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Relevant bibliographies by topics / Lumbar vertebrae

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Academic literature on the topic 'Lumbar vertebrae'

Author: Grafiati

Published: 4 June 2021

Last updated: 31 July 2024

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Journal articles on the topic "Lumbar vertebrae"

1

DZIERZĘCKA, MAŁGORZATA, SŁAWOMIR PAŚKO, IZA WADOWSKA, TOMASZ KOWALUK, IWONA ŁUSZCZEWSKA-SIERAKOWSKA, and ANNA CHARUTA. "Relation between defects in the lumbar spine and the position and dimensions of individual vertebrae in German Shepherds." Medycyna Weterynaryjna 79, no. 09 (2023): 6792–2023. http://dx.doi.org/10.21521/mw.6792.

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The German Shepherd is among the breeds most prone to pathologies of the lumbosacral spine. The aim of the study was to examine how the presence of spine pathology affects the shape of the lumbar spine and dimensions of individual vertebrae. Mathematical analysis consisted of three measurements for each lumbar vertebra. Based on the analysis, it was concluded that there was a correlation between the height of the first five vertebrae and the occurrence of the lumbosacral transitional vertebra (LTV). It was also shown that spondylosis manifested most often with a change in the distance between individual lumbar vertebrae. There was no correlation between the incidence of spondylosis and the height of the vertebral canal. In conclusion, the presence of a LTV significantly changes the dimensions of other vertebrae in the lumbar spine, which can lead to other pathological changes in the vertebral column.

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Leonova, O. N., E. S. Baikov, and A. V. Krutko. "Bone mineral density of lumbar vertebrae in patients with degenerative spinal diseases." Genij Ortopedii 28, no. 5 (October 2022): 692–97. http://dx.doi.org/10.18019/1028-4427-2022-28-5-692-697.

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Introduction Bone mineral density (BMD) of the vertebrae is a critical issue before performing stabilizing interventions at the lumbar level. Determination of BMD in Hounsfield units (HU) according to CT data is a more accurate method versus to the "gold" standard – densitometry. Purpose To determine BMD of key anatomical areas of the lumbar vertebrae in HU and correlate with densitometry data. Methods A retrospective cohort of patients was studied prior to decompression and stabilization intervention at the lumbar level. The BMD of each lumbar vertebra in its different anatomical regions in HU was assessed according to CT of the lumbar spine and was compared with densitometry data. Results In the roots of the L2-S1 arch of the vertebrae, BMD was significantly higher than in the bodies of the same vertebrae (p < 0.01); in the L1 and S1 vertebrae, the difference in BMD between the body and the roots of the arch was not significant. An increase in the density of bone tissue in the vertebral bodies to the underlying levels was determined; BMD in the roots of the arch also increases, but only up to the L5 vertebra. BMD in the roots of the arch of the S1 vertebra is significantly lower than in the overlying L5 vertebra (p = 0.032). Discussion The obtained findings supplement the reported data in the current literature. The HU value is a more accurate and significant parameter of BMD, which should be considered in the practice by a spinal surgeon. Conclusions According to CT data of the lumbar spine, the BMD of L2-L5 in the arch roots is significantly higher than in the vertebral bodies. The BMD of the S1 vertebra in the arch roots is significantly lower than in the L5 vertebra. It may be the reason of high failure rate of caudal fixation at this level. Particular attention should be paid to the planning and surgical techniques in patients not only with osteoporosis but also with osteopenia. BMD findings obtained by densitometry in these conditions do not have a significant difference.

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Lee, Hsieh-Hsing, Shing-Sheng Wu, Shih-Youeng Chuang, Tsu-Te Yeh, and Po-Quang Chen. "BIOMECHANICAL EVALUATION OF TRANSPEDICULARLY PLACED INTRAVERTEBRAL SUPPORT FOR THE MANAGEMENT OF OSTEOPOROTIC VERTEBRAL COMPRESSION FRACTURES." Journal of Musculoskeletal Research 11, no. 01 (March 2008): 37–43. http://dx.doi.org/10.1142/s0218957708001936.

