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  1. Article ; Online: Reply to comment on Andrei et al.: The variability of vertebral body volume and pain associated with osteoporotic vertebral fractures: conservative treatment versus percutaneous transpedicular vertebroplasty.

    Popa, Iulian

    International orthopaedics

    2018  Volume 42, Issue 4, Page(s) 971–972

    MeSH term(s) Conservative Treatment ; Humans ; Osteoporotic Fractures ; Pain ; Spinal Fractures ; Vertebroplasty
    Language English
    Publishing date 2018-02-07
    Publishing country Germany
    Document type Letter ; Comment
    ZDB-ID 80384-4
    ISSN 1432-5195 ; 0341-2695
    ISSN (online) 1432-5195
    ISSN 0341-2695
    DOI 10.1007/s00264-017-3749-y
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    Zs.A 1324: Show issues Location:
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  2. Article ; Online: Cohort study on the relationship between morphologic parameters of paravertebral muscles, BMI and lumbar lordosis on the severity of lumbar stenosis.

    Caprariu, Radu / Oprea, Manuel / Popa, Iulian / Andrei, Diana / Birsasteanu, Florin / Poenaru, V Dan

    European journal of orthopaedic surgery & traumatology : orthopedie traumatologie

    2022  Volume 33, Issue 6, Page(s) 2435–2443

    Abstract: Introduction: There is a growing body of literature separately linking lumbar spinal stenosis (LSS) with various factors such as paravertebral muscle (PVM) impaired function/morphology, lordosis or BMI. However, their interplay is yet to be known. The ... ...

    Abstract Introduction: There is a growing body of literature separately linking lumbar spinal stenosis (LSS) with various factors such as paravertebral muscle (PVM) impaired function/morphology, lordosis or BMI. However, their interplay is yet to be known. The present study aims to investigate the relationship between PVM morphology, BMI and lumbar lordosis in a population with a surgical indication for LSS.
    Materials and methods: A cross-sectional retrospective study was conducted on a group of 122 patients diagnosed with LSS in a hospital setting and scheduled for spine surgery. Epidemiological data and body mass index (BMI) were gathered. The cross-sectional area of the psoas muscle (rCSA) at the L4-L5 disc level on preoperative axial T2 MRI was measured. Fat infiltration of the anterior (APVM) and posterior paravertebral muscles (PPVM) was evaluated according to Goutallier classification while the severity of lumbar stenosis was staged according to Schizas criteria. Lumbar lordosis was measured on sagittal MRI using Cobb's angle method. The presence of the "rising psoas" sign was also noted. Statistical analysis of the data was performed using Pearson and Spearman correlations.
    Results: Statistical analysis revealed a moderate correlation between the severity of LSS and BMI (p = 0.001), and fatty infiltration of paravertebral muscles (p = 0.000, p = 0.000). Adjusting for age, gender, and BMI resulted in a low correlation (p = 0.003, p = 0.045), rCSA correlated negatively with age, gender, and lordosis. BMI had a low positive correlation with lumbar lordosis (p = 0.006), severity (p = 0.001), number of levels (p = 0.005) and PPVM (p = 0.031).
    Conclusions: This study highlighted the relationship between PVM morphology and the severity of radiological signs in patients with LSS undergoing spine surgery and found a correlation independent of age, gender, and BMI. BMI was also shown to correlate with the severity after controlling for age and gender. rCSA has limited use in evaluating the severity of LSS.
    MeSH term(s) Humans ; Constriction, Pathologic ; Lordosis/diagnostic imaging ; Retrospective Studies ; Body Mass Index ; Cohort Studies ; Magnetic Resonance Imaging ; Spinal Stenosis/diagnostic imaging ; Spinal Stenosis/surgery ; Psoas Muscles/diagnostic imaging ; Lumbar Vertebrae/diagnostic imaging ; Lumbar Vertebrae/surgery ; Paraspinal Muscles
    Language English
    Publishing date 2022-12-19
    Publishing country France
    Document type Journal Article
    ZDB-ID 1231084-0
    ISSN 1432-1068 ; 1633-8065 ; 0948-4817 ; 0940-3264
    ISSN (online) 1432-1068
    ISSN 1633-8065 ; 0948-4817 ; 0940-3264
    DOI 10.1007/s00590-022-03435-4
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  3. Article ; Online: Reduction of spondylolisthesis and sagittal balance correction by anterior lumbar interbody fusion (ALIF).

