Finite element analysis of screw fixation durability under multiple boundary and loading conditions for a custom pelvic implant

Zhu, Yuhui; Babazadeh-Naseri, Ata; Dunbar, Nicholas J.; Brake, Matthew Robert; Zandiyeh, Payam; Li, Geng; Leardini, Alberto; Spazzoli, Benedetta; Fregly, Benjamin J.

doi:10.1016/j.medengphy.2022.103930

Cited by 5 publications

(3 citation statements)

References 41 publications

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“…Additionally, other factors may influence the potential for bone growth, such as bone quality, that were unknown for the present two cases and could, therefore, not be analyzed in the present study 40–42 . Further, the loading conditions between the lumbar and cervical spine differ which may have influenced the fixation observations included in this study 43 . Despite the limited clinical information, the results of the present study are unique and provide a valuable insight into the state of disc replacements at the time of removal.…”

Section: Discussionmentioning

confidence: 95%

“…[40][41][42] Further, the loading conditions between the lumbar and cervical spine differ which may have influenced the fixation observations included in this study. 43 Despite the limited clinical information, the results of the present study are unique and provide a valuable insight into the state of disc replacements at the time of removal. Future studies are necessary to build upon these findings and contribute to our knowledge of TDR fixation.…”

Section: Limitationsmentioning

confidence: 90%

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Observations of bony ongrowth and clinical fixation in two retrieved disc replacements

et al. 2023

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Total disc replacements utilize textured coatings to maximize bony ongrowth. However, the contribution of direct bony attachment to overall fixation for total disc replacements has not been reported. The goal of the present study was to document the extent of bony attachment to the surfaces of two clinically functional total disc replacements that were securely fixed at the time of revision. Two metal‐and‐polymeric disc replacements, one cervical and one lumbar, were evaluated following surgical retrieval. The cervical device was retrieved at 8 months and the lumbar device at 28 months post‐operative. Both devices were reported well‐fixed at the time of removal, with large bone masses attached to one endplate of each device. Visual inspections, non‐destructive gravimetric measurements, and surface metrology were performed to assess fixation. These inspections suggested that both devices had been fixed at the time of removal with little in vivo mechanical damage, as surgical extraction damage was noted on both devices and provided imaging showed a lack of device migration. Devices were then embedded and sectioned to evaluate the bone‐implant interface. High resolution photographs and contact microradiographs were taken to assess bony attachment. In contrast to initial analysis, these images revealed radiolucent gaps between the endplates and bone masses. Little direct contact between the bone and endplate surface was identified and the original surgical cuts were still visible. Both devices were clinically fixed at the time of removal and neither had complications associated with loosening. However, osseointegration was minimal in one of the devices and altogether absent from the other. The findings of the present study suggest that other factors may influence overall clinical fixation such as the surgical preparation of the vertebral bone or the surface roughness of the treated endplates. Despite the limitations of the present study, this information is unique to the current total disc replacement literature and the ongrowth and fixation of devices should be considered as a topic for future investigation.

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Section: Discussionmentioning

confidence: 95%

Section: Limitationsmentioning

confidence: 90%

Observations of bony ongrowth and clinical fixation in two retrieved disc replacements

et al. 2023

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“…In the manufacturing sector, dowel screws, concrete screws, mirror screws, and drywall screws are among the most frequent. According to Zhu et al [5], a screw's durability is determined by the width and spacing of its threads. Yet, the more threads there are, the more times the screw would have to be turned in order to secure it.…”

Section: Bolts Screws and Studsmentioning

confidence: 99%

Designing Material Structures and Standards Considering Customer Requirements

Xue

Liu

2023

JCIMS

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Material standardization (the replacement of numerous components/ materials with a single component that provides all of the capabilities of the materials/components it replaces) is an essential purchasing department decision. For historical reasons, developing a standard has always included reaching a consensus among national and international groups. Voting determines whether or not the proposed standards will be accepted, and this is not geared for the consumer. Hence, including design principles into the process of creating material standards is beneficial. While looking at various material standards, it is not immediately clear how the customers' requirements have been met. This article will seek out the requirements of the consumer in terms of material standards and then look at the ways those needs have been addressed in four distinct norms. It would not zero in on any one material, but rather try to identify needs shared by designers across disciplines and media. As a result, there is no one standard that meets all of the criteria, and all of the standards only meet some of them.

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Evaluation of finite element modeling methods for predicting compression screw failure in a custom pelvic implant

Zhu,

Babazadeh-Naseri,

Brake

et al. 2024

Front. Bioeng. Biotechnol.

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Introduction: Three-dimensional (3D)-printed custom pelvic implants have become a clinically viable option for patients undergoing pelvic cancer surgery with resection of the hip joint. However, increased clinical utilization has also necessitated improved implant durability, especially with regard to the compression screws used to secure the implant to remaining pelvic bone. This study evaluated six different finite element (FE) screw modeling methods for predicting compression screw pullout and fatigue failure in a custom pelvic implant secured to bone using nine compression screws.Methods: Three modeling methods (tied constraints (TIE), bolt load with constant force (BL-CF), and bolt load with constant length (BL-CL)) generated screw axial forces using functionality built into Abaqus FE software; while the remaining three modeling methods (isotropic pseudo-thermal field (ISO), orthotropic pseudo-thermal field (ORT), and equal-and-opposite force field (FOR)) generated screw axial forces using iterative physics-based relationships that can be implemented in any FE software. The ability of all six modeling methods to match specified screw pretension forces and predict screw pullout and fatigue failure was evaluated using an FE model of a custom pelvic implant with total hip replacement. The applied hip contact forces in the FE model were estimated at two locations in a gait cycle. For each of the nine screws in the custom implant FE model, likelihood of screw pullout failure was predicted using maximum screw axial force, while likelihood of screw fatigue failure was predicted using maximum von Mises stress.Results: The three iterative physics-based modeling methods and the non-iterative Abaqus BL-CL method produced nearly identical predictions for likelihood of screw pullout and fatigue failure, while the other two built-in Abaqus modeling methods yielded vastly different predictions. However, the Abaqus BL-CL method required the least computation time, largely because an iterative process was not needed to induce specified screw pretension forces. Of the three iterative methods, FOR required the fewest iterations and thus the least computation time.Discussion: These findings suggest that the BL-CL screw modeling method is the best option when Abaqus is used for predicting screw pullout and fatigue failure in custom pelvis prostheses, while the iterative physics-based FOR method is the best option if FE software other than Abaqus is used.

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Finite element analysis of screw fixation durability under multiple boundary and loading conditions for a custom pelvic implant

Cited by 5 publications

References 41 publications

Observations of bony ongrowth and clinical fixation in two retrieved disc replacements

Observations of bony ongrowth and clinical fixation in two retrieved disc replacements

Designing Material Structures and Standards Considering Customer Requirements

Evaluation of finite element modeling methods for predicting compression screw failure in a custom pelvic implant

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