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This in vitro biomechanical study reports on a new implant, called an intravertebral expandable pillar (IVEP). The implant is aimed at restoring the height and strength of collapsed vertebra after fracture in an osteoporotic patient. The hypothesis is that the IVEP can effectively restore the body height of the compressed vertebra and provide proper stiffness for the collapsed vertebra. Although the reported complication rate of percutaneous vertebroplasty by injection of polymethylmethacrylate (PMMA) is low, the sequelae are severe; other potential adverse effects of PMMA injection into the vertebral body include thermal necrosis of the surrounding tissue caused by a high polymerization temperature, and lack of long-term biocompatibility. We test the mechanical properties before and after fracture of 14 human cadaver lumbar vertebrae by a material testing system. The fractured vertebra was implanted with the IVEP, and its mechanical properties tested. The vertebral body height at each stage was evaluated by a digital caliper and radiographic films. After IVEP implantation, the vertebral body height restoration rate was 97.8%. The vertebral body height lost 12.7% after the same loading to create fracture. The vertebra lost half of its strength after compressed fracture, while IVEP implantation restored 86.4% of intact vertebra strength. The stiffness of intact vertebrae was significantly greater than that of untreated vertebrae after fracture and fractured vertebrae with IVEP treatment, while the stiffness of fractured vertebrae after IVEP treatment was significantly greater than that of untreated vertebrae after fracture. The bipedicularly implanted IVEP restores the initial height and strength of the vertebral body following an induced compression fracture, and could be used by a minimally invasive procedure to treat lumbar vertebra compression factures and avoid the disadvantage of using bone cement in vertebroplasty or kyphoplasty.

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Hurtado-Avilés, José, Vicente J. León-Muñoz, Pilar Andújar-Ortuño, Fernando Santonja-Renedo, Mónica Collazo-Diéguez, Mercedes Cabañero-Castillo, Ana Belén Ponce-Garrido, et al. "Validity and Absolute Reliability of Axial Vertebral Rotation Measurements in Thoracic and Lumbar Vertebrae." Applied Sciences 11, no. 23 (November 23, 2021): 11084. http://dx.doi.org/10.3390/app112311084.

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Axial vertebral rotation (AVR) and Cobb angles are the essential parameters to analyse different types of scoliosis, including adolescent idiopathic scoliosis. The literature shows significant discrepancies in the validity and reliability of AVR measurements taken in radiographic examinations, according to the type of vertebra. This study’s scope evaluated the validity and absolute reliability of thoracic and lumbar vertebrae AVR measurements, using a validated software based on Raimondi’s method in digital X-rays that allowed measurement with minor error when compared with other traditional, manual methods. Twelve independent evaluators measured AVR on the 74 most rotated vertebrae in 42 X-rays with the software on three separate occasions, with one-month intervals. We have obtained a gold standard for the AVR of vertebrae. The validity and reliability of the measurements of the thoracic and lumbar vertebrae were studied separately. Measurements that were performed on lumbar vertebrae were shown to be 3.6 times more valid than those performed on thoracic, and with almost an equal reliability (1.38° ± 1.88° compared to −0.38° ± 1.83°). We can conclude that AVR measurements of the thoracic vertebrae show a more significant Mean Bias Error and a very similar reliability than those of the lumbar vertebrae.

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Men’shchikova, I. A. "Osteometry of the human spine at the age of maturity in the Ural region." Kazan medical journal 100, no. 4 (July 31, 2019): 622–28. http://dx.doi.org/10.17816/kmj2019-622.

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Aim. To reveal the patterns of the changes of osteometric characteristics of the adults living in the Ural region. Methods. 56 cadavers of human beings at the age of maturity were analyzed (28 women aged 21 to 55 years, and 28 men aged 22 to 60 years) being the residents of the Ural region. The scheme recommended by the Symposium on Age Periodization at the Institute of Age Physiology in 1969, was used for distribution by age groups. Osteometry and statistical method were used. Results. In the cervical spine, the greatest sagittal size was determined in the spinal process of the VII cervical vertebra (30.9±1.79 mm), in the thoracic spine — in the VII thoracic vertebra (41.5±2.4 mm), and in lumbar spine — in the III lumbar vertebra (36.4±0.95 mm). The frontal size of vertebral bodies increased from overlying vertebrae to underlying ones, however, the decrease in the frontal size of vertebral bodies was noted from the I thoracic to the VI thoracic vertebra, and starting from the VII thoracic vertebra its further increase was observed. The sagittal size of vertebral body increased only from the II cervical vertebra to the III lumbar one. The sagittal size of the bodies of the III–V vertebrae was within the range of 32–34 mm. The sizes of vertebral arch pedicle allow conducting the transpedicular fixation at the level of all vertebrae, but it should be taken into account that in V and VI thoracic vertebrae frontal size of arch pedicle is the least as compared to other levels. The frontal sizes of spinal canal were more than sagittal ones at the levels of all vertebrae, with the exception of atlas and the V thoracic vertebra. Conclusion. The results can serve as the basis for performing any surgical interventions on the spine and as the norm for evaluation of its pathological changes.