    Caprariu, Radu / Popa, Iulian / Oprea, Manuel / Niculescu, Marius / Poenaru, Dan / Birsasteanu, Florin

    International orthopaedics

    2021  Volume 45, Issue 4, Page(s) 997–1001

    Abstract: Purpose: Long time recognized as a cause of lumbar stenosis, degenerative spondylolisthesis has an evolution in interrelation with sagittal balance. This study aimed to assess the role of ALIF in correcting the sagittal balance in patients with ... ...

    Abstract Purpose: Long time recognized as a cause of lumbar stenosis, degenerative spondylolisthesis has an evolution in interrelation with sagittal balance. This study aimed to assess the role of ALIF in correcting the sagittal balance in patients with degenerative spondylolisthesis.
    Material and methods: Twenty patients aged between 47 and 70 years were operated between July 2011 and September 2014 for degenerative spondylolisthesis by ALIF. The pre-operative and post-operative valid standing full spine radiographs were reviewed retrospectively. Clinical and radiological evaluations were conducted pre-operatively and postoperatively at one year and five years.
    Results: Lumbar lordosis (LL) was measured to 41.16 ± 14.25° pre-operatively and 47.27 ± 11.25° post-operatively (p > 0.05). At one year was 49.76 ± 13.31° and at five years 46.93 ± 9.26° (p > 0.05). Mean gain of lordosis after ALIF at index level was calculated to 8 ± 1.6° [4-12°].
    Conclusions: ALIF offers a good reduction of the slipped vertebra providing good conditions for fusion and is an efficient surgical technique to recreate the sagittal spine balance.
    MeSH term(s) Aged ; Humans ; Lumbar Vertebrae/diagnostic imaging ; Lumbar Vertebrae/surgery ; Lumbosacral Region ; Middle Aged ; Retrospective Studies ; Spinal Fusion/adverse effects ; Spondylolisthesis/diagnostic imaging ; Spondylolisthesis/surgery
    Language English
    Publishing date 2021-01-04
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 80384-4
    ISSN 1432-5195 ; 0341-2695
    ISSN (online) 1432-5195
    ISSN 0341-2695
    DOI 10.1007/s00264-020-04900-7
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
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  4. Book ; Online ; Thesis: Pulsed magnetic resonance on single defect centers in diamond

    Popa, Iulian

    2007  

    Author's details vorgelegt von: Iulian Popa
    Language English
    Size Online-Ressource (PDF-Datei: 134 S., 1 038 KB)
    Publisher Univ
    Publishing place Stuttgart
    Document type Book ; Online ; Thesis
    Thesis / German Habilitation thesis Univ., Diss.--Stuttgart, 2006
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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  5. Book ; Online ; Thesis: Pulsed magnetic resonance on single defect centers in diamond

    Popa, Iulian

    2007  

    Author's details vorgelegt von: Iulian Popa
    Language English
    Size Online-Ressource (PDF-Datei: 134 S., 1 038 KB)
    Publisher Univ
    Publishing place Stuttgart
    Document type Book ; Online ; Thesis
    Thesis / German Habilitation thesis Univ., Diss.--Stuttgart, 2006
    Database Former special subject collection: coastal and deep sea fishing

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  6. Book ; Online: România şi Piaţa Unică Digitală a Uniunii Europene

    Gaftea, Viorel-Nicolae / Ioniță, Angela / Nițu, Ionel / Popa, Iulian-Florentin

    oportunităţi şi provocări

    (Studii de strategie şi politici, SPOS ; 2017, studiul nr. 3)

    2018  

    Author's details autori: Viorel-Nicolae Gaftea (coordonator), Angela Ioniță, Ionel Nițu, Iulian-Florentin Popa
    Series title Studii de strategie şi politici, SPOS ; 2017, studiul nr. 3
    Keywords E-Business ; Computerunterstützung ; EU-Binnenmarkt ; EU-Staaten ; Rumänien
    Language Romanian
    Size 1 Online-Ressource (circa 90 Seiten), Illustrationen
    Document type Book ; Online
    Note Zusammenfassung in rumänischer und englischer Sprache
    ISBN 9786068202594 ; 6068202593
    Database ECONomics Information System

