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  • 1
    Online-Ressource
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    Stenotic intercondylar notch is not a risk factor for posterior cruciate ligament rupture: a morphological analyses using magnetic resonance imaging
    Springer Science and Business Media LLC ; 2022
    In:  Knee Surgery, Sports Traumatology, Arthroscopy Vol. 30, No. 5 ( 2022-05), p. 1711-1717
    Details
    In: Knee Surgery, Sports Traumatology, Arthroscopy, Springer Science and Business Media LLC, Vol. 30, No. 5 ( 2022-05), p. 1711-1717
    Kurzfassung: The present study aimed to examine the factors related to the morphological characteristics of the femoral condyle in posterior cruciate ligament rupture in female and male populations. Methods One hundred and three patients (41 females, 62 males) with posterior cruciate ligament rupture from 2010 to 2020 were included in this retrospective case–control study. The sex and age of the posterior cruciate ligament rupture group were matched to those of the control group (41 females, 62 males; age range 16–69 years). Magnetic resonance imaging was used to measure the intercondylar notch width, femoral condylar width, and intercondylar notch angle in both the axial and coronal images. The ‘α’ angle was also measured using magnetic resonance imaging. The notch width index is the ratio of the intercondylar notch width to the femoral condylar width. Three types of intercondylar notch shapes (types A, U, and W) were evaluated in the axial magnetic resonance imaging images. Results The difference in the mean coronal notch width index between the study groups was statistically significant in the female population. The difference in the mean coronal femoral condylar width between the study groups was statistically significant in the male population. Conclusions A larger coronal notch width index was the greatest risk factor for posterior cruciate ligament rupture in the female population. In the male population, decreased coronal condylar width was the greatest risk factor for posterior cruciate ligament rupture. The results did not indicate that patients with a PCL rupture have a stenotic intercondylar notch. Posterior cruciate ligament injury prevention strategies could be applied to females with a larger coronal notch width index and males with a decreased condylar width. Levels of evidence Level III.
    Materialart: Online-Ressource
    ISSN: 0942-2056 , 1433-7347
    URL: Article
    DOI: 10.1007/s00167-021-06724-3
    Sprache: Englisch
    Verlag: Springer Science and Business Media LLC
    Publikationsdatum: 2022
    ZDB Id: 1473170-8
    SSG: 31
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  • 2
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    Treatment of Unstable Posterior Pelvic Ring Injury with S2-Alar-Iliac Screw and S1 Pedicle Screw Fixation
    Elsevier BV ; 2022
    In:  World Neurosurgery Vol. 158 ( 2022-02), p. e1002-e1010
    Details
    In: World Neurosurgery, Elsevier BV, Vol. 158 ( 2022-02), p. e1002-e1010
    Materialart: Online-Ressource
    ISSN: 1878-8750
    URL: Article
    DOI: 10.1016/j.wneu.2021.12.016
    Sprache: Englisch
    Verlag: Elsevier BV
    Publikationsdatum: 2022
    ZDB Id: 2530041-6
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  • 3
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    Can barb thread design improve the pullout strength of bone screws? : a biomechanical study and finite element explanation
    British Editorial Society of Bone & Joint Surgery ; 2021
    In:  Bone & Joint Research Vol. 10, No. 2 ( 2021-02-01), p. 105-112
    Details
    In: Bone & Joint Research, British Editorial Society of Bone & Joint Surgery, Vol. 10, No. 2 ( 2021-02-01), p. 105-112
    Kurzfassung: To draw a comparison of the pullout strengths of buttress thread, barb thread, and reverse buttress thread bone screws. Methods Buttress thread, barb thread, and reverse buttress thread bone screws were inserted into synthetic cancellous bone blocks. Five screw-block constructs per group were tested to failure in an axial pullout test. The pullout strengths were calculated and compared. A finite element analysis (FEA) was performed to explore the underlying failure mechanisms. FEA models of the three different screw-bone constructs were developed. A pullout force of 250 N was applied to the screw head with a fixed bone model. The compressive and tensile strain contours of the midsagittal plane of the three bone models were plotted and compared. Results The barb thread demonstrated the lowest pullout strength (mean 176.16 N (SD 3.10)) among the three thread types. It formed a considerably larger region with high tensile strains and a slightly smaller region with high compressive strains within the surrounding bone structure. The reverse buttress thread demonstrated the highest pullout strength (mean 254.69 N (SD 4.15)) among the three types of thread. It formed a considerably larger region with high compressive strains and a slightly smaller region with high tensile strains within the surrounding bone structure. Conclusion Bone screws with a reverse buttress thread design will significantly increase the pullout strength. Cite this article: Bone Joint Res 2021;10(2):105–112.