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Phansangiemjit, Amonsiri, Kamolphatra Kasemjiwat, Krit Patchanee, Yossapat Panninvong, Ana Sunisarud, Nan Choisunirachon, and Chutimon Thanaboonnipat. "The Differences in Radiographic Vertebral Size in Dogs with Different Chest and Skull Types." Animals 14, no. 3 (January 31, 2024): 470. http://dx.doi.org/10.3390/ani14030470.

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The objective of this study was to elucidate the differences in vertebral length, vertebral height, and vertebral length/height ratio of the fourth thoracic vertebra (T4), the second lumbar vertebra (L2), the fifth lumbar vertebra (L5) and the seventh lumbar vertebra (L7) based on radiographs in dogs with various body sizes, skull types, and thoracic conformations and to determine the relationships of these parameters with age and sex. A total of 258 dogs were included in this study and classified by three criteria—BW (Criterion 1), skull type (Criterion 2), and thoracic conformation (Criterion 3). Age had weak negative correlations with vertebral length and height. Sex did not affect the vertebral size parameters. BW had strong positive correlations with vertebral length and height, but there was no influence of BW on vertebral length/height ratio. Regarding the different body sizes and conformations, large breeds had vertebrae with significantly greater length and height than small and medium breeds (p < 0.001). In Criterion 2, the vertebrae of the mesocephalic dogs had significantly greater length and height than those of the brachycephalic and dolichocephalic dogs (p < 0.05). In Criterion 3, both deep-chest and round-chest dogs had vertebrae with significantly greater length and height than the barrel-chest dogs (p < 0.0001). Only vertebral length/height ratios of T4 were not influenced by age, sex, BW, skull type, and thoracic conformation. Age, differences in body size, skull type, and thoracic conformation could affect the vertebral size in dogs. Therefore, using breed-specific vertebral lengths and/or heights is a better approach for comparative radiographic analysis with vertebral measurements.

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Kottlors, Michael, and Franz Xaver Glocker. "Dermatomyotomal supply in patients with variations in the number of lumbar vertebrae." Journal of Neurosurgery: Spine 12, no. 3 (March 2010): 314–19. http://dx.doi.org/10.3171/2009.9.spine09114.

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Object Variation in the number of lumbar vertebrae occurs in a small portion of the population. Either the fifth lumbar vertebra shows assimilation to the sacrum or the first sacral vertebra shows a lumbar configuration, resulting in 4 or 6 lumbar vertebrae, respectively. Etiologically, lumbar nerve root syndrome is diagnosed by comparing the anatomical level of the disc herniation to the compressed nerve root and to the pattern of the peripheral sensory and motor deficit. In case of a variation in the number of lumbar vertebrae, defining the lumbar nerve roots becomes difficult. Variations in the number of lumbar vertebrae make the landmarks (the twelfth rib and the first sacral vertebra) unreliable clues to define the nerve roots. The allocation of the clinically damaged segment to the spinal disorder seen in imaging studies is essential for differential diagnosis and spine surgery. Methods A retrospective study was conducted of clinical, electrophysiological, and imaging data among inpatients over a period of 21 months. Eight patients who had isolated monosegmental discogenic nerve root compression and a variation in the number of lumbar vertebrae were selected. Results Seven patients presented with 6 lumbar vertebrae, and 1 patient presented with 4 lumbar vertebrae and disc herniation on 1 of the 2 caudal levels. Compression of the second-to-last nerve root in patients with 6 lumbar vertebrae resulted either in clinical L-5 or S-1 syndrome, or a combination of both. Compression of the last caudal nerve root resulted in a clinical S-1 nerve root syndrome. Conclusions The findings suggest that the dermatomyotomal supply of the lumbosacral nerve roots can vary in patients with a variation in the number of lumbar vertebrae, and a meticulous clinical, radiological, and electrophysiological examination is essential.

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Popsuyshapka, K. O., O. V. Kovernyk, O. O. Pidgayska, M. Yu Karpinsky, and O. V. Yaresko. "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." TRAUMA 24, no. 2 (September 4, 2023): 4–13. http://dx.doi.org/10.22141/1608-1706.2.24.2023.939.

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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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Kumari, V. Anantha, and Syeda Nasreen. "BLOCK VERTEBRAE OF 5TH LUMBAR AND 1ST SACRAL VERTEBRA." International Journal of Anatomy and Research 6, no. 4.3 (December 5, 2018): 6009–13. http://dx.doi.org/10.16965/ijar.2018.395.