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  7. Article: Salt dissolution potential estimated from two-dimensional vertical thermohaline flow and transport modeling along a Transylvanian salt diapir, Romania

    Zechner, Eric / Dresmann, Horst / Mocuţa, Marius / Danchiv, Alex / Huggenberger, Peter / Scheidler, Stefan / Wiesmeier, Stefan / Popa, Iulian / Zlibut, Alexandru

    Hydrogeology journal. 2019 June, v. 27, no. 4

    2019  

    Abstract: The presented study explores the salt dissolution potential of fluids around a salt diapir in the Transylvanian town of Ocna Mures, Romania, which is facing land-collapse hazards related to salt mining activities. A structural three-dimensional (3D) ... ...

    Title translation Potentiel de dissolution du sel estimé à partir d’un modèle bidimensionnel d’écoulement thermohalin vertical et de transport le long d’un diapir de sel transylvanien, Roumanie Potencial de disolución de la sal estimado a partir de la circulación bidimensional de una termohalina vertical y modelos de transporte a lo largo de un diapiro de sal de Transilvania, Rumania 从罗马尼亚沿特兰西瓦尼亚盐挤入构造二维垂直温盐水流和传输模拟中估算盐分溶解的潜力 Potencial de dissolução de sal estimado a partir do fluxo termohalino vertical bidimensional e de modelagem de transporte ao longo de um diapiro salino na Transilvânia, Romênia Potențialul de dizolvare a sării estimat din modelarea 2D verticală a curgerii termohaline și a transportului în zona unui diapir de sare dinTransilvania, România
    Abstract The presented study explores the salt dissolution potential of fluids around a salt diapir in the Transylvanian town of Ocna Mures, Romania, which is facing land-collapse hazards related to salt mining activities. A structural three-dimensional (3D) model of the salt diapir, the adjacent basin sediments, and the mining galleries was developed based on existing maps, borehole data, own field observations, and geological publications of the Transylvanian Basin. The salt dissolution potential was estimated from 2D vertical thermohaline flow and transport model scenarios along the southeastern flank of the diapir. Results showed that the following factors increase the salt dissolution capacity along the upper 180 m of the diapir: (1) the presence of more permeable Quaternary alluvial sediments in connection with a fault zone of higher permeability along the diapir, and (2) the presence of more permeable sandstone units within the Miocene sediments in the east of the diapir, which provide freshwater access to the upper parts of the diapir. Thermohaline simulation with viscosity variation of the fluid, instead of a constant viscosity, influences the resulting salt fluxes by up to 50% within studied temperature ranges of 10–60 °C in the model domain. The range of theoretical dissolution rates along the upper 180 m of the diapir supports the hypothesis that cavern collapse is more likely to occur where cavern side walls have already been mined to almost no remaining side walls of rock salt, which is the case in the southeastern part of the diapir.
    Keywords Miocene epoch ; basins ; caves ; freshwater ; hydrogeology ; mining ; models ; permeability ; sandstone ; sediments ; temperature ; viscosity ; Romania
    Language English
    Dates of publication 2019-06
    Size p. 1245-1256.
    Publishing place Springer Berlin Heidelberg
    Document type Article
    ZDB-ID 1227482-3
    ISSN 0941-2816 ; 1431-2174
    ISSN 0941-2816 ; 1431-2174
    DOI 10.1007/s10040-018-1912-1
    Database NAL-Catalogue (AGRICOLA)

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    In stock of ZB MED Bonn / Germany

    ((Einzelsign.)): Show issues

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  8. Book ; Thesis: Pulsed magnetic resonance on single defect centers in diamond

    Popa, Iulian

    2006  

    Author's details Iulian Popa
    Language English
    Size III, 129 S., graph. Darst.
    Document type Book ; Thesis
    Thesis / German Habilitation thesis Univ., Diss.--Stuttgart, 2006
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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  9. Article ; Online: Post-deposition opal evolution.

