Screws made up of non-biodegradable materials (Ti-alloy, etc.) have been used since long for temporary joining/fixation in applications involving skeleton damage or bone fracture. These screws need to be removed after complete healing as their sustained presence results in many complications, such as - micro-fracturing, stress shielding, etc. The removal of these screws is a little difficult too as it may result in the healed bone getting broken/damaged again. These problems can be overcome by employing metallic implants (plate, screws, etc.) made up of biodegradable metallic materials (Mg-alloy, etc.). Such implants exhibit optimal mechanical performance, are biocompatible, have adequate biodegradation rates, and rely on a unique design. Internal fracture fixation makes usage of screws with or without an accompanying plate. Buttress-threaded screws are the most frequently used ones. These screws must have the capacity to bear usually occurring loads and hold fractured segments of bone all through the process of healing. Finite element analysis (FEA) is an effective technique used for testing and validation of desired characteristics for Mg-based biodegradable buttress-threaded screw (BBTS). The characteristics of interest include maximum possible pullout resistance to tightly hold segments of bone, torsional ability for tightening or tapping, bending ability during providing plate support by screw head, and resistance to combined loading (tensile/compressive and bending) during the self-support stage using merely the screw(s). According to test results and subsequent validation through discretization error and convergence plot, BBTS made up of Mg-alloy are found safe for regular applications under usually encountered impact loads. Topological optimization and vibration analysis are also performed wherein it is observed that design of BBTS is good enough for possible usage in fracture fixation in orthopaedics.

长期以来，由不可生物降解的材料（钛合金等）制成的螺钉一直被用于涉及骨骼损伤或骨折的应用中的临时连接/固定。这些螺钉需要在完全愈合后移除，因为它们的持续存在会导致许多并发症，例如 - 微骨折、应力屏蔽等。这些螺钉的移除也有点困难，因为它可能导致愈合的骨头断裂/再次损坏。这些问题可以通过采用由可生物降解的金属材料（镁合金等）制成的金属植入物（板、螺钉等）来克服。这种植入物表现出最佳的机械性能，具有生物相容性，具有足够的生物降解率，并且依赖于独特的设计。内部骨折固定使用带有或不带有随附板的螺钉。梯形螺纹螺钉是最常用的螺钉。这些螺钉必须能够承受通常发生的载荷并在整个愈合过程中固定骨折的骨段。有限元分析 (FEA) 是一种有效的技术，可用于测试和验证镁基可生物降解斜螺纹螺钉 (BBTS) 的所需特性。感兴趣的特性包括最大可能的拉出阻力以紧紧固定骨段、拧紧或敲击的扭转能力、螺钉头提供骨板支撑期间的弯曲能力以及自支撑期间的组合载荷阻力（拉伸/压缩和弯曲）阶段仅使用螺钉。根据测试结果和后续通过离散化误差和收敛图的验证，由镁合金制成的 BBTS 在通常遇到的冲击载荷下可安全用于常规应用。还进行了拓扑优化和振动分析，其中观察到 BBTS 的设计足够好，可以用于骨科的骨折固定。