A. Grujicic, M. LaBerge, X. Xie, G. Arakere, B. Pandurangan, M. Grujicic, K.J. Jeray and S.L. Tanner
The purpose of this paper is to compare fracture‐fixation and bone‐healing promotion efficacies of an intramedullary (IM) nail‐type and an external osteosynthesis plate‐type…
Abstract
Purpose
The purpose of this paper is to compare fracture‐fixation and bone‐healing promotion efficacies of an intramedullary (IM) nail‐type and an external osteosynthesis plate‐type femoral trochanteric‐fracture implants using the results of a combined multi‐body dynamics and finite element analyses. For both implants, fracture fixation was obtained using a dynamic hip blade which is anchored to the femur head on one end and is connected to the IM rod/plate on the other. The analysis was carried out for two pre‐fracture conditions of the femur: healthy and osteoporotic.
Design/methodology/approach
The musculoskeletal dynamics portion of the analysis was used to obtain realistic physiological loading conditions (i.e. muscle forces and joint reaction forces and moments) associated with four typical everyday activities of a patient, namely, walking, lunging, cycling and egress (i.e. exiting a passenger vehicle). The subsequent structural finite element analysis of the fractured femur/implant assembly was employed to quantify fracture‐fixation efficacy (as measured by the extents of lateral (found to be minor), flexural and torsional displacements of the two femur fragments) and the bone‐healing promotion efficacy (as quantified by the fraction of the fractured surface area which experienced desirable contact pressures).
Findings
The results obtained show that, in general, the IM‐rod type of implant out‐performs the osteosynthesis plate type of implant over a large range of scenarios involving relative importance of the bone‐healing promotion and fracture‐fixation efficacies, health condition of the femur and the activity level of the patient. More specifically, the more active the patient and the larger extent of osteoporosis in the femur, the more justifiable is the use of the IM‐rod type of implant.
Originality/value
The present approach enables assessment of the fracture‐fixation performance of orthopedic implants under physiologically realistic loading conditions.
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Sahil Dhiman, Sarabjeet Singh Sidhu, Preetkanwal Singh Bains and Marjan Bahraminasab
With technology advances, metallic implants claim to improve the quality and durability of human life. In the recent decade, Ti-6Al-4V biomaterial has been additively manufactured…
Abstract
Purpose
With technology advances, metallic implants claim to improve the quality and durability of human life. In the recent decade, Ti-6Al-4V biomaterial has been additively manufactured via selective laser melting (SLM) for orthopedic applications. This paper aims to provide state-of-the-art on mechanobiology of these fabricated components.
Design/methodology/approach
A literature review has been done to explore the potential of SLM fabricated Ti-6Al-4V porous lattice structures (LS) as bone substitutes. The emphasize was on the effect of process parameters and porosity on mechanical and biological properties. The papers published since 2007 were considered here. The keywords used to search were porous Ti-6Al-4V, additive manufacturing, metal three-dimensional printing, osseointegration, porous LS, SLM, in vitro and in vivo.
Findings
The properties of SLM porous biomaterials were compared with different human bones, and bulk SLM fabricated Ti-6Al-4V structures. The comparison was also made between LS with different unit cells to find out whether there is any particular design that can mimic the human bone functionality and enhance osseointegration.
Originality/value
The implant porosity plays a crucial role in mechanical and biological characteristics that relies on the optimum controlled process variables and design attributes. It was also indicated that although the mechanical strength (compressive and fatigue) of porous LS is not mostly close to natural cortical bone, elastic modulus can be adjusted to match that of cortical or cancellous bone. Porous Ti-6Al-4V provide favorable bone formation. However, the effect of design variables on biological behavior cannot be fully conclusive as few studies have been dedicated to this.