    Materialart: Online-Ressource
    ISSN: 2046-3758
    URL: Article
    DOI: 10.1302/2046-3758.102.BJR-2020-0072.R2
    Sprache: Englisch
    Verlag: British Editorial Society of Bone & Joint Surgery
    Publikationsdatum: 2021
    ZDB Id: 2669244-2
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  • 4
    Online-Ressource
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    S2-alar-iliac screw and S1 pedicle screw fixation for the treatment of non-osteoporotic sacral fractures: a finite element study
    Springer Science and Business Media LLC ; 2021
    In:  Journal of Orthopaedic Surgery and Research Vol. 16, No. 1 ( 2021-12)
    Details
    In: Journal of Orthopaedic Surgery and Research, Springer Science and Business Media LLC, Vol. 16, No. 1 ( 2021-12)
    Kurzfassung: Five different sacral fracture fixation methods were compared using finite element (FE) analysis to study their biomechanical characteristics. Methods Denis type I sacral fractures were created by FE modeling. Five different fixation methods for the posterior pelvic ring were simulated: sacroiliac screw (SIS), lumbopelvic fixation (LPF), transiliac internal fixator (TIFI), S2-alar-iliac (S2AI) screw and S1 pedicle screw fixation (S2AI-S1) and S2AI screw and contralateral S1 pedicle screw fixation (S2AI-CS1). Four different loading methods were implemented in sequence to simulate the force in standing, flexion, right bending and left twisting, respectively. Vertical stiffness, relative displacement and change in relative displacement were recorded and analyzed. Results As predicted by the FE model, the vertical stiffness of the five groups in descending order was S2AI-S1, SIS, S2AI-CS1, LPF and TIFI. In terms of relative displacement, groups S2AI-S1 and S2AI-CS1 displayed a lower mean relative displacement, although group S2AI-CS1 exhibited greater displacement in the upper sacrum than group S2AI-S1. Group SIS displayed a moderate mean relative displacement, although the displacement of the upper sacrum was smaller than the corresponding displacement in group S2AI-CS1, while groups LPF and TIFI displayed larger mean relative displacements. Finally, in terms of change in relative displacement, groups TIFI and LPF displayed the greatest fluctuations in their motion, while groups SIS, S2AI-S1 and S2AI-CS1 displayed smaller fluctuations. Conclusion Compared with SIS, unilateral LPF and TIFI, group S2AI-S1 displayed the greatest biomechanical stability of the Denis type I sacral fracture FE models. When the S1 pedicle screw insertion point on the affected side is damaged, S2AI-CS1 can be used as an appropriate alternative to S2AI-S1.
    Materialart: Online-Ressource
    ISSN: 1749-799X
    URL: Article
    DOI: 10.1186/s13018-021-02805-8
    Sprache: Englisch
    Verlag: Springer Science and Business Media LLC
    Publikationsdatum: 2021
    ZDB Id: 2252548-8
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  • 5
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    How to obtain and identify the acetabular anterior column axial view projection in patients?
