Investigation of stress-strain state in spinal model for various methods of surgical treatment of thoracolumbar burst fractures (Рart one)

Radchenko, Volodymyr; Popsuishapka, Konstantin; Yaresko, Oleksandr

doi:10.15674/0030-59872017127-33

Cited by 5 publications

(4 citation statements)

References 4 publications

(4 reference statements)

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“…The model of the spine, developed in the laboratory of biomechanics of the State Institution Professor M. I. Sytenko Institute of Spine and Joint Pathology of the National Academy of Sciences of Ukraine, was taken as the basis for the construction of the calculation model [5][6][7]. On the basis of information about the properties of the ribs provided by R. Schwend, Z. Li [8,9], and the anatomical features of their functional movement [10,11], a calculated finite element model was created in the norm (Fig.…”

Section: Methodsmentioning

confidence: 99%

Study of the Distribution of Stresses in the Elements of the Sterno-Costal Complex and Metal Plates in the Case of Minimally Invasive Correction of the Funnel-Shaped Deformation of the Chest According to Nuss

Pylypko,

Levytskyi,

Karpinsky

et al. 2023

OTP

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In severe forms, funnel-shaped chest deformity (FSCD) requires surgical correction. The method of choice is the Nuss operation and its modifications. Objective. To study the changes that occur in the stressed-deformed state of the chest model and the fixator under different methods of its implementation during the minimally invasive correction of FSCD according to Nuss. Material and methods. 4 schemes of FSCD correction were modeled: 1 — alignment with one retrosternal plate with transverse stabilizers, the point of entry and exit of the fixator is located parasternal at the level of the bone-cartilage transition, the fixator on the sides of the chest ends at the level of the front axillary line; 2 — sternal plate with transverse stabilizers, the point of entry and exit is located at the level of the front armpit line, the fixator ends at the level of the middle armpit line; 3 — the use of a double plate with transverse bars that connect the plates with the help of screws with medial conduction; 4 — a double plate with transverse slats, which connect the plates with the help of screws with lateral guidance. The models were loaded with a distributed force of 100 N applied to the sternum. The results. When using FSCD correction schemes, the maximum level of stress occurs in the metal plates, because they bear the main loads from the sternum, which tries to return to its original position after correction. The same reason causes the highest level of stress among the elements of the skeleton in the sternum. Conclusions. Under the conditions of using any FSCD correction scheme, the maximum stress level occurs in the metal plates, sternum, fifth and sixth ribs, which are in direct contact with the plates. The use of long plates with lateral points leads to a slight decrease in stress values in all elements of the model. The «Bridge» fastener allows you to significantly reduce the level of stress, both in the plates themselves and in the elements of the skeleton due to an increase in their contact area.

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Section: Methodsmentioning

confidence: 99%

Study of the Distribution of Stresses in the Elements of the Sterno-Costal Complex and Metal Plates in the Case of Minimally Invasive Correction of the Funnel-Shaped Deformation of the Chest According to Nuss

Pylypko,

Levytskyi,

Karpinsky

et al. 2023

OTP

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“…Раніше [5] нами розглянуто використання задніх транспедикулярних конструкцій різної протяжності: побудовано кінцево-елементні моделі (КЕМ) вибухового перелому тіла хребця Тh XII і проведено порівняльний аналіз їхнього напружено-деформованого стану (НДС) за умов різних видів фіксації.…”

Section: вступunclassified

“…Існує достатня кількість суперечливих моментів у проблемі остеосинтезу хребта, що спонукає нас до проведення досліджень у цьому напряму. Перш за все, це питання використання короткої транспедикулярної фіксації, ефективності застосування передньої міжтілової опори [3,5,9,10]. Для аналізу складних біомеханічних систем, які передбачають рішення диференціальних рівнянь у частинних похідних, необхідно використовувати методи чисельного моделювання.…”

Section: вступunclassified

“…У літературі [5,7,8] описано принципи побудови різних КЕМ хребта і порівняно їх з експериментальними даними, проте для моделей із варіантами руйнації різних відділів хребта і су-міжних дисків таких досліджень мало. Зокрема, N. A. Langrana і співавт.…”

Section: вступunclassified

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Study of stress and strain state distribution of spinal model in surgical techniques for various techniques for thoracolumbar burst fractures (part two)