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One of the most serious problems facing the country today is maintaining dietary standards, especially in the vulnerable groups, in the face of rising food prices. If it were food…
Abstract
One of the most serious problems facing the country today is maintaining dietary standards, especially in the vulnerable groups, in the face of rising food prices. If it were food prices alone, household budgetry could cope, but much as rising food prices take from the housewife's purse, rates, fuel, travel and the like seem to take more; for food, it is normally pence, but for the others, it is pounds! The Price Commission is often accused of being a watch‐dog which barks but rarely if ever bites and when it attempts to do this, like as not, Union power prevents any help to the housewife. There would be far less grumbling and complaining by consumers if they could see value for their money; they only see themselves constantly overcharged and, in fact, cheated all along the line. In past issues, BFJ has commented on the price vagaries in the greengrocery trade, especially the prices of fresh fruit and vegetables. Living in a part of the country given over to fruit farming and field vegetable crops, it is impossible to remain unaware of what goes on in this sector of the food trade. Unprecedented prosperity among the growers; and where fruit‐farming is combined with field crops, potatoes, cabbage, cauliflower and leafy brassicas, many of the more simple growers find the sums involved frightening. The wholesalers and middle‐men are something of unknown entities, but the prices in the shops are there for all to see. The findings of an investigation by the Commission into the trade, the profit margins between wholesale prices and greengrocers' selling prices, published in February last, were therefore not altogether surprising. The survey into prices and profits covered five basic vegetables and was ordered by the present Prices Secretary the previous November. Prices for September to November were monitored for the vegetables—cabbages, brussels sprouts, cauliflowers, carrots, turnips and swedes, the last priced together. Potatoes were already being monitored.
Minh Nguyen, Mohammed Melaisi, Brent Cowan, Alvaro Joffre Uribe Quevedo and Bill Kapralos
The purpose of this paper is to examine the application of low-end, low-fidelity (gaming/consumer-level) haptic devices for medical-based, surgical skills development (surgical…
Abstract
Purpose
The purpose of this paper is to examine the application of low-end, low-fidelity (gaming/consumer-level) haptic devices for medical-based, surgical skills development (surgical bone-based drilling in particular) with serious games and virtual simulations as an affordable training solution with the potential of complementing current and traditional training methods.
Design/methodology/approach
The authors present the adaptation of two low-end haptic devices (Novint Falcon and Geomagic 3D Touch) to simulate a surgical drill drilling through bone for a serious game developed for total knee arthroplasty training. The implementation was possible through the analysis of the bone drilling mechanics. The authors provide a quantitative comparison of both haptic devices with respect to forces, movements, and development.
Findings
Although further testing is required, the initial results demonstrate that the low-end, consumer-level haptic devices can be incorporated into virtual environments/serious games to allow for the simulation of surgical drilling. The authors also believe that the results will generalize and allow these devices to be used to simulate a variety of technical-based medical procedures.
Originality/value
In contrast to previous work where the focus is placed on cost-prohibitive haptic devices, this approach considers affordable consumer-level solutions that can be easily incorporated into a variety of serious games and virtual simulations. This holds promise that haptic-based virtual simulation and serious games become more widespread, ultimately ensuring that medical trainees are better prepared before exposure to live patients.
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The Universal Decimal Classification (UDC) is able to provide a detailed description of the subject content of a document in any area. Its hierarchical and synthetic structure…
Abstract
The Universal Decimal Classification (UDC) is able to provide a detailed description of the subject content of a document in any area. Its hierarchical and synthetic structure, which is generally reflected in its notation, should enable computer searching for hierarchically‐related subjects and for the individual facets of a complex subject. The possibilities of using these features in automated retrieval are discussed, and attention is drawn to places where the UDC falls short. A number of online catalogues, databases, and information retrieval packages are discussed in terms of their ability to allow searching on UDC numbers. The most sophisticated ones, such as ETHICS at the ETH Library, use a separate file of verbal descriptors linked to the document file through UDC numbers. Suggestions are made for enhancing retrieval performance on UDC numbers in simple systems, and for ways in which the classification might be developed to improve automated searching.
Yasanur Kayikci, Melisa Ozbiltekin and Yigit Kazancoglu
The purpose of this paper is to find solutions to improve the red meat sector in an emerging economy, Turkey, from the circular economy point of view, and taking sustainability…
Abstract
Purpose
The purpose of this paper is to find solutions to improve the red meat sector in an emerging economy, Turkey, from the circular economy point of view, and taking sustainability approach. The need for circular management within the red meat sector in Turkey is emphasized by using Grey method. As theoretical contribution of this study, the investigation of the causes of losses at the slaughter stages of the red meat supply chain leads to proposals for sustainable and circular solutions.