    SAGE Publications ; 2017
    In:  Journal of Orthopaedic Surgery Vol. 25, No. 1 ( 2017-01-01), p. 230949901668501-
    Details
    In: Journal of Orthopaedic Surgery, SAGE Publications, Vol. 25, No. 1 ( 2017-01-01), p. 230949901668501-
    Kurzfassung: This study aims at sharing our experience as how to obtain and identify axial view image of the acetabular anterior column in patients. Methods: Pelvic computed tomography data of six normal adults were used to reconstruct three-dimensional (3D) models. The transparency of each 3D model was downgraded at the view perpendicular to the cross section of the anterior column axis to simulate the anterior column axial view image. Fluoroscopy was performed in all patients to obtain the anterior column axial view image in the operating room. Each fluoroscopic image was compared with the corresponding simulation image to analyze potential anatomic landmarks that were helpful to identify the translucent area (projection of the screw path) in the patients. Results and Conclusions: To obtain ideal anterior column axial fluoroscopic image, the patient should be positioned supine with the leg of “abnormal side” straight and contralateral side flexion, abduction, and external rotation; the C-arm machine should be placed at the caudal end of the operation table with the C-arm fluoroscopic intensifier first positioned at the pelvic lateral view and then tilted approximately 30° toward the “abnormal side” and rotated approximately 45° toward the caudal end of the operation table. To identify the translucent area on the anterior column axial view fluoroscopic image obtained from the patient, the greater sciatic notch, the true pelvis edge, and the acetabulum should be identified first and the translucent area is located in the area surrounded by these three anatomic landmarks.
    Materialart: Online-Ressource
    ISSN: 2309-4990 , 2309-4990
    URL: Article
    DOI: 10.1177/2309499016685012
    Sprache: Englisch
    Verlag: SAGE Publications
    Publikationsdatum: 2017
    ZDB Id: 2128854-9
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  • 6
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    Bone resorption triggered by high radial stress: The mechanism of screw loosening in plate fixation of long bone fractures
    Wiley ; 2019
    In:  Journal of Orthopaedic Research Vol. 37, No. 7 ( 2019-07), p. 1498-1507
    Details
    In: Journal of Orthopaedic Research, Wiley, Vol. 37, No. 7 ( 2019-07), p. 1498-1507
    Kurzfassung: Screw loosening is a common complication in plate fixation. However, the underlying mechanism is unclear. This study investigated screw loosening mechanisms by finite element analysis (FEA) simulation and clinical X‐ray feature analysis. Two FEA models incorporated bone heterogeneity and orthotropy, representing fracture fixation using dynamic compression plate (DCP) and locking compression plate (LCP), were developed. These models were used to examine the volume of bone exceeding a certain stress value around each screw under physiologically‐relevant loading conditions. These damaged bone was then separated and compared by the axial stress and radial stress of each screw. In addition, features of patients’ X‐ray images showing screw loosening were analyzed to validate the loosening features simulated by the models. The FEA study showed that more damaged bone was found at the central two screws which gradually decreased toward the two end screws in all groups. More bone was damaged by the radial stress of each screw than by the axial stress. The radiological analysis of screw loosening showed that bone loss occurred at the screw closest to the fracture line first then subsequent bone loss at the screws further away from the fracture line occurred. This study found that the two screws nearest to the fracture line are more vulnerable to loosening. The radial stress of the screw plays a larger role in screw loosening than the axial stress. Bone resorption triggered by the high radial stress of screws is indicated as the mechanism of screw loosening in the diaphyseal plate fixation. © 2019 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 37:1498–1507, 2019.