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Ahmed, Rania Jamal, Numan Salman Dawood, and Maan Hamad Al-Khalisy. "The Relationship between Anemia and Bone Mineral Density Measured by Dual X-Ray Absorptiometry." Al-Rafidain Journal of Medical Sciences ( ISSN 2789-3219 ) 6, no. 2 (May 31, 2024): 111–15. http://dx.doi.org/10.54133/ajms.v6i2.800.

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Background: The bone mineral density of the lumbar vertebra has been assessed according to the results of the Dual-Energy X-Ray Absorptiometry (DEXA). Although anemia is known to affect bone mineral density, at the present time, it is not clear which vertebra is more affected by this disease. Objective: To evaluate the effects of anemia on the bone mineral density of the lumbar vertebra in comparison with a normal subject and determine which part of the lumbar vertebra is more affected by anemia. Methods: All 205 participants in this study complained of bone pain (90 males and 105 females). 95 patients, including both sexes, suffered from anemia. Additionally, the study included 110 seemingly healthy volunteers as the control group. All participants were studied regarding their bone mineral density for lumbar vertebrae using dual-energy x-ray absorptiometry. Results: The DEXA outcomes revealed highly statistically significant differences between the control and patients of each lumbar vertebra in the same sex. In addition, there were significant differences in bone mineral density among the lumbar vertebrae of the same sex. Conclusions: Our findings suggest that examining the bone mineral density of the lumbar vertebrae is a more effective and appropriate method for studying the bone mineral density (BMD) of the bony skeleton in any subject, with L1 and L4 vertebrae being more susceptible to osteoporosis than other vertebrae.

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Dissertations / Theses on the topic "Lumbar vertebrae"

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Jönsson, Bo. "Lumbar nerve root compression syndromes symptoms, signs and surgical results /." Lund : Dept. of Orthopedics, University Hospital, 1995. http://catalog.hathitrust.org/api/volumes/oclc/38155579.html.

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Axelsson, Paul. "On lumbar spine stabilization." Lund : Dept. of Orthopedics, Lund University Hospital, 1996. http://catalog.hathitrust.org/api/volumes/oclc/38045390.html.

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Goubeaux, Craig A. "The Accuracy of Measuring Lumbar Vertebral Displacements Using a Dynamic MRI Sequence." Ohio University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1480436812645944.

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Wong, Peter. "Biomechanical comparison of lumbar disc replacements." View the abstract Download the full-text PDF version, 2009. http://etd.utmem.edu/ABSTRACTS/2009-014-Wong-index.htm.

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Thesis (M.S.)--University of Tennessee Health Science Center, 2009.
Title from title page screen (viewed on October 8, 2009). Research advisor: Denis DiAngelo, Ph.D. Document formatted into pages (viii, 75 p. : ill.). Vita. Abstract. Includes bibliographical references (p. 34-38).

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Leja, Eliza. "Analysis of spatial discrimination in the lumbar spine of normal man." Thesis, Uppsala universitet, Statistiska institutionen, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-226986.

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A clinical study was performed in order to determine if healthy test subjects can differentiate between adjacent and separated pairs of vertebrae in the lumbar spine. The variable of interest was number of correctly specied pairs of vertebrae. The test subjects were evaluated in terms of sensitivity and specicity of this test. Bootstrap resampling was applied in the data analysis. The results clearly indicated that the test subjects in this study were able to successfully determine whether a pair of adjacent or separated vertebrae was tested during the procedure.

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Smith, April K. "Aging of the Lumbar Vertebrae Using Known Age and Sex Samples." Digital Archive @ GSU, 2010. http://digitalarchive.gsu.edu/anthro_theses/45.

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The dimensions of the lumbar vertebrae are examined in order to determine if these measurements can be used to predict the age of an individual, and if the lumbar vertebrae exhibit sexual dimorphism. Various statistical techniques were utilized to analyze several dimensions of the lumbar vertebrae. Aging patterns in the lumbar elements are distinct between males and females, and females exhibit compression of the L3 element, which may be related to vertebral wedging. Some dimensions of the lumbar vertebrae are sexually dimorphic.

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Zheng, Yalin. "Automated segmentation of lumbar vertebrae for the measurement of spine kinematics." Thesis, University of Southampton, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.288154.

