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Abstract

The distal weight-bearing implant was selected from a pool of approximately 17 implant systems that utilize the osseointegration mechanism currently available globally. It stands out due to its modernity, rarity, and creative concept, offering amputees with ``above-knee amputation'' a range of options that ensure their satisfaction and fulfill their requirements. However, this implant requires additional refinement and adaptation to achieve the highest level of perfection. This research implemented various modifications to the mechanical design of the implant, which were subsequently evaluated using the finite element analysis software ``ANSYS.'' Modifications included substituting the threads along the femoral stem with a groove (internal cut threads) or external thread, while the groove depth was adjusted to enhance stability, while the thread profile was modified to improve mechanical engagement with the bone, resulting in four distinct designs. The mechanical forces acting on the implant at the midstance phase within the femur were simulated and compared to those of the traditional implant under standardized conditions. The results showed that the new modifications exhibited superior resistance to ``total deformation,'' a safer value for ``Von-mises'' stresses, and a significantly higher (based on observed mechanical performance trends) ``safety factor'' compared to the traditional design. These findings highlight the potential of the modified implant design to offer improved mechanical performance and patient satisfaction.

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