## 2 Methodology
### Engineering Drawing  
Given the thread failures observed during the consolidation phase, a more detailed and focused analysis is essential. The next step involves creating a 3D engineering drawing of the intramedullary nail using SolidWorks software version V8.2, as shown in Figure 2, to accurately capture its design and dimensions. This detailed 3D engineering drawing provides a comprehensive solution to the thread failure issue during the consolidation phase by enabling an in-depth examination of the nail's design, including thread geometry, pitch, depth, and their interaction with the overall structure. It ensures dimensional accuracy, offering precise measurements of the nail's components. The 3D representation helps identify potential weak points and areas of stress concentration within the thread design, highlighting zones vulnerable to failure. This drawing is crucial for simulating and stress-testing the nail's performance under real-world conditions, predicting where and how thread failures may occur. Additionally, it serves as a key communication tool, fostering collaborative discussions among medical professionals, engineers, and researchers to collectively understand the nail's intricacies. Including this drawing in the documentation process ensures a visual reference for ongoing analysis and improvement efforts. This meticulous approach underscores the commitment to enhancing the safety and reliability of intramedullary nails in orthopedic procedures, ultimately contributing to the well-being and successful recoveries of patients. Figure 3 illustrates an improvised rig designed for simulation purposes. This rig is constructed using a segment extracted from the central portion of the treads, as shown in Figure 2, constituting a significant advancement in addressing the thread failure issue of intramedullary nails during the consolidation phase. This rig serves as a practical tool to replicate the real-world conditions these nails face, allowing for detailed testing and analysis. Unlike the 3D replication of the intramedullary nail seen in Figure 2, which is primarily for visual analysis, the rig in Figure 3 is designed for simulation and practical testing. This setup not only allows for the simulation of stress, strain, and torque on the intramedullary nail, but also facilitates the manufacturing of physical prototypes for thorough testing. The rig is instrumental in identifying weak points in the nail's design, assessing its response to various stresses, and ultimately enhancing the design and safety of these essential medical devices. It marks a crucial step forward in developing reliable and secure intramedullary nails for orthopedic procedures, promising improved outcomes and patient well-being during the critical consolidation phase. As for threads, downscaling the thread size of the intramedullary nail from 0.30 mm to 0.25 mm and upscaling it to 0.35 mm and 0.40 mm provides a valuable range of simulations for the in-depth analysis of potential thread failure during the consolidation phase. This  
Figure 2: Overall layout of the 3D engineering drawing: (**a**) Intramedullary nail; (**b**) Cross-sectional view. adjustment in thread size allows for the examination of various scenarios and their impact on the nail's performance. Here's how these simulations can contribute to further analysis: 0.25 mm Thread Simulation: Purpose: This simulation with a smaller thread size helps assess the nail's performance under conditions where the thread dimensions are closer to their lower tolerance limits. Insights: It can reveal how the nail copes with reduced thread dimensions, potentially highlighting areas of heightened vulnerability and stress concentration. 0.30 mm Thread Simulation: Purpose: This simulation provides a baseline for comparison and evaluation against all the other threads. Insights: It can help determine the differences by setting a baseline for comparison.