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Gunji, Harumoto. "Analyses of Aging Changes in Lumbar Vertebrae of Primates with DXA." 京都大学 (Kyoto University), 2003. http://hdl.handle.net/2433/149155.

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Siqueira, Dayana Pousa Paiva de. "Análise fotoelástica de modelo de vértebra sob influência de parafuso pedicular." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/17/17142/tde-28052008-142816/.

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O sistema de fixação vertebral utilizando o parafuso pedicular é um dos métodos mais eficientes no tratamento de patologias da coluna vertebral. Quando o parafuso estiver submetido à força de arrancamento, ele gera tensões ao redor, principalmente próximo do canal medular, situação que pode ser analisada pela técnica da fotoelasticidade. O objetivo foi analisar as tensões internas geradas em modelos fotoelásticos de vértebras, utilizando diferentes medidas de parafusos do sistema de fixação vertebral, submetidos à força de arrancamento. Foi utilizado um modelo de vértebra lombar em material fotoelástico utilizando três medidas de diâmetros externos de parafusos pediculares (5, 6 e 7mm) do tipo USS1. As tensões internas ao redor do parafuso foram avaliadas em 18 pontos pré-determinados utilizando um polariscópio de transmissão plana. As regiões de maiores concentrações de tensões foram observadas entre o canal medular e as curvas do processo transverso. Nas comparações das médias das tensões cisalhantes entre os parafusos 5 e 7mm, e 6 e 7mm foram observadas diferenças estatísticas significativas, o que não ocorreu com os parafusos de 5 e 6mm onde não foram observadas diferenças estatisticamente significativas. Foi observado que as tensões internas são mais elevadas em áreas irregulares próximas do canal medular, o que sugere ser uma região crítica, em termos de esforços mecânicos.
The system of vertebrae fixation using the pedicular screw is one of the most efficient methods to treat vertebral spine pathologies. When the screw is submitted to pullout strength, it causes internal stress near the medullary canal and this situation can be analyzed using the photoelasticity technique. The objective of this study was to examine the internal stress of a photoelastic vertebrae model using different sizes of screws for the vertebral fixation submitted to pulling out. A lumbar vertebral model made of photoelastic material with three different pedicular screw sizes (5, 6 and 7mm), type USS1 was used. The internal stress around the screw were tested in 18 pre established points by a plain transmission polariscope. The areas of greater concentration of stress were placed between the medullary canal and the transverse process. Comparing the maximum average pulling out stress, statistical differences were observed between screws 5 and 7, and 6 and 7. On the other hand, when screws 5 and 6mm where compared no significant differences were found. This study identified that the internal stress are greater in irregular areas, near the medullary canal, suggesting that this may be a critical region.

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Pothuganti, Virabadra Phani Raju P. K. "Feasibility study of ultrasound measurements on the human lumbar spine." Auburn, Ala., 2006. http://hdl.handle.net/10415/1302.

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Books on the topic "Lumbar vertebrae"

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B, Camins Martin, and O'Leary Patrick F, eds. The Lumbar spine. New York: Raven Press, 1987.

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1942-, Andersson Gunnar, and McNeill Thomas W. 1936-, eds. Lumbar spinal stenosis. St. Louis: Mosby Year Book, 1991.

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G, Watkins Robert, and Collis John S, eds. Lumbar discectomy and laminectomy. Rockville, Md: Aspen Publishers, 1987.

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Warren, Williams Robert, McCulloch John A, and Young Paul H. 1950-, eds. Microsurgery of the lumbar spine. Rockville, Md: Aspen Publishers, 1990.

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Bogduk, Nikolai. Clinical anatomy of the lumbar spine. Melbourne: Churchill Livingstone, 1987.

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Robert, Gunzburg, and Szpalski Marek, eds. Lumbar disk herniation. Philadelphia: Lippincott Williams & Wilkins, 2002.

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W, Hardy Russell, ed. Lumbar disc disease. 2nd ed. New York: Raven Press, 1993.

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Lund, Tekniska högskolan i., ed. Mechanical stability of the human lumbar spine. Lund: Institute of technology, Department of Solid Mechanics, 1987.

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Postacchini, Franco. Lumbar spinal stenosis. Wien: Springer-Verlag, 1989.

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1947-, Yonenobu K., Ono Keirō, and Takemitsu Y. 1930-, eds. Lumbar fusion and stabilization. Tokyo: Springer, 1993.

