Abstract
Although a standardized hip joint prosthesis is a quick and easy solution to repair most diseases related to the hip joint, it never satisfies the patient s personal needs due to the uniqueness of the human anatomy. Femoral hip stem geometry is one of the factors that have an important impact on prosthesis lifespan or the revision surgery frequency that occurs due to postoperative complications, such as impingement or dislocation after THR (Total Hip Replacement). In this sense, the development of a custom hip stem prosthesis starting from a standardized femoral stem can bring benefits to the patient in time, being able to reduce the failure percentage of THR. The purpose of this article is the development of a custom prosthesis based on patient s CT (Computer Tomographic) scans in order to be 3D printed with biocompatible materials, being able to serve as a study model in both engineering and medicine. Also this study represents a first step in understanding how to apply the unique distribution of mechanical properties in human bone, in order to manufacture a hip prothesis that can mimic them.
Highlights
The optimization of the femoral component using the patient's femoral parameters leads to the personalization of the hip prostheses and to hip mechanics improvement, trying to avoid revisions and early replacement of worn hip joint prosthesis
The development of anatomical femoral stem was chosen because the contact between the femur and the stem is made along the curvature of the femoral cavity, leading to better distribution of the external loads or patients’ body weight compared with a straight femoral stem that creates a three point contact (Figure 1)
Even if the protheses currently available on the market has reached an all-time level of development, the unique anatomy of each individual is still a challenge
Summary
The optimization of the femoral component using the patient's femoral parameters leads to the personalization of the hip prostheses and to hip mechanics improvement, trying to avoid revisions and early replacement of worn hip joint prosthesis. Because of the laborious work from designing to production and implantation implicitly, the manufacturing involves high costs and extended time compared to selecting a standard prosthesis. For this reason it was chosen to develop a CAD femoral stem template that could be modified according to the certain patient’s morpho-anatomical landmarks. The development of anatomical femoral stem was chosen because the contact between the femur and the stem is made along the curvature of the femoral cavity, leading to better distribution of the external loads or patients’ body weight compared with a straight femoral stem that creates a three point contact (Figure 1)
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