    Materialart: Online-Ressource
    ISSN: 0736-0266 , 1554-527X
    URL: Issue
    URL: Article
    DOI: 10.1002/jorr.v37.7
    DOI: 10.1002/jor.24286
    Sprache: Englisch
    Verlag: Wiley
    Publikationsdatum: 2019
    ZDB Id: 2050452-4
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  • 7
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    Human gait recognition by fusing global and local image entropy features with neural networks
    SPIE-Intl Soc Optical Eng ; 2022
    In:  Journal of Electronic Imaging Vol. 31, No. 01 ( 2022-2-25)
    Details
    In: Journal of Electronic Imaging, SPIE-Intl Soc Optical Eng, Vol. 31, No. 01 ( 2022-2-25)
    Materialart: Online-Ressource
    ISSN: 1017-9909
    URL: Article
    DOI: 10.1117/1.JEI.31.1.013034
    Sprache: Unbekannt
    Verlag: SPIE-Intl Soc Optical Eng
    Publikationsdatum: 2022
    ZDB Id: 2032860-6
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  • 8
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    A novel mechanical parameter to quantify the microarchitecture effect on apparent modulus of trabecular bone: A computational analysis of ineffective bone mass
    Elsevier BV ; 2020
    In:  Bone Vol. 135 ( 2020-06), p. 115314-
    Details
    In: Bone, Elsevier BV, Vol. 135 ( 2020-06), p. 115314-
    Materialart: Online-Ressource
    ISSN: 8756-3282
    URL: Article
    DOI: 10.1016/j.bone.2020.115314
    Sprache: Englisch
    Verlag: Elsevier BV
    Publikationsdatum: 2020
    ZDB Id: 1496324-3
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  • 9
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    Recognizing knee pathologies by using gait dynamics via kernel principal component analysis and deterministic learning theory
    Springer Science and Business Media LLC ; 2018
    In:  Journal of Ambient Intelligence and Humanized Computing
    Details
    In: Journal of Ambient Intelligence and Humanized Computing, Springer Science and Business Media LLC
    Materialart: Online-Ressource
    ISSN: 1868-5137 , 1868-5145
    URL: Article
    DOI: 10.1007/s12652-018-0890-4
    Sprache: Englisch
    Verlag: Springer Science and Business Media LLC
    Publikationsdatum: 2018
    ZDB Id: 2543187-0
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  • 10
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    Effect of the screw tightening sequence on the stress distribution of a dynamic compression plate: A pilot finite element study
    SAGE Publications ; 2019
    In:  Journal of Orthopaedic Surgery Vol. 27, No. 3 ( 2019-09-01), p. 230949901987607-
    Details
    In: Journal of Orthopaedic Surgery, SAGE Publications, Vol. 27, No. 3 ( 2019-09-01), p. 230949901987607-
    Kurzfassung: Although the optimal screw tightening sequence is a common question orthopaedists encounter during fractures fixation with a dynamic compression plate (DCP), the effect of the screw tightening sequence on the stability of the plate has never been explored. This study explores the effect of the screw tightening sequence on the stress distribution of a DCP using a finite element method. Methods: Idealized finite element analysis models of the femoral diaphysis with six-hole or eight-hole DCPs were constructed. The screw tightening preload was simulated using ‘bolt load’ in ABAQUS. Two screw tightening sequences were studied for the six-hole plate and six sequences were studied for the eight-hole plate. U magnitude and Von Mises stress were used to evaluate the deformation and stress distribution of the plate, respectively. Deformation and stress distribution plots from different sequences were compared. Results: The different screw tightening sequences showed different deformation processes, while all had the same final deformation after all the screws were tightened. Each screw tightening step of different tightening sequences showed different stress distributions in the plate, while all had the same stress distribution after all the screws were tightened. Conclusion: Using different screw tightening sequences to fix the same DCP can produce the same stability, which means in terms of fixation stability, after the two screws nearest to the fracture line are tightened, surgeons do not need to hesitate about the order in which the rest screws should be inserted during the surgery.
    Materialart: Online-Ressource
    ISSN: 2309-4990 , 2309-4990
    URL: Article
    DOI: 10.1177/2309499019876073
    Sprache: Englisch
    Verlag: SAGE Publications
    Publikationsdatum: 2019
    ZDB Id: 2128854-9
    Standort Signatur Einschränkungen Verfügbarkeit
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