the implant. The imaging evidence of this tissue ongrowth, ingrowth and remodelling around the implant was greater for the dynamically cultured samples, and the mechanical testing revealed that the dynamically cultured samples had approximately three times greater push-through fixation strength (p < 0.05). Discussion: Ex vivo bone models enable the analysis of tissue remodelling onto, into and around porous implants in the lab. While static culture conditions exhibited some characteristics of bony adaptation to implantation, simulating physiological conditions with a bioreactor led to an accelerated response.
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Affiliation(s)
- Nupur Kohli
- Biomechanics Group, Department of Mechanical Engineering, Imperial College London, London, United Kingdom
| | - Konstantinos Theodoridis
- Biomechanics Group, Department of Mechanical Engineering, Imperial College London, London, United Kingdom
| | - Thomas A G Hall
- Biomechanics Group, Department of Mechanical Engineering, Imperial College London, London, United Kingdom
| | - Inigo Sanz-Pena
- Biomechanics Group, Department of Mechanical Engineering, Imperial College London, London, United Kingdom
| | - David C A Gaboriau
- FILM, National Heart & Lung Institute, Imperial College London, London, United Kingdom
| | - Richard J van Arkel
- Biomechanics Group, Department of Mechanical Engineering, Imperial College London, London, United Kingdom
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A FE study on the effect of interference fit and coefficient of friction on the micromotions and interface gaps of a cementless PEEK femoral component. J Biomech 2022; 137:111057. [DOI: 10.1016/j.jbiomech.2022.111057] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2021] [Revised: 03/17/2022] [Accepted: 03/21/2022] [Indexed: 11/22/2022]
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Awadalla M, Solomon LB, Heldreth M, Rullkoetter P, Taylor M. Assessment of the primary stability of revision tibial trays augmented with a cementless sleeve in AORI Type III defects. Knee 2021; 33:150-158. [PMID: 34624749 DOI: 10.1016/j.knee.2021.09.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/04/2020] [Revised: 08/31/2021] [Accepted: 09/12/2021] [Indexed: 02/02/2023]
Abstract
BACKGROUND Previous studies have evaluated the initial stability of uncemented tibial components in revision total knee replacement (rTKR) in the presence of an Anderson Orthopaedic Research Institute (AORI) Type II tibial defect. This study sought to evaluate similar metrics in the severe Type III (AORI TIII) defects with combined uncemented stem and sleeve fixation, specifically, the effect of varying the stem's length and tibial canal engagement upon stability and bone strain. METHOD Finite element models generated from the CT scans of 4 tibias with Type III defects were used to investigate the primary stability, in terms of the bone-implant composite peak micromotion (CPM) and microstrains (CPS), achieved after virtual implantations with and without stems. RESULTS A stemless rTKR had increased metaphyseal CPM and CPS compared to all stemmed implants. Significant area of the bone supporting the stemless rTKR had CPS greater than bone yield (7000 με). Short engaging stems (≤150 mm construct length), could not achieve reliable engagement in the diaphysis (canal fill ≤ 50%), leading to insufficient reduction of CPS (≥5000 με). Longer engaging stems (170-220 mm construct length), were able to reliably engage the diaphysis (fill ratio ≥ 75%) resulting in CPS ≤ 5000 με. Although, non-engaging stems resulted in increased CPM and CPS compared to engaging stems, long non-engaging stems (170-220 mm construct) appeared to provide additional stability to the rTKR compared to stemless rTKR. CONCLUSION The results indicate a likely correlation between uncemented stem engagement and metaphyseal CPS in Type III defects. Excessive strain within the supporting metaphyseal bone is likely to lead to rTKR migration and loosening.
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Affiliation(s)
- Maged Awadalla
- Medical Device Research Institute, College of Science and Engineering, Flinders University, SA, Australia.
