Publications by authors named "B Frechede"
Predictions of vertebra positions from external data are required in many fields like motion analysis or for clinical applications. Existing predictions mainly cover the thoraco-lumbar spine, in one posture. The objective of this study was to develop a method offering robust vertebra position predictions in different postures for the whole spine, in the sagittal plane.
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- The study evaluates the pull-out resistance of two types of screws used for C2 vertebra instrumentation: bicortical facet screws (FS) and laminar screws (LS), with LS being the more established option due to compatibility issues with anatomy.* -
- In tests conducted on 32 human cadaveric C2 vertebrae, LS demonstrated a significantly higher average pull-out strength (707 N) compared to FS (390 N), indicating that LS is mechanically superior in this context.* -
- The findings suggest that while both methods can be viable, bicortical FS may be less reliable than LS for anchoring in C2 vertebrae, especially when laminar grip is achievable.*
Slouched and Erect Sitting Postures Affect Upper Limb Maximum Voluntary Force Levels and Fatiguability: A Randomized Experimental Study.
IISE Trans Occup Ergon Hum Factors
October 2022
OCCUPATIONAL APPLICATIONSModifying the spinal curvature is an empirical approach to treating upper limb musculoskeletal disorders, often attributed to the balance between physical stress and individual functional capacities. We completed an experimental biomechanical study to quantify the effect of seated spinal posture on upper limb functional capacities. Isometric maximum muscle voluntary forces (MVFs) were measured at participants' shoulder, elbow, and wrist.
View Article and Find Full Text PDFShort isthmic versus long trans-isthmic C2 screw: anatomical and biomechanical evaluation.
Eur J Orthop Surg Traumatol
October 2016
Article Synopsis
- The Harms technique is recognized as the best method for stabilizing the C1-C2 cervical spine, but it still carries a risk of vertebral artery injury, especially with long screws close to the artery.
- A study aimed to compare the pull-out strength of long screws (LS) and short screws (SS) for C2 stabilization using 13 human cadaveric spines, measuring their effectiveness.
- Results showed that LS provided significantly greater pull-out strength and stiffness compared to SS, making LS the preferred choice unless the isthmus width is too narrow for a 3.5-mm screw.
A framework towards personalisation and active muscle integration in a 3D finite-element neck model for orthopaedic applications.
Comput Methods Biomech Biomed Engin
December 2014