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Book chapters on the topic "Lumbar vertebrae"

1

Bab, Itai, Carmit Hajbi-Yonissi, Yankel Gabet, and Ralph Müller. "Lumbar Vertebrae." In Micro-Tomographic Atlas of the Mouse Skeleton, 73–78. Boston, MA: Springer US, 2007. http://dx.doi.org/10.1007/978-0-387-39258-5_5.

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Latimer, Bruce, and Carol V. Ward. "The Thoracic and Lumbar Vertebrae." In The Nariokotome Homo Erectus Skeleton, 266–93. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-662-10382-1_12.

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Hutt, Hugo, Richard Everson, and Judith Meakin. "Segmentation of Lumbar Vertebrae Slices from CT Images." In Recent Advances in Computational Methods and Clinical Applications for Spine Imaging, 61–71. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-14148-0_6.

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Nishigaki, Hidekazu, Tatuyuki Amago, Kazuo Miki, Shin-ichi Ishiyama, Eiichi Tanaka, and Sota Yamamoto. "Fundamental Study of Dynamic Analysis of Lumbar Vertebrae." In Human Biomechanics and Injury Prevention, 243–48. Tokyo: Springer Japan, 2000. http://dx.doi.org/10.1007/978-4-431-66967-8_33.

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Lootus, Meelis, Timor Kadir, and Andrew Zisserman. "Vertebrae Detection and Labelling in Lumbar MR Images." In Lecture Notes in Computational Vision and Biomechanics, 219–30. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-07269-2_19.

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Wong, Shu-Fai, Kwan-Yee Kenneth Wong, W. N. Kris Wong, C. Y. John Leong, and D. K. Keith Luk. "Tracking Lumbar Vertebrae in Digital Videofluoroscopic Video Automatically." In Lecture Notes in Computer Science, 154–62. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-540-28626-4_19.

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Forsberg, Daniel. "Atlas-Based Segmentation of the Thoracic and Lumbar Vertebrae." In Recent Advances in Computational Methods and Clinical Applications for Spine Imaging, 215–20. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-14148-0_18.

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Ibragimov, Bulat, Robert Korez, Boštjan Likar, Franjo Pernuš, and Tomaž Vrtovec. "Interpolation-Based Detection of Lumbar Vertebrae in CT Spine Images." In Recent Advances in Computational Methods and Clinical Applications for Spine Imaging, 73–84. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-14148-0_7.

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Kavitha, A., G. Sudhir, T. S. Ranjani., V. Sarah Rajitha Thilagam, and S. Vinutha. "Implant Analysis on the Lumbar-Sacrum Vertebrae Using Finite Element Method." In Advances in 3D Printing & Additive Manufacturing Technologies, 139–54. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-0812-2_13.

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S. I., Raj Arjun, Parth Goplani, Pavan Suswaram, and C. V. Chandrashekara. "Finite Element Modelling of the Human Lumbar Vertebrae for Dynamic Analysis." In Lecture Notes in Mechanical Engineering, 865–70. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-0550-5_79.

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Conference papers on the topic "Lumbar vertebrae"

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Chu, Bryant, Jeremi Leasure, and Dimitriy Kondrashov. "Selective Densitometry of the Lumbar Spine." In ASME 2013 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/sbc2013-14218.

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Bone mineral density (BMD) has been identified as a major factor in spine construct strength, with failures resulting in pedicle screw loosening and pullout2. Computed tomography (CT) scans have been shown to effectively measure BMD1,4. Previous research has utilized this linear correlation of CT Hounsfield Units (HU) to BMD in order to determine BMD as a function of anatomic location within cervical vertebrae1; however, the lumbar spine has not yet been reported on. The goal of this study was to describe BMD of anatomical regions within lumbar vertebrae using the correlation between HU and BMD. It was hypothesized that posterior elements of the spine would exhibit significantly different BMD than the vertebral body. This was tested through means comparison of BMD for each anatomical region.

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Stemper, Brian D., Narayan Yoganandan, Jamie L. Baisden, Frank A. Pintar, and Barry S. Shender. "Rate-Dependent Failure Characteristics of Thoraco-Lumbar Vertebrae: Application to the Military Environment." In ASME 2012 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/sbc2012-80139.

