Masniezam Ahmad
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Preferred name
Masniezam Ahmad
Official Name
Masniezam, Ahmad
Alternative Name
Ahmad, Masniezam H.
Ahmad, M.
Main Affiliation
Scopus Author ID
56272606200
Researcher ID
IXE-4791-2023

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  • Publication
    Finite element analysis of proximal femur under static loading during sideway fall
    (AIP Publishing, 2023)
    Wong Kah Poh
    ;
    Fauziah Che Mat
    ;
    Fauzan Djamaluddin
    ;
    Masniezam Ahmad
    ;
    Nur Saifullah Kamaruddin
    ;
    Ruslizam Daud
    ;
    Ishak Ibrahim
    A femoral fracture happens when the femur gains a very high stress concentration during fall and may results in femur fracture. In fact, most of fall-related cases occur in sideways fall. Bone fracture leads to life quality impairment and even life threatening. In this study, the effect of quasi-static loading on the femur bone during sideway fall is investigated by employing Finite Element (FE) software, ANSYS. The FE model is developed and simulated in the different fall conditions; inclination angle of 10° and rotation angle from -20° to 30°. The capacity of the bone is evaluated in terms of von Mises stress and deformation. The highest stress concentration is found at femoral neck region. 30° rotation angle with 10° inclination angle is observed as the critical loading direction at which the femoral neck may results in fracture. The understanding of the effect of loading magnitude and direction on the femoral bone capacity obtained herewith is useful in assisting the medical practitioner to provide better treatment and reduce repeated treatment cases.
  • Publication
    Stress shielding prediction of unicortical and bicortical screws: a finite element analysis
    (College of Engineering, Universiti Teknologi MARA, 2023)
    Anis Amira Mat Zuki
    ;
    Fauziah Mat
    ;
    Khairul Salleh Basaruddin
    ;
    Ruslizam Daud
    ;
    Masniezam Ahmad
    ;
    Fauzan Djamaluddin
    The stability in an implant fixation plays a vital role in ensuring proper formation and remodelling process of the fractured bone. Failure in implant fixation is commonly associated with short and long-term instability of the bone-implant interface. The bone-implant interaction creates a complicated mechanical interplay that might influence the stress distribution and hence the biomechanical performance stability of the implant fixation. Furthermore, implant screw parameters namely thread size, geometrical design and material properties become additional factors that affect the bone-implant interaction. The purpose of this study was to investigate the effect of unicortical and bicortical screws’ parameters on the screw-bone interaction mechanism. To evaluate the stress transfers between screw and bone, the stress parameters namely stress transfer parameters (STP) was employed. A two-dimensional (2D) finite element model of full treaded screw was simulated while varying the parameters of the screw: two types of material (stainless steel A316 and titanium alloy Ti-6Al-4V), screw length and screw pitch. It was found that the lower in elastic modulus results to the higher stress transfer between implant-bone interface. As the titanium have lower elastic modulus, it gave higher values of STP which help to transmit and distribute stress better compared to the stainless steel. While the effect of varying screw pitch between two types of screws shows that STPs values of fully threaded bicortical screws shows significant result for finer pitch size that may advancing bone remodelling process at the early stage