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Papers by Ernest Kostenko

Research paper thumbnail of Machine Learning in Assessing Canine Bone Fracture Risk: A Retrospective and Predictive Approach

Applied sciences, Jun 4, 2024

This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY

Research paper thumbnail of Canis lupus familiaris kaulinio audinio mechaninių savybių ir lūžio rizikos modeliavimas osteoporozės kontekste

Vadovas prof. dr. Algirdas MAKNICKAS (Vilniaus Gedimino technikos universitetas, Mechanikos inžin... more Vadovas prof. dr. Algirdas MAKNICKAS (Vilniaus Gedimino technikos universitetas, Mechanikos inžinerija-T 009). Vilniaus Gedimino technikos universiteto Mechanikos inžinerijos mokslo krypties disertacijos gynimo taryba: Pirmininkas prof. dr. Dalius MAŽEIKA (Vilniaus Gedimino technikos universitetas, Mechanikos inžinerija-T 009). Nariai: prof. dr. Raimondas JASEVIČIUS (Vilniaus Gedimino technikos universitetas, Mechanikos inžinerija-T 009), doc. dr. Nomeda JUODŽIUKYNIENĖ (Lietuvos sveikatos mokslų universitetas, Veterinarija-A 002), prof. dr. Arnas KAČENIAUSKAS (Vilniaus Gedimino technikos universitetas, Mechanikos inžinerija-T 009), prof. dr. Jerzy ROJEK (Lenkijos mokslų akademijos fundamentinių technologinių tyrimų institutas, Mechanikos inžinerija-T 009). Disertacija bus ginama viešame Mechanikos inžinerijos mokslo krypties disertacijos gynimo tarybos posėdyje 2024 m. liepos 5 d. 9 val. Vilniaus Gedimino technikos universiteto SRA-I posėdžių salėje.

Research paper thumbnail of Quantitative Analysis of Stress–Stretch Curves in Canine Lumbar Vertebrae Using Modified Logistic Functions

Bioengineering, May 20, 2024

This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY

Research paper thumbnail of Experimental and theoretical investigation of aortic wall tissue in tensile tests

Technology and Health Care, Nov 15, 2023

BACKGROUND: Understanding the mechanical properties of aortic tissue is essential for developing ... more BACKGROUND: Understanding the mechanical properties of aortic tissue is essential for developing numerical computation tools and assessing the risk of aortic aneurysm fractures. Tensile tests using aortic wall specimens allow for the determination of stress and strain depending on the location and direction of the sample. OBJECTIVE: The aim of this study was to perform a mechanical tensile test using canine aorta samples and create a numerical model of aortic tissue tension from the processed data. METHODS: Dogbone-shaped samples were dissected from canine aortic segments. The initial measurements were made at zero tension and the tensile tests were conducted at 10 mm/min until rupture. Force and stretch data were used to obtain engineering and true stress-strain curves. The true stress-strain curves were taken until the maximum strength was obtained, after which they were smoothed and fitted using a logistic function with three coefficients. These curves were then used as material mechanical properties for a numerical model of the aortic tissue tension. A simplified rectangle form was used to mimic the middle of the dogbone-shaped portion of the tissue specimen. Experimental displacement data were collected for the boundary conditions of the finite element 3D model. RESULTS: The experimental data processing revealed that the logistic function described the nonlinear behaviour of the aorta soft tissue with an accuracy of 95% from the start of the tension to the media layer rupture. By applying numerical simulations, we obtained a correspondence of the load curve with an RMSE = 0.069 for the theoretical and experimental external tension data. CONCLUSION: The numerical investigation confirmed that the non-linear soft tissue was validated by applying a logistic function approach to the mechanical properties of the aortic wall.

Research paper thumbnail of Finite Element Model of Canine-Specific Vertebrae Incorporating Biomechanical Tissue Nonlinearity

Applied sciences, Feb 29, 2024

This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY

Research paper thumbnail of Histomorphometry and μCT scan analysis of osteoporosis in spayed female dogs

Open Veterinary Journal

Background: Both humans and small animals suffer from similar metabolic and structural diseases t... more Background: Both humans and small animals suffer from similar metabolic and structural diseases that impact the musculoskeletal system; however, instead of studying animal disease in its own right, animals are more often used as models for research into various human ailments, such as osteoporosis. There are few studies indicating that animals may suffer from osteoporosis, which raises the question of why small animals, which we believe to be equally susceptible, receive so little attention. With this research, we hope to draw the attention of researchers to the fact that the examination of animals for this disease is just as important as the examination of humans; human osteoporosis research receives a great deal of attention, while animals and their health are neglected. Aims: We aimed to analyse the bone volume fraction (BV/TV) and thickness of first (L1) and second (L2) lumbar vertebrae samples from five cadavers using histomorphometric analysis. In addition, we aimed to investi...