Design/methodology/approach
Grey method is used to predict the number of slaughtered cattle and the amount of bone and blood waste in the slaughtering process between 2018 and 2020.
Findings
It is revealed that according to Grey prediction calculations, although the amount of slaughtered cattle, bone and blood waste seem have decreased between 2018 and 2020, there are still significant losses in Turkish red meat sector. For bone waste, this is expected to be 56,581,200 kg in 2018, 48,235,840 kg in 2019 and 41,121,380 kg in 2020. For blood waste, it is expected to be 24,754,275 kg in 2018, 21,103,180 kg in 2019 and 17,990,604 kg in 2020.
Social implications
The proposed model in the study will contribute on sector revitalization, increase in product safety, quality and hygiene, development in the management of training and education centers for farmers/labors and increase in employment.
Originality/value
This paper represents policymakers with a proposal for triple bottom line (TBL) based circular and central slaughterhouse model, based on TBL, which brings social, economic and environmental benefits for the red meat sector in Turkey.
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Kristy Henson, Paul Constantino, F. Robin O’Keefe and Greg Popovich
The topic of human skeletal analysis is a sensitive subject in North America. Laws and regulations surrounding research of human skeletal material make it difficult to use these…
Abstract
Purpose
The topic of human skeletal analysis is a sensitive subject in North America. Laws and regulations surrounding research of human skeletal material make it difficult to use these remains to characterize various populations. Recent technology has the potential to solve this dilemma. Three-dimensional (3D) scanning creates virtual models of this material, and stores the information, allowing future studies on the material. The paper aims to discuss these issues.
Design/methodology/approach
To assess the potential of this methodology, the authors compared processing time, accuracy and costs of computer tomography (CT) scanner to the Artec Eva portable 3D surface scanner. Using both methodologies the authors scanned and 3D printed one adult individual. The authors hypothesize that the Artec Eva will create digital replicas of <5 percent error based on Buikstra and Ubelaker standard osteometric measurements. Error was tested by comparing the measurements of the skeletal material to the Artec data, CT data and 3D printed data.
Findings
Results show that larger bones recorded by the Artec Eva have <5 percent error of the original specimen while smaller more detailed images have >5 percent error. The CT images are closer to <5 percent accuracy, with few bones still >5 percent error. The Artec Eva scanner is inexpensive in comparison to a CT machine, but takes twice as long to process the Eva’s data. The Artec Eva is sufficient in replication of larger elements, but the CT machine is still a preferable means of skeletal replication, particularly for small elements.
Originality/value
This research paper is unique because it compares two common forms of digitization, which has not been done. The authors believe this paper would be of value to natural history curators and various researchers.
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Diana Popescu, Dan Laptoiu, Rodica Marinescu and Iozefina Botezatu
This paper aims to fill a research gap by presenting design and 3D printing guidelines and considerations which apply to the development process of patient-specific osteotomy…
Abstract
Purpose
This paper aims to fill a research gap by presenting design and 3D printing guidelines and considerations which apply to the development process of patient-specific osteotomy guides for orthopaedic surgery.
Design/methodology/approach
Analysis of specific constraints related to patient-specific surgical guides design and 3D printing, lessons learned during the development process of osteotomy guides for orthopaedic surgery, literature review of recent studies in the field and data gathered from questioning a group of surgeons for capturing their preferences in terms of surgical guides design corresponding to precise functionality (materializing cutting trajectories, ensuring unique positioning and stable fixation during surgery), were all used to extract design recommendations.
Findings
General design rules for patient-specific osteotomy guides were inferred from examining each step of the design process applied in several case studies in relation to how these guides should be designed to fulfill medical and manufacturing (fused deposition modelling process) constraints. Literature was also investigated for finding other information than the simple reference that the surgical guide is modelled as negative of the bone. It was noticed that literature is focussed more on presenting and discussing medical issues and on assessing surgical outcomes, but hardly at all on guides’ design and design for additive manufacturing aspects. Moreover, surgeons’ opinion was investigated to collect data on different design aspects, as well as interest and willingness to use such 3D-printed surgical guides in training and surgery.
