International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 11 Issue: 10 | Oct 2024
p-ISSN: 2395-0072
www.irjet.net
Study of the mechanical behavior of the dual mobility hip joint in different activities of the patient. Le Thi Bich Nam School of Mechanical Engineering, Hanoi University of Science and Technology, No.1 Dai Co Viet Road, Hanoi, Vietnam ---------------------------------------------------------------------***---------------------------------------------------------------------
Abstract - Previous studies on the mechanical behavior of
biocompatibility and transparency in X-rays or CT scans, allowing for more accurate assessments. When PEEK is reinforced with carbon fiber, it can match the strength and stiffness of natural human bone, preventing stress imbalance with surrounding bone and ensuring even force distribution. Stem made from PEEK material to increase the bond with bone, it is necessary to use more bio-cement or add HA coating by Plasma coating method. Nowadays, PEEK-CF material is gradually replacing Titanium in its applications [5]. In this research, parts of AHJ made of metal (Cobanchrome, Titanium) and CF-PEEK are investigated.
artificial hip joints have focused on standard joints, which only allowed the movement of the head in the liner. The finite element method was used to investigate a part of the joint assembly in different patient activities. In this study, the finite element method was effectively used to investigate the mechanical behavior of the dual mobility hip joint, which is a type of joint that allows for more extensive joint degree movements. The mechanical behaviors investigated include the equivalent Von-Mises stress, the total deformation, the total displacement, the contact pressure, and the sliding distance in human activities such as daily walking and difficult positions such as sitting on a chair or sitting on the floor. Additionally, the materials used to manufacture hip joints have been expanded to include biomaterial with strength equivalent to human bones, such as CF-PEEK plastic, in addition to materials commonly used for hip joints such as Cobalt-Chrome, Titanium, etc.
The finite element method (FEM) is an essential mechanical analysis method used to evaluate mechanical behaviour of the artificial hip joint. It is used to simulate the effects of motion and loading on artificial joints. Al-Shammari [9] used FEM to study a standard hip joint model, investigating different angles of the stem to find the optimal angles of implants, and investigating the mechanical behaviour of AHJ made of aluminium and CoCr alloy materials in the normal walking posture of the patient. Eko Saputraa et al. [3] also used FEM to investigate the stress in the Liner and Head assembly in different sitting postures of the patient including sitting on a chair, squatting, kneeling, and bowing.
Key Words: Artificial hip joint, Implant, Human activities, Mechanical behaviour of AHJ, Sliding distance, Finite element method, Biomaterial …
1.INTRODUCTION
Previous studies have mainly focused on standard hip joints or only examined specific parts of the hip assembly [9], such as the contact between the liner and the head, or the cupliner contact [3]. This study extends the investigation of mechanical behaviour to the dual mobility hip joint, a type of hip designed to spread motion angles. The dual mobility hip allows two motions: the Head can move in the Liner and the Liner can move in the acetabular