Research paper thumbnail of Ilizarov's apparatus method analysis in the small animal surgery

The Master‘s thesis consisted of: 49 pages, in which there are 22 pictures, 2 tables, there were ... more The Master‘s thesis consisted of: 49 pages, in which there are 22 pictures, 2 tables, there were used 58 literature sources and included 1 appendix. A retrospective case-study study was carried out in the X small animal clinic which applies the G. A. Ilizarov‘s external skeletal fixation‘s technique when there was diagnosed a bone fracture in the limb. For the case analysis there was created a survey, later computer database was created for saving and analysing clinical cases purposes. While collecting the information during the research for the traumatised animals there were a lot of examinations performed: general clinical, orthopedic, X-ray examinations, morphological and biochemical blood tests. There were collected information about: animal‘s breed, sex, age. Rentgenograms were analised for these aspects: a body side, a fractured limb bone, a fractured zone and a fractured type. There were also evaluated the influence for these factors and healing duration. To analise external ...

Research paper thumbnail of Ilizarovo aparato taikymo analizė smulkiųjų gyvūnų chirurgijoje

Research paper thumbnail of Monopolar electrocautery use in minimally invasive urosurgery: case report of ectopic ureter management in a bitch

Open Veterinary Journal, 2022

Research paper thumbnail of Empirical case report of the mechanical properties of three spayed canine lumbar vertebrae

Open Veterinary Journal

Background: Today, animals, like humans, suffer from spinal illnesses, which are aggravated in ol... more Background: Today, animals, like humans, suffer from spinal illnesses, which are aggravated in old age. Much emphasis is placed on diagnosis and treatment, but little focus is given to the spine's mechanical properties. Degenerative spine diseases are a major problem throughout the world. According to the World Health Organization, osteoporosis is a world-class public problem that reduces bone mass, resulting in bone fracturing and increased risk of bone fracturing. Therefore, the mechanical investigation of vertebrae can provide more information about the development of osteoporosis. Case Description: For our case report, we used spayed mongrel lumbar vertebrae samples obtained from a canine which was about 8 years old and weighed 28 kg. The dog was diagnosed with a mammary tumour, and the dog’s owners decided to euthanise the dog. All consent forms were filled. Conclusions: Mechanical tests were performed on three vertebrae, and a noticeable difference was observed in the firs...

Research paper thumbnail of Machine Learning in Assessing Canine Bone Fracture Risk: A Retrospective and Predictive Approach

Applied sciences, Jun 4, 2024

This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY

Research paper thumbnail of Canis lupus familiaris kaulinio audinio mechaninių savybių ir lūžio rizikos modeliavimas osteoporozės kontekste

Vadovas prof. dr. Algirdas MAKNICKAS (Vilniaus Gedimino technikos universitetas, Mechanikos inžin... more Vadovas prof. dr. Algirdas MAKNICKAS (Vilniaus Gedimino technikos universitetas, Mechanikos inžinerija-T 009). Vilniaus Gedimino technikos universiteto Mechanikos inžinerijos mokslo krypties disertacijos gynimo taryba: Pirmininkas prof. dr. Dalius MAŽEIKA (Vilniaus Gedimino technikos universitetas, Mechanikos inžinerija-T 009). Nariai: prof. dr. Raimondas JASEVIČIUS (Vilniaus Gedimino technikos universitetas, Mechanikos inžinerija-T 009), doc. dr. Nomeda JUODŽIUKYNIENĖ (Lietuvos sveikatos mokslų universitetas, Veterinarija-A 002), prof. dr. Arnas KAČENIAUSKAS (Vilniaus Gedimino technikos universitetas, Mechanikos inžinerija-T 009), prof. dr. Jerzy ROJEK (Lenkijos mokslų akademijos fundamentinių technologinių tyrimų institutas, Mechanikos inžinerija-T 009). Disertacija bus ginama viešame Mechanikos inžinerijos mokslo krypties disertacijos gynimo tarybos posėdyje 2024 m. liepos 5 d. 9 val. Vilniaus Gedimino technikos universiteto SRA-I posėdžių salėje.