| | - Lucian B Solomon
- Centre of Orthopaedic and Trauma Research, University of Adelaide, SA, Australia; Centre for Orthopaedic and Trauma Research, Australia
| | - Mark Heldreth
- DePuy Synthes Inc, Joint Reconstruction, Warsaw, IN, USA
| | - Paul Rullkoetter
- Department of Mechanical and Materials Engineering, University of Denver, CO, USA
| | - Mark Taylor
- Medical Device Research Institute, College of Science and Engineering, Flinders University, SA, Australia
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Mathematical Modelling of Destabilization Stress Factors of Stable-Elastic Fixation of Distal Trans- and Suprasyndesmotic Fibular Fractures. JOURNAL OF HEALTHCARE ENGINEERING 2021; 2021:6607364. [PMID: 34795885 PMCID: PMC8594993 DOI: 10.1155/2021/6607364] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/10/2021] [Accepted: 10/21/2021] [Indexed: 11/17/2022]
Abstract
Introduction Specification of possible stress factors destabilizing the fibula stable osteosynthesis by the intramedullary nail with distal blocking and elastic fixation of distal syndesmosis by the thread with endobuttons by mathematical modelling of distal unstable ankle injuries. Material and Methods. We studied the thread tension during the combined stable-elastic fixation of unstable injuries of the ankle joint in cross-syndesmosis fractures of the fibula (B, C Danis–Weber classification), which includes a one-time stable minimally invasive fixation with the intramedullary nail and elastic fixation by the thread with endobuttons. We used a titanium alloy for the intramedullary nail and polyester for the thread. The deformed state was studied using the methods of mechanics. Results A model of a fractured fibula blocked with the intramedullary nail and fixed with the elastic thread was developed. A formulation to specify the rational tension forces of the elastic thread depending on the parameters of the fibula and intramedullary blocking nail and on the location of the bone injury was obtained. The effect of foot rotation on the thread tension was investigated. The results of theoretical research should be implemented in medical practice. Conclusions A mathematical model of the damaged fibula blocked by the intramedullary nail and fixed with the elastic thread was developed. Dependences for calculation of tension of the fixing thread were obtained. A slight increase in thread tension during foot rotation was found.
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Soltanihafshejani N, Bitter T, Janssen D, Verdonschot N. Development of a crushable foam model for human trabecular bone. Med Eng Phys 2021; 96:53-63. [PMID: 34565553 DOI: 10.1016/j.medengphy.2021.08.009] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2021] [Revised: 07/12/2021] [Accepted: 08/31/2021] [Indexed: 11/25/2022]
Abstract
Finite element (FE) simulations can be used to evaluate the mechanical behavior of human bone and allow for quantitative prediction of press-fit implant fixation. An adequate material model that captures post-yield behavior is essential for a realistic simulation. The crushable foam (CF) model is a constitutive model that has recently been proposed in this regard. Compression tests under uniaxial and confined loading conditions were performed on 59 human trabecular bone specimens. Three essential material parameters were obtained as a function of bone mineral density (BMD) to develop the isotropic CF model. The related constitutive rule was implemented in FE models and the results were compared to the experimental data. The CF model provided an accurate simulation of uniaxial compression tests and the post-yield behavior of the stress-strain was well-matched with the experimental results. The model was able to reproduce the confined response of the bone up to 15% of strain. This model allows for simulation of the mechanical behavior of the cellular structure of human bone and adequately predicts the post-yield response of trabecular bone, particularly under uniaxial loading conditions. The model can be further improved to simulate bone collapse due to local overload around orthopaedic implants.
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Affiliation(s)
- Navid Soltanihafshejani
- Radboud University Medical Center, Radboud Institute for Health Sciences, Orthopaedic Research Laboratory, 6500 HB, Nijmegen, the Netherlands.
| | - Thom Bitter
- Radboud University Medical Center, Radboud Institute for Health Sciences, Orthopaedic Research Laboratory, 6500 HB, Nijmegen, the Netherlands
| | - Dennis Janssen
- Radboud University Medical Center, Radboud Institute for Health Sciences, Orthopaedic Research Laboratory, 6500 HB, Nijmegen, the Netherlands
| | - Nico Verdonschot
- Radboud University Medical Center, Radboud Institute for Health Sciences, Orthopaedic Research Laboratory, 6500 HB, Nijmegen, the Netherlands; University of Twente, Laboratory for Biomechanical Engineering, Faculty of Engineering Technology, 7500 AE, Enschede, the Netherlands
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Measurement of Internal Implantation Strains in Analogue Bone Using DVC. MATERIALS 2020; 13:ma13184050. [PMID: 32932608 PMCID: PMC7559792 DOI: 10.3390/ma13184050] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/01/2020] [Revised: 09/04/2020] [Accepted: 09/08/2020] [Indexed: 11/16/2022]
Abstract
The survivorship of cementless orthopaedic implants may be related to their initial stability; insufficient press-fit can lead to excessive micromotion between the implant and bone, joint pain, and surgical revision. However, too much interference between implant and bone can produce excessive strains and damage the bone, which also compromises stability. An understanding of the nature and mechanisms of strain generation during implantation would therefore be valuable. Previous measurements of implantation strain have been limited to local discrete or surface measurements. In this work, we devise a Digital Volume Correlation (DVC) methodology to measure the implantation strain throughout the volume. A simplified implant model was implanted into analogue bone media using a customised loading rig, and a micro-CT protocol optimised to minimise artefacts due to the presence of the implant. The measured strains were interpreted by FE modelling of the displacement-controlled implantation, using a bilinear elastoplastic constitutive model for the analogue bone. The coefficient of friction between the implant and bone was determined using the experimental measurements of the reaction force. Large strains at the interface between the analogue bone and implant produced localised deterioration of the correlation coefficient, compromising the ability to measure strains in this region. Following correlation coefficient thresholding (removing strains with a coefficient less than 0.9), the observed strain patterns were similar between the DVC and FE. However, the magnitude of FE strains was approximately double those measured experimentally. This difference suggests the need for improvements in the interface failure model, for example, to account for localised buckling of the cellular analogue bone structure. A further recommendation from this work is that future DVC experiments involving similar geometries and structures should employ a subvolume size of 0.97 mm as a starting point.
