Aim: The screw length is important to achieve a stable fixation for medial malleoli fractures. We aimed to evaluate the optimal screw length for different age groups in surgically treated medial malleoli fractures. The second aim was to identify the utility of the distance of epiphyseal scar to joint line or joint line to medullary space for assessment of screw length.
Material Method: 368 X-rays and computed tomography (CT) images of ankle joints were retrospectively evaluated for optimal screw length, epiphyseal scar to joint line distance, joint to medullary space distance. The mean screw length for each decade was calculated. The correlations of screw length with age, screw length with distance of epiphyseal scar to joint line, and screw length with distance of joint line to medullary space were evaluated.
Results: The optimal screw length was obviously decreased in patients in 61-70 and >70 years old group (p = 0.002). As the distance of epiphyseal scar from joint line was increased, the optimal length of screw was also increased (p = 0.001). The distance of epiphyseal scar from joint line was decreased by age (p = 0.011).
Conclusion: The optimal screw length was decreased by age and the epiphyseal scar to joint line distance could be a clue for optimal screw length in medial malleoli fractures.
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http://dx.doi.org/10.1016/j.injury.2019.03.006 | DOI Listing |
Objective: Aim: Study the mechanism of interaction between the 'sacroiliac joint - screw' system and determine the optimal parameters of the stabilizing structure, the strength of the system connection through computer modeling, and anatomical-biomechanical experiment.
Patients And Methods: Materials and Methods: The optimal parameters of the stabilizing structure for the sacroiliac joint were calculated using software package MathCAD. To validate the results of the numerical modeling, corresponding investigations of mechanical characteristics and determination of stiffness of the studied systems were conducted by an upgraded testing stand, TIRAtest-2151.
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January 2025
Department of Hand Surgery, Huashan Hospital Fudan University Shanghai, China; Department of Hand and Upper Extremity Surgery, Shanghai Jing'an District Central Hospital, Shanghai, China; National Clinical Research Center for Aging and Medicine, Huashan Hospital, Fudan University, Shanghai, China; NHC Key Laboratory of Hand Reconstruction, Fudan University, Shanghai, China.
Introduction: This study presents an innovative arthroscopy-assisted total wrist arthrodesis technique utilising three hollow screws, aimed at improving clinical outcomes for patients with severe wrist arthritis.
Materials And Methods: The technique involved the placement of three hollow screws to facilitate wrist bone fusion. Between August 2019 and August 2023, four patients diagnosed with severe wrist arthritis underwent the arthroscopy-assisted procedure.
Injury
January 2025
Department of Surgery, The Trauma and Orthopaedic Research Unit, The Canberra Hospital, Garran, Australian Capital Territory, Australia.
Background: Unstable posterior pelvic-ring fractures are rare and difficult to manage. There are many injury patterns, they are associated with high morbidity and mortality, and optimal surgical management remains contentions. This study aims to compare outcomes and complications for different surgical management of these injuries.
View Article and Find Full Text PDFPolymers (Basel)
January 2025
Department of Mechanical Engineering, University of Massachusetts Lowell, Lowell, MA 01854, USA.
This study presents the design, modeling, and validation of a mixing screw for energy-efficient single-screw extrusion. The screw features a short length-to-diameter (L/D) ratio of 8:1 and incorporates double flights with variable pitch and counter-rotating mixing slots. These features promote enhanced plastication by breaking up the solid bed and improving thermal homogeneity through backflow mechanisms relieving a 3.
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January 2025
Faculty of Mechanical Engineering and Design, Kaunas University of Technology, 51424 Kaunas, Lithuania.
In recent years, microfluidics has emerged as an interdisciplinary field, receiving significant attention across various biomedical applications. Achieving a noticeable mixing of biofluids and biochemicals at laminar flow conditions is essential in numerous microfluidics systems. In this research work, a new kind of micromixer design integrated with an Archimedes screw is designed and investigated using numerical simulation and experimental approaches.
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