Research paper thumbnail of Quantitative Analysis of Stress–Stretch Curves in Canine Lumbar Vertebrae Using Modified Logistic Functions

Bioengineering, May 20, 2024

This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY

Research paper thumbnail of Experimental and theoretical investigation of aortic wall tissue in tensile tests

Technology and Health Care, Nov 15, 2023

BACKGROUND: Understanding the mechanical properties of aortic tissue is essential for developing ... more BACKGROUND: Understanding the mechanical properties of aortic tissue is essential for developing numerical computation tools and assessing the risk of aortic aneurysm fractures. Tensile tests using aortic wall specimens allow for the determination of stress and strain depending on the location and direction of the sample. OBJECTIVE: The aim of this study was to perform a mechanical tensile test using canine aorta samples and create a numerical model of aortic tissue tension from the processed data. METHODS: Dogbone-shaped samples were dissected from canine aortic segments. The initial measurements were made at zero tension and the tensile tests were conducted at 10 mm/min until rupture. Force and stretch data were used to obtain engineering and true stress-strain curves. The true stress-strain curves were taken until the maximum strength was obtained, after which they were smoothed and fitted using a logistic function with three coefficients. These curves were then used as material mechanical properties for a numerical model of the aortic tissue tension. A simplified rectangle form was used to mimic the middle of the dogbone-shaped portion of the tissue specimen. Experimental displacement data were collected for the boundary conditions of the finite element 3D model. RESULTS: The experimental data processing revealed that the logistic function described the nonlinear behaviour of the aorta soft tissue with an accuracy of 95% from the start of the tension to the media layer rupture. By applying numerical simulations, we obtained a correspondence of the load curve with an RMSE = 0.069 for the theoretical and experimental external tension data. CONCLUSION: The numerical investigation confirmed that the non-linear soft tissue was validated by applying a logistic function approach to the mechanical properties of the aortic wall.

Research paper thumbnail of Finite Element Model of Canine-Specific Vertebrae Incorporating Biomechanical Tissue Nonlinearity

Applied sciences, Feb 29, 2024

This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY

Research paper thumbnail of Histomorphometry and μCT scan analysis of osteoporosis in spayed female dogs

Open Veterinary Journal

Background: Both humans and small animals suffer from similar metabolic and structural diseases t... more Background: Both humans and small animals suffer from similar metabolic and structural diseases that impact the musculoskeletal system; however, instead of studying animal disease in its own right, animals are more often used as models for research into various human ailments, such as osteoporosis. There are few studies indicating that animals may suffer from osteoporosis, which raises the question of why small animals, which we believe to be equally susceptible, receive so little attention. With this research, we hope to draw the attention of researchers to the fact that the examination of animals for this disease is just as important as the examination of humans; human osteoporosis research receives a great deal of attention, while animals and their health are neglected. Aims: We aimed to analyse the bone volume fraction (BV/TV) and thickness of first (L1) and second (L2) lumbar vertebrae samples from five cadavers using histomorphometric analysis. In addition, we aimed to investi...

Research paper thumbnail of Ilizarov's apparatus method analysis in the small animal surgery

The Master‘s thesis consisted of: 49 pages, in which there are 22 pictures, 2 tables, there were ... more The Master‘s thesis consisted of: 49 pages, in which there are 22 pictures, 2 tables, there were used 58 literature sources and included 1 appendix. A retrospective case-study study was carried out in the X small animal clinic which applies the G. A. Ilizarov‘s external skeletal fixation‘s technique when there was diagnosed a bone fracture in the limb. For the case analysis there was created a survey, later computer database was created for saving and analysing clinical cases purposes. While collecting the information during the research for the traumatised animals there were a lot of examinations performed: general clinical, orthopedic, X-ray examinations, morphological and biochemical blood tests. There were collected information about: animal‘s breed, sex, age. Rentgenograms were analised for these aspects: a body side, a fractured limb bone, a fractured zone and a fractured type. There were also evaluated the influence for these factors and healing duration. To analise external ...

Research paper thumbnail of Ilizarovo aparato taikymo analizė smulkiųjų gyvūnų chirurgijoje

Research paper thumbnail of Monopolar electrocautery use in minimally invasive urosurgery: case report of ectopic ureter management in a bitch

Open Veterinary Journal, 2022

Research paper thumbnail of Empirical case report of the mechanical properties of three spayed canine lumbar vertebrae

Open Veterinary Journal

Background: Today, animals, like humans, suffer from spinal illnesses, which are aggravated in ol... more Background: Today, animals, like humans, suffer from spinal illnesses, which are aggravated in old age. Much emphasis is placed on diagnosis and treatment, but little focus is given to the spine's mechanical properties. Degenerative spine diseases are a major problem throughout the world. According to the World Health Organization, osteoporosis is a world-class public problem that reduces bone mass, resulting in bone fracturing and increased risk of bone fracturing. Therefore, the mechanical investigation of vertebrae can provide more information about the development of osteoporosis. Case Description: For our case report, we used spayed mongrel lumbar vertebrae samples obtained from a canine which was about 8 years old and weighed 28 kg. The dog was diagnosed with a mammary tumour, and the dog’s owners decided to euthanise the dog. All consent forms were filled. Conclusions: Mechanical tests were performed on three vertebrae, and a noticeable difference was observed in the firs...