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Time-dependent Viscoelastic Response of Acetabular Bone and Implant Seating during Dynamic Implantation of Press-fit Cups. Med Eng Phys 2020; 81:68-76. [PMID: 32507677 DOI: 10.1016/j.medengphy.2020.05.012] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2019] [Revised: 04/04/2020] [Accepted: 05/13/2020] [Indexed: 11/24/2022]
Abstract
Deformation of an acetabular cup implant during cementless implantation is indicative of the radial compressive forces, and such of the initial implant fixation strength. Stress relaxation in the surrounding bone tissue following implantation could reduce the deformation of the cup and thus primary implant fixation. The aim of this study was therefore to determine the early shape change of the implanted cup immediately after implantation with different press-fit levels and whether recording the force during cup impaction can be used to estimate initial cup fixation. Cup implantations into porcine acetabulae (n=10) were performed using a drop tower. The force induced by the drop weight and cup seating after each impact was recorded. Deformation of the implanted cup was determined with strain gauges over a period of 10min. Lever-out torques were measured to assess the initial fixation strength. Stress relaxation in the bone caused a reduction in cup deformation of 13.52±4.06% after 1min and 29.34±5.11% after 10min. The fixation strength increased with a higher force magnitude during impaction (Rs2=0.810, p=0.037). Reduction of the radial compressive forces due to stress relaxation of the surrounding bone should be considered during press-fit cup implantation in order to compensate for the reduced fixation strength over time. In addition, recording the implantation force could help to estimate initial fixation strength.
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A modified Coulomb’s law for the tangential debonding of osseointegrated implants. Biomech Model Mechanobiol 2020; 19:1091-1108. [DOI: 10.1007/s10237-019-01272-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2019] [Accepted: 11/23/2019] [Indexed: 01/20/2023]
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Gao X, Fraulob M, Haïat G. Biomechanical behaviours of the bone-implant interface: a review. J R Soc Interface 2019; 16:20190259. [PMID: 31362615 PMCID: PMC6685012 DOI: 10.1098/rsif.2019.0259] [Citation(s) in RCA: 97] [Impact Index Per Article: 19.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2019] [Accepted: 07/01/2019] [Indexed: 01/09/2023] Open
Abstract
In recent decades, cementless implants have been widely used in clinical practice to replace missing organs, to replace damaged or missing bone tissue or to restore joint functionality. However, there remain risks of failure which may have dramatic consequences. The success of an implant depends on its stability, which is determined by the biomechanical properties of the bone-implant interface (BII). The aim of this review article is to provide more insight on the current state of the art concerning the evolution of the biomechanical properties of the BII as a function of the implant's environment. The main characteristics of the BII and the determinants of implant stability are first introduced. Then, the different mechanical methods that have been employed to derive the macroscopic properties of the BII will be described. The experimental multi-modality approaches used to determine the microscopic biomechanical properties of periprosthetic newly formed bone tissue are also reviewed. Eventually, the influence of the implant's properties, in terms of both surface properties and biomaterials, is investigated. A better understanding of the phenomena occurring at the BII will lead to (i) medical devices that help surgeons to determine an implant's stability and (ii) an improvement in the quality of implants.