Practical implications
The study contains useful rules and recommendations for engineers involved in designing and 3D printing patient-specific osteotomy guides.
Originality/value
A synergetic approach to identify general rules and recommendations for the patient-specific surgical guides design is presented. Specific constraints are identified and analysed using three case studies of wrist, femur and foot osteotomies. Recent literature is reviewed and surgeons’ opinion is investigated.
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Dario Puppi, Alessandro Pirosa, Andrea Morelli and Federica Chiellini
The purpose of this paper is to describe the fabrication and characterization of poly[(R)-3-hydroxybutyrate-co-(R)-3-hydroxyexanoate] (PHBHHx) tissue engineering scaffolds with…
Abstract
Purpose
The purpose of this paper is to describe the fabrication and characterization of poly[(R)-3-hydroxybutyrate-co-(R)-3-hydroxyexanoate] (PHBHHx) tissue engineering scaffolds with anatomical shape and customized porous structure.
Design/methodology/approach
Scaffolds with external shape and size modeled on a critical size segment of a rabbit’s radius model and an internal macrochanneled porous structure were designed and fabricated by means of a computer-aided wet-spinning (CAWS) technique. Morphological, thermal and mechanical characterization were carried out to assess the effect of the fabrication process on material properties and the potential of the PHBHHx scaffolds in comparison with anatomical star poly(e-caprolactone) (*PCL) scaffolds previously validated in vivo.
Findings
The CAWS technique is well suited for the layered manufacturing of anatomical PHBHHx scaffolds with a tailored porous architecture characterized by a longitudinal macrochannel. Morphological analysis showed that the scaffolds were composed by overlapping layers of microfibers with a spongy morphology, forming a 3D interconnected network of pores. Physical-chemical characterization indicated that the used technique did not affect the molecular structure of the processed polymer. Analysis of the compressive and tensile mechanical properties of the scaffolds highlighted the anisotropic behavior of the porous structure and the effect of the macrochannel in enhancing scaffold compressive stiffness. In comparison to the *PCL scaffolds, PHBHHx scaffolds showed higher compressive stiffness and tensile deformability.
Originality/value
This study shows the possibility of using renewable microbial polyester for the fabrication of scaffolds with anatomical shape and internal architecture tailored for in vivo bone regeneration studies.
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Jens Hogreve and Andrea Beierlein
The authors explore the outcomes of health-care professionals' participation in a vendor-hosted online community by combining qualitative and quantitative data collected in two…
Abstract
Purpose
The authors explore the outcomes of health-care professionals' participation in a vendor-hosted online community by combining qualitative and quantitative data collected in two separate studies. The authors aim to shed light on the potential value outcomes of community participation covering the reduction of service costs by professionals' community participation.
Design/methodology/approach
The authors explore the outcomes of health-care professionals' participation in a vendor-hosted online community by combining qualitative and quantitative data collected in two separate studies. The authors also introduce GABEK® as a unique method of qualitative empirical content analysis. In the quantitative study, the authors refer to customer survey data and transactional data.
Findings
The results show that participation in online communities by professionals emerges as a dual concept, consisting of both help-seeking and help-providing behaviors. These behaviors in turn facilitate the creation of economic and relational value, as well as influencing the perceived usefulness of the online community, resulting in higher satisfaction with the community among the participating professionals. Customer survey data and transactional data were gathered from a major medical equipment vendor hosting an online community, and those data confirm that participation also decreases service support costs to professionals by reducing the number of necessary service visits by the vendor's service technicians.
Practical implications
The resulting model of participation and corresponding benefits in an online community for health-care professionals reflects and informs current developments in the health care industry.
Originality/value
The combination of qualitative as well as quantitative studies relying on the data of a world leading medical equipment vendor hosting an online community provides unique and innovative insights into participation and value creation within B2B communities.