    Popa, Iulian / Marlow, Frank

    Chemphyschem : a European journal of chemical physics and physical chemistry

    2008  Volume 9, Issue 11, Page(s) 1541–1547

    Abstract: The formation of artificial opal films consists of wet opal deposition, drying, and possible transformations in the dry state. The processes after deposition, before the crystals lattice reaches its final equilibrium state, are studied herein. We follow ... ...

    Abstract The formation of artificial opal films consists of wet opal deposition, drying, and possible transformations in the dry state. The processes after deposition, before the crystals lattice reaches its final equilibrium state, are studied herein. We follow the time evolution of the optical transmission spectra for polystyrene opals with different thicknesses. The evolution of the spectra shows pronounced changes in the Bragg peak position, width and height, as well as changes in the background and, in the beginning of the process, a band related to residual water in the sample. Therefore, a wet and a dry phase can be distinguished in the opal transformations. They are all connected to shrinkage and we associate one of them with a possible new sintering mechanism.
    Language English
    Publishing date 2008-08-04
    Publishing country Germany
    Document type Journal Article
    ISSN 1439-7641
    ISSN (online) 1439-7641
    DOI 10.1002/cphc.200800159
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article: Sagittal balance parameters correlate with spinal conformational type and MRI changes in lumbar degenerative disc disease: results of a retrospective study.

    Mardare, Mihai / Oprea, Manuel / Popa, Iulian / Zazgyva, Ancuța / Niculescu, Marius / Poenaru, Dan V

    European journal of orthopaedic surgery & traumatology : orthopedie traumatologie

    2016  Volume 26, Issue 7, Page(s) 735–743

    Abstract: Purpose: Spinopelvic parameters can be useful in identifying risk factors for lumbar degenerative disc disease, but few studies assess patients with single-level disc herniation and most do not evaluate symptoms. This comparative retrospective study was ...

    Abstract Purpose: Spinopelvic parameters can be useful in identifying risk factors for lumbar degenerative disc disease, but few studies assess patients with single-level disc herniation and most do not evaluate symptoms. This comparative retrospective study was aimed to analyse spinopelvic parameters, symptoms and MRI changes in patients with single-level lumbar disc herniation undergoing conservative or surgical treatment.
    Methods: Patients with clinical and radiological assessment (Japanese Orthopaedic Association Score) and an MRI evaluation of the lumbar spine were identified and divided into two groups: surgically treated (group A) and not requiring surgery (group B). Spinopelvic parameters were determined on standing profile radiographs of the lumbar spine and pelvis, and mean values were compared to those reported in the literature for normal subjects. MRI findings were graded according to the system described by Pfirrmann et al.
    Results: The study included 71 patients with single-level lumbar disc herniation: 26 in group A (39.4 ± 12.1 years) and 45 in group B (51.4 ± 17.2 years). The notable differences in spinopelvic parameter means between the two groups did not reach statistical significance. A positive correlations of age with pelvic tilt and Pfirrmann changes with pelvic incidence was only found in group A, while both groups showed highly significant positive correlations of pelvic incidence with the spine's conformational type (p = 0.001).
    Conclusions: Characteristic changes in spinopelvic parameters identified in patients with lumbar degenerative disc disease were a reduction in pelvic incidence, sacral slope and lumbar lordosis, with an increased pelvic tilt. These were found to correlate with MRI changes in surgically treated patients.
    MeSH term(s) Adult ; Female ; Humans ; Intervertebral Disc Degeneration/pathology ; Intervertebral Disc Degeneration/physiopathology ; Intervertebral Disc Displacement/pathology ; Intervertebral Disc Displacement/physiopathology ; Kyphosis/pathology ; Kyphosis/physiopathology ; Lumbar Vertebrae/pathology ; Magnetic Resonance Imaging ; Male ; Middle Aged ; Postural Balance/physiology ; Radiography ; Retrospective Studies
    Language English
    Publishing date 2016-10
    Publishing country France
    Document type Journal Article ; Observational Study
    ZDB-ID 1231084-0
    ISSN 1432-1068 ; 1633-8065 ; 0948-4817 ; 0940-3264
    ISSN (online) 1432-1068
    ISSN 1633-8065 ; 0948-4817 ; 0940-3264
    DOI 10.1007/s00590-016-1842-3
    Database MEDical Literature Analysis and Retrieval System OnLINE

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