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Affiliation(s)
- Xing Gao
- CNRS, Laboratoire Modélisation et Simulation Multi Echelle, UMR CNRS 8208, 61 avenue du Général de Gaulle, 94010 Créteil cedex, France
- Research Centre for Medical Robotics and Minimally Invasive Surgical Devices, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, People's Republic of China
| | - Manon Fraulob
- CNRS, Laboratoire Modélisation et Simulation Multi Echelle, UMR CNRS 8208, 61 avenue du Général de Gaulle, 94010 Créteil cedex, France
| | - Guillaume Haïat
- CNRS, Laboratoire Modélisation et Simulation Multi Echelle, UMR CNRS 8208, 61 avenue du Général de Gaulle, 94010 Créteil cedex, France
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Campi S, Mellon SJ, Ridley D, Foulke B, Dodd CAF, Pandit HG, Murray DW. Optimal interference of the tibial component of the cementless Oxford Unicompartmental Knee Replacement. Bone Joint Res 2018; 7:226-231. [PMID: 29922440 PMCID: PMC5987689 DOI: 10.1302/2046-3758.73.bjr-2017-0193.r1] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
Objectives The primary stability of the cementless Oxford Unicompartmental Knee Replacement (OUKR) relies on interference fit (or press fit). Insufficient interference may cause implant loosening, whilst excessive interference could cause bone damage and fracture. The aim of this study was to identify the optimal interference fit by measuring the force required to seat the tibial component of the cementless OUKR (push-in force) and the force required to remove the component (pull-out force). Materials and Methods Six cementless OUKR tibial components were implanted in 12 new slots prepared on blocks of solid polyurethane foam (20 pounds per cubic foot (PCF), Sawbones, Malmo, Sweden) with a range of interference of 0.1 mm to 1.9 mm using a Dartec materials testing machine HC10 (Zwick Ltd, Herefordshire, United Kingdom) . The experiment was repeated with cellular polyurethane foam (15 PCF), which is a more porous analogue for trabecular bone. Results The push-in force progressively increased with increasing interference. The pull-out force was related in a non-linear fashion to interference, decreasing with higher interference. Compared with the current nominal interference, a lower interference would reduce the push-in forces by up to 45% (p < 0.001 One way ANOVA) ensuring comparable (or improved) pull-out forces (p > 0.05 Bonferroni post hoc test). With the more porous bone analogue, although the forces were lower, the relationship between interference and push-in and pull-out force were similar. Conclusions This study suggests that decreasing the interference fit of the tibial component of the cementless OUKR reduces the push-in force and can increase the pull-out force. An optimal interference fit may both improve primary fixation and decrease the risk of fracture. Cite this article: S. Campi, S. J. Mellon, D. Ridley, B. Foulke, C. A. F. Dodd, H. G. Pandit, D. W. Murray. Optimal interference of the tibial
component of the cementless Oxford Unicompartmental Knee Replacement. Bone Joint Res 2018;7:226–231. DOI: 10.1302/2046-3758.73.BJR-2017-0193.R1.
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Affiliation(s)
- S Campi
- Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Oxford, UK
| | - S J Mellon
- Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Oxford, UK
| | - D Ridley
- Zimmer Biomet Ltd, Swindon SN3 5HY, UK
| | - B Foulke
- Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Oxford, UK and Indiana University School of Medicine, Indianapolis, USA
| | - C A F Dodd
- Nuffield Orthopaedic Centre, NHS Foundation Trust, Oxford, UK
| | - H G Pandit
- Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Oxford, UK
| | - D W Murray
- Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences and Orthopaedic Surgeon, University of Oxford and Nuffield Orthopaedic Centre, NHS Foundation Trust, Oxford, UK
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15
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van Arkel RJ, Ghouse S, Milner PE, Jeffers JRT. Additive manufactured push-fit implant fixation with screw-strength pull out. J Orthop Res 2018; 36:1508-1518. [PMID: 29023901 PMCID: PMC6175131 DOI: 10.1002/jor.23771] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/05/2017] [Accepted: 10/01/2017] [Indexed: 02/04/2023]
Abstract
Additive manufacturing offers exciting new possibilities for improving long-term metallic implant fixation in bone through enabling open porous structures for bony ingrowth. The aim of this research was to investigate how the technology could also improve initial fixation, a precursor to successful long-term fixation. A new barbed fixation mechanism, relying on flexible struts was proposed and manufactured as a push-fit peg. The technology was optimized using a synthetic bone model and compared with conventional press-fit peg controls tested over a range of interference fits. Optimum designs, achieving maximum pull-out force, were subsequently tested in a cadaveric femoral condyle model. The barbed fixation surface provided more than double the pull-out force for less than a third of the insertion force compared to the best performing conventional press-fit peg (p < 0.001). Indeed, it provided screw-strength pull out from a push-fit device (1,124 ± 146 N). This step change in implant fixation potential offers new capabilities for low profile, minimally invasive implant design, while providing new options to simplify surgery, allowing for one-piece push-fit components with high levels of initial stability. © 2017 The Authors. Journal of Orthopaedic Research® Published by Wiley Periodicals, Inc. on behalf of the Orthopaedic Research Society. J Orthop Res 36:1508-1518, 2018.