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Quantification of lumbar spine vertebral body tolerance to axial compressive loads is important to understand the biomechanics of injury and for the development of safety enhancements. While fracture tolerance for isolated lumbar vertebral bodies has been outlined in multiple experimental studies, compressive rates were generally in the quasi-static range (e.g., 5 mm/min) [1–4]. However, vertebral body fractures most commonly occur under dynamic mechanisms such as falls from height. In the military environment, lumbar fractures were demonstrated following aviator ejection, helicopter crashes, and underbody blast events involving improvised explosive devices. Vertebral body compression during those events is likely to be orders of magnitude greater than quasi-static rates used previously [5]. Due to the loading rate dependence demonstrated for other tissues, including thoracic vertebrae [6], arteries [7], ligaments [8], and isolated spines [9], tolerance limits obtained from quasi-static testing are not likely applicable for the dynamic loading environment. Therefore, this study was conducted to quantify dynamic fracture biomechanics of lumbar vertebrae.

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Dickerson, Clark R., Subrata Saha, and Charlotte Hotchkiss. "QCT Cortical Shell Thickness as a Predictor of Vertebral Body Strength for Cynomolgus Monkeys." In ASME 1999 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/imece1999-0437.

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Abstract Many studies have investigated the ability of vertebral trabecular BMC measurements to predict overall vertebral strength. Far fewer investigations, however, have examined the use of cortical shell data to predict maximum strength. In this study, we are investigating the load-carrying characteristics of the cortical region of vertebral bodies Lumbar vertebrae from macaca fascicularis were examined by QCT and mechanically tested in compression. Our results show that cortical thickness, as determined by QCT, is a significant predictor of vertebral maximum stress (R = 0.62, p < 1 E−5). This relationship is improved when the cortical thickness is compared to load (R = 0.77, p < 5 E−10). This information reveals that the cortical shell plays a major role in determining the load carrying capacity of lumbar vertebrae, and that examination of cortical thickness will give an approximation of maximum vertebral stress and load.

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Karadogan, Ernur, and Robert L. Williams. "Dynamics and Control of the Robotic Lumbar Spine (RLS)." In ASME 2012 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/detc2012-70293.

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This paper presents the dynamics and nonlinear control of the Robotic Lumbar Spine (RLS). The RLS is a 15 degree-of-freedom, fully cable-actuated robotic lumbar spine which can mimic in vivo human lumbar spine movements to provide better hands-on training for medical students. The current design includes five active lumbar vertebrae and the sacrum, with dimensions of an average adult human spine. It is actuated by 20 cables connected to electric motors. Every vertebra is connected to the neighboring vertebrae by spherical joints. Medical schools can benefit from a tool, system, or method that will help instructors train students and assess their tactile proficiency throughout their education. The robotic lumbar spine has the potential to satisfy these needs in palpatory diagnosis. Additionally, a new approach to solve for positive and nonzero cable tensions that are also continuous in time is introduced.

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Bisseling, Johannes T., Leon J. T. O. van Erning, Theo E. Schouten, and J. Albert M. Lemmen. "Automatic CT Measurement In Lumbar Vertebrae." In Biostereometrics '88: Fifth Intl Mtg, edited by Juerg U. Baumann and Robin E. Herron. SPIE, 1989. http://dx.doi.org/10.1117/12.950464.

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Unnikrishnan, Ginu U., Glenn D. Barest, David B. Berry, Amira I. Hussein, and Elise F. Morgan. "Influence of Specimen-Specific Trabecular Anisotropy on QCT-Based Finite Element Analyses of Lumbar Vertebra." In ASME 2012 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/sbc2012-80114.

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Quantitative computed tomography (QCT)-based finite element (FE) models provide better predictions of vertebral strength compared to traditional methods currently used in clinical diagnosis [1]. In QCT-based FE models, the intra- and inter-specimen variations in trabecular anisotropy are often ignored, despite evidence that the biomechanical behavior of the vertebra depends on the architecture of the vertebral trabecular bone [2]. A realistic representation of the specimen-specific, trabecular anisotropy in the FE models of vertebrae would potentially improve predictions of vertebral failure. The overall goal of this study was to evaluate the importance of incorporating specimen-specific, trabecular anisotropy for QCT-based FE predictions of vertebral stiffness and deformation patterns. The major aims of this study were (a) to compare the QCT-based FE results obtained with a constant, anisotropic, material model (the “generic-anisotropic” model) for trabecular bone to those obtained with a specimen-specific, anisotropic, material model and (b) to study the influence of degree of anisotropy (DA) on the FE predictions of vertebral stiffness.

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Shirazi-Adl, A., and M. Parnianpour. "How Is the Lumbar Spine Stabilized in Compression? Model Studies on Effect of Various Loading Configurations." In ASME 1998 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/imece1998-0089.