Radchenko¹,

Popsuishapka²,

Yaresko³

2017

ORTHOPAEDICS, TRAUMATOLOGY and PROSTHETICS

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Дослідження напружено-деформованого стану моделі хребта за різноманітних методик хірургічного лікування вибухових переломів грудопоперекового відділу (частина друга) В. О. Радченко, К. О. Попсуйшапка, О. В. Яресько ДУ «Інститут патології хребта та суглобів ім. проф. М. І. Ситенка НАМН України», Харків При выборе тактики хирургического лечения взрывных переломов нижнегрудного и поясничного отделов позвоночника проблемными остаются вопросы о протяженности фиксации, возможности коррекции деформации, целесообразности выполнения ламинэктомии. Цель: построить конечно-элементные биомеханические модели взрывного перелома тела ТhXII позвонка с 100 % его поражением в блоке позвонков ThIX-LV и проанализировать напряженно-деформированное состояние при разных видах фиксации. Методы: созданы четыре расчетные модели блока позвонков ThIX-LV: 1) замена разрушенного тела позвонка межтеловой опорой, разрушение дуг позвонков и фиксация позвонков ThХ, ThХІ, LІ, LІІ транспедикулярной конструкцией (ТПК); 2) разрушение 100 % объема тела позвонка ТhXII и фиксация позвонков ThХ, ThХІ, LІ, LІІ ТПК; 3) замена разрушенного позвонка межтеловой опорой, разрушение дуг позвонка ТhXII и фиксация позвонков ThХI и LI ТПК; 4) замена разрушенного позвонка межтеловой опорой. Результаты: установлено, что основную нагрузку несет ТПК, максимальные напряжения обнаружены в задних отделах позвоночника (до 6 МПа) и участках стержней между позвонками (36,7 МПа в зависимости от модели). При использовании для фиксации 8 винтов без межтеловой опоры уровень напряжений значительно увеличивался: в области «винт -кость» -более чем в 2 раза, в стержнях -на 70 %. В случае использования 4 винтов уровень напряжений в участке заднего опорного комплекса в среднем возрос на 10-40 %. Выводы: в блоках позвонков наиболее напряженными являются задние отделы позвоночника и участки стержней между позвонками. Использование спондилодеза на 360º увеличивает нагрузку в зоне «винт -кость», а только межтеловой опоры -в области задних отделов позвоночника. Ключевые слова: взрывные переломы, грудной и поясничный отделы позвоночника, метод конечных элементов, напряженнодеформированное состояние, транспедикулярная фиксация. © Радченко В. О., Попсуйшапка О. К., Яресько О. В., 2017 Ключові слова: вибухові переломи, грудний і поперековий відділи хребта, метод кінцевих елементів, напружено-деформований стан, транспедикулярна фіксація

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Study of the stress-strain state of the posterior lumbar fusion models in case of normal indicators of the sagittal balance of the spine and pelvis

Popsuyshapka,

Kovernyk,

Pidgayska

et al. 2023

TRAUMA

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Background. Patients suffering from hip-spine syndrome with significant changes in the hip joint complain of pain in the lumbar spine in 21.2–49.4 % of cases. After performing lumbar fusion, the mobility of the pelvis decreases, which leads to an increased risk of dislocations and the development of impingement after hip arthroplasty that is the cause for repeated surgical interventions. Goal: to study the stress distribution in the models of posterior lumbar fusion in case of normal values of the sagittal contour of the spine and lumbar lordosis. Materials and methods. A finite-element model has been developed reflecting the condition that occurs in the combined course of degenerative diseases of the lumbar spine and hip joint and is characterized by normal lordosis of 40º and forward body tilt due to flexion contracture in the hip joints. The following options were modeled: 1 — posterior fusion of the L4-L5 vertebrae using a transpedicular structure with 4 screws and an interbody support; 2 — posterior fusion of the L3-L4-L5 vertebrae using a transpedicular construction with 6 screws; 3 — posterior fusion of L1-L5 vertebrae using a transpedicular structure with 10 screws. When conducting the research, the values of stresses in the Th1-L5 vertebrae, on the screws and rods of the transpedicular structure were studied. Results. Posterior fusion with a transpedicular construction on two L4-L5 vertebrae leads to the occurrence of maximum stresses in vertebral bodies of the lumbar spine, especially L4-L5. The lowest stresses in the lumbar vertebral bodies can be obtained when the transpedicular structure is applied to all 5 vertebrae. The use of all options for posterior fusion, except for the 4-screw scheme, allows to reduce the stress in the vertebral arches of the lumbar spine below the level of the normal spine model, except for the L1 vertebra. This leads to an increase in the level of stress from the Th6 to Th12 vertebrae. The construction placed on all 5 vertebrae ensures the lowest level of stress in the arches of thoracic vertebrae. The construction placed on all the vertebrae of the lumbar spine provides a minimum level of stress in the bone tissue around the fixing screws. Reducing the length of fixation leads to a significant increase in stress in these zones. With all types of installation of the transpedicular construction, the values of the stresses on the screws in the L3-L5 vertebrae are comparable. When using the design for 5 vertebrae of the lumbar spine, the locking screws in the L1 and L2 vertebrae will experience significant loads, which, accordingly, will cause significant stress in them. The maximum level of stress in the rods occurs when two L4-L5 vertebrae are instrumented, the minimum is when the structure is placed on all five vertebrae of the lumbar spine. Conclusions. Given the stress distribution, the length of fixation plays an important role: the longer the length of fixation, the lower the stress level, both in the bone elements of the model and in the elements of metal structures.

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Investigation of stress-strain state in spinal model for various methods of surgical treatment of thoracolumbar burst fractures (Рart one)

Cited by 5 publications

References 4 publications

Study of the Distribution of Stresses in the Elements of the Sterno-Costal Complex and Metal Plates in the Case of Minimally Invasive Correction of the Funnel-Shaped Deformation of the Chest According to Nuss

Study of the Distribution of Stresses in the Elements of the Sterno-Costal Complex and Metal Plates in the Case of Minimally Invasive Correction of the Funnel-Shaped Deformation of the Chest According to Nuss

Study of stress and strain state distribution of spinal model in surgical techniques for various techniques for thoracolumbar burst fractures (part two)

Study of the stress-strain state of the posterior lumbar fusion models in case of normal indicators of the sagittal balance of the spine and pelvis

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