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Affiliation(s)
- Richard J. van Arkel
- Department of Mechanical EngineeringImperial College LondonLondonSW7 2AZUnited Kingdom
| | - Shaaz Ghouse
- Department of Mechanical EngineeringImperial College LondonLondonSW7 2AZUnited Kingdom
| | - Piers E. Milner
- Department of Mechanical EngineeringImperial College LondonLondonSW7 2AZUnited Kingdom
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16
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Experimental pre-clinical assessment of the primary stability of two cementless femoral knee components. J Mech Behav Biomed Mater 2017; 75:322-329. [DOI: 10.1016/j.jmbbm.2017.07.043] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2016] [Revised: 05/27/2016] [Accepted: 07/26/2017] [Indexed: 11/16/2022]
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17
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de Ruiter L, Janssen D, Briscoe A, Verdonschot N. Fixation strength of a polyetheretherketone femoral component in total knee arthroplasty. Med Eng Phys 2017; 49:157-162. [DOI: 10.1016/j.medengphy.2017.06.039] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2016] [Revised: 06/22/2017] [Accepted: 06/25/2017] [Indexed: 11/27/2022]
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18
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Experimental and computational analysis of micromotions of an uncemented femoral knee implant using elastic and plastic bone material models. J Biomech 2017; 61:137-143. [DOI: 10.1016/j.jbiomech.2017.07.023] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2016] [Revised: 07/05/2017] [Accepted: 07/16/2017] [Indexed: 11/22/2022]
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19
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Damm NB, Morlock MM, Bishop NE. Influence of trabecular bone quality and implantation direction on press-fit mechanics. J Orthop Res 2017; 35:224-233. [PMID: 27061728 DOI: 10.1002/jor.23257] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/26/2016] [Accepted: 04/04/2016] [Indexed: 02/04/2023]
Abstract
Achieving primary stability of uncemented press-fit prostheses in patients with poor quality bone can involve axial implantation forces large enough to cause bone fracture. Radial implantation eliminates intraoperative impaction forces and could prevent this damage. Platens of two commercial implant surfaces ("Beaded" and "Flaked") were implanted onto trabecular bone specimens of varying quality in a press-fit simulator. Samples were implanted with varying interference, either axially (shear) or radially (normal). Push-in and pull-out forces were measured to assess stability. Microstructural changes in the bone were determined from μCT analysis. For force-defined implantation analysis, push-in and pull-out forces both increased proportionally with increasing radial force, independent of implantation direction, bone quality or implant surface. For position-defined implantation analysis, pull-out forces were generally found to increase with interference and to be greater for radial than axial implantation direction, and to be lower for poor quality bone. Bone density increased locally at the tested interface due to implantation, in particular for the Beaded surface under axial implantation. If a safe radial stress can be determined for cortical bone in a particular patient, the associated implantation force, and pull-out force which represents primary stability, can be directly derived, regardless of implantation direction, bone quality or implant surface. Radial implantation delivers primary stability that is no worse than that for axial implantation and may eliminate potentially damaging impaction forces. Development of implant designs based on this principal might improve implant fixation. © 2016 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 35:224-233, 2017.