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Abstract The passive human lumbar spine exhibits instability (ie, hypermobility) under compression loads of less than 100N [1,2] which is only a small fraction of loads experienced during various recreational/occupational daily activities. The issue of the spinal stability under compression loads has been the focus of a number of studies [3–7]. The observation of changes in the posture (ie, pelvic tilt, lordosis) during loading/micro-gravity and in low-back population along with that of negligible muscle activities in erect postures with/without loads in hands suggest that the spinal posture is so adjusted as to stabilise the passive system with minimal muscle activation. In search of such plausible mechanisms, this work investigates the effect of alterations in load configurations and lumbar lordosis on the equilibrium/stability of the lumbar spine in moderate/large axial loads. Using a detailed nonlinear finite element model of the lumbar spine, the influence of sagittal/lateral moments on the equilibrium response in axial compression up to 2800N applied at the @L1 alone or distributed among lumbar vertebrae is studied for different lumbar curvatures. The effects of the application of the compression as a follower load on the L1 alone or L1-L5 vertebrae and a novel wrapping compression load that passes through the vertebral centres on the equilibrium/stability response is subsequently investigated using a simplified nonlinear beam model of the lumbar spine.

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Ranu, Harcharan Singh, and Aman Sweet Bhullar. "Simulation of Stress-Fracture in Human Vertebral Body due to Extreme Weight Lifting." In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-63080.

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Lumbar vertebrae are a heavily loaded component of human body. They are subjected to repetitive loading in daily activities. However, limited information on failure mechanism of lumbar vertebrae are available to date. Thus, the need to develop an analytical model to predict stress-fracture characteristics of vertebral body. A linear elastic fracture mechanics approach has been considered and a mathematical model has been proposed so that the predictions can be made more easily related to the occurrence of injury. Study reveals that for a person weighing 1334 N and lifting a weight of 345 kg during squat exercise causes a vertebral stress-fracture at 12 repetitive standing lifting. While same load at lowest position yields a stress-fracture at less than 3 lifting. Numerical study shows that for change of position from standing to lowest position resultant compressive force acting on spine increases by two times whereas the possibility of stress-fracture increases by five times. Similarly at dead lift exercise, lifting 325 kg from standing to lowest position increases resultant compressive forces on vertebrae by 2.5 times. However, stress-fracture ratio increases by six times. Study reveals that for a person weighing 800 N (height = 1.8 m) and lifting a weight of 900 N, vertebrae can be subjected to stress-fracture by three cyclic lifting. Rate of injury is dependent on flexion angle i.e. as flexion angle increases, so does rate of injury.

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Uppala, Subramanya, Robert X. Gao, Scott Cowan, and K. Francis Lee. "A Biomechanical Model of Lumbar Spine." In ASME 2000 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/imece2000-2282.

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Abstract The strength and stability of the lumbar spine are determined not only by the bone and muscles, but also by the visco-elastic structures and the interplay between the different components of the spine, such as ligaments, capsules, annulus fibrosis, and articular cartilage. In this paper we present a non-linear three-dimensional Finite Element model of the lumbar spine. Specifically, a three-dimensional FE model of the L4-5 one-motion segment/2 vertebrae was developed. The cortical shell and the cancellous bone of the vertebral body were modeled as 3D isoparametric eight-nodal elements. Finite element models of spinal injuries with fixation devices are also developed. The deformations across the different sections of the spine are observed under the application of axial compression, flexion/extension, and lateral bending. The developed FE models provided input to both the fixture design and experimental studies.

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Pfeiffer, Ferris M., Theodore J. Choma, Santaram Vallurupalli, and Irene H. Mannering. "Segmental Stiffness Achieved by Three Types of Instrumented Fixation for Unstable Lumbar Spondylolytic Motion Segments." In ASME 2009 4th Frontiers in Biomedical Devices Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/biomed2009-83015.

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Spondylolysis is a defect in the vertebral pars interarticularis. Its cause may be developmental or due to mechanical etiologies such as trauma. Most childhood and adolescent spondylolisthesis (defined as a slip of one vertebrae relative to another) is associated with spondylolysis of the pars interarticularis at the L5–S1 motion segment.

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Reports on the topic "Lumbar vertebrae"

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Li, Wenhao, Yiqun Niu, Ziye Qiu, Shibo Zhou, Wenqing Zhong, Zhencheng Xiong, Dingyan Zhao, Yongdong Yang, He Zhao, and Xing Yu. Can vertebral osteoporosis accelerate lumbar disc degeneration? A systematic review and meta-analysis from animal studies. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, July 2023. http://dx.doi.org/10.37766/inplasy2023.7.0099.

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