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Affiliation(s)
- Niklas B Damm
- Institute of Biomechanics, TUHH Hamburg University of Technology, Denickestrasse 15, D-21073, Hamburg, Germany
| | - Michael M Morlock
- Institute of Biomechanics, TUHH Hamburg University of Technology, Denickestrasse 15, D-21073, Hamburg, Germany
| | - Nicholas E Bishop
- Institute of Biomechanics, TUHH Hamburg University of Technology, Denickestrasse 15, D-21073, Hamburg, Germany.,Department of Life Sciences, Hamburg University of Applied Sciences, Ulmenliet 20, D-21033, Hamburg, Germany
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20
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Mukherjee K, Gupta S. Influence of Implant Surface Texture Design on Peri-Acetabular Bone Ingrowth: A Mechanobiology Based Finite Element Analysis. J Biomech Eng 2017; 139:2592752. [PMID: 27925634 DOI: 10.1115/1.4035369] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2016] [Indexed: 11/08/2022]
Abstract
The fixation of uncemented acetabular components largely depends on the amount of bone ingrowth, which is influenced by the design of the implant surface texture. The objective of this numerical study is to evaluate the effect of these implant texture design factors on bone ingrowth around an acetabular component. The novelty of this study lies in comparative finite element (FE) analysis of 3D microscale models of the implant-bone interface, considering patient-specific mechanical environment, host bone material property and implant-bone relative displacement, in combination with sequential mechanoregulatory algorithm and design of experiment (DOE) based statistical framework. Results indicated that the bone ingrowth process was inhibited due to an increase in interbead spacing from 200 μm to 600 μm and bead diameter from 1000 μm to 1500 μm and a reduction in bead height from 900 μm to 600 μm. Bead height, a main effect, was found to have a predominant influence on bone ingrowth. Among the interaction effects, the combination of bead height and bead diameter was found to have a pronounced influence on bone ingrowth process. A combination of low interbead spacing (P = 200 μm), low bead diameter (D = 1000 μm), and high bead height (H = 900 μm) facilitated peri-acetabular bone ingrowth and an increase in average Young's modulus of newly formed tissue layer. Hence, such a surface texture design seemed to provide improved fixation of the acetabular component.
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Affiliation(s)
- Kaushik Mukherjee
- Department of Mechanical Engineering, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal 721 302, India
| | - Sanjay Gupta
- Professor Department of Mechanical Engineering, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal 721 302, India e-mail:
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21
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Prochor P. Finite element analysis of stresses generated in cortical bone during implantation of a novel Limb Prosthesis Osseointegrated Fixation System. Biocybern Biomed Eng 2017. [DOI: 10.1016/j.bbe.2016.12.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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22
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Li Z, Yang D, Hao W, Wu T, Wu S, Li X. A novel technique for micro-hole forming on skull with the assistance of ultrasonic vibration. J Mech Behav Biomed Mater 2015; 57:1-13. [PMID: 26698192 DOI: 10.1016/j.jmbbm.2015.11.016] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2015] [Revised: 11/12/2015] [Accepted: 11/21/2015] [Indexed: 11/27/2022]
Abstract
Micro-hole opening on skull is technically challenging and is hard to realize by micro-drilling. Low-stiffness of the drill bit is a serious drawback in micro-drilling. To deal with this problem, a novel ultrasonic vibration assisted micro-hole forming technique has been developed. Tip geometry and vibration amplitude are two key factors affecting the performance of this hole forming technique. To investigate their effects, experiment was carried out with 300μm diameter tools of three different tip geometries at three different vibration amplitudes. Hole forming performance was evaluated by the required thrust force, dimensional accuracy, exit burr and micro-structure of bone tissue around the generated hole. Based on the findings from current study, the 60° conically tipped tool helps generate a micro-hole of better quality at a smaller thrust force, and it is more suitable for hole forming than the 120° conically tipped tool and the blunt tipped tool. As for the vibration amplitude, when a larger amplitude is used, a micro-hole of better quality and higher dimensional accuracy can be formed at a smaller thrust force. Findings from this study would lay a technical foundation for accurately generating a high-quality micro-hole on skull, which enables minimally invasive insertion of a microelectrode into brain for neural activity measuring.
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Affiliation(s)
- Zhe Li
- Department of Mechanical Engineering, National University of Singapore, 117576, Singapore
| | - Daoguo Yang
- School of Mechanical and Electrical Engineering, Guilin University of Electronic Technology, Guilin 541004, China.
| | - Weidong Hao
- School of Mechanical and Electrical Engineering, Guilin University of Electronic Technology, Guilin 541004, China
| | - Tiecheng Wu
- Department of Mechanical Engineering, National University of Singapore, 117576, Singapore
| | - Song Wu
- School of Mechanical and Electrical Engineering, Guilin University of Electronic Technology, Guilin 541004, China
| | - Xiaoping Li
- Department of Mechanical Engineering, National University of Singapore, 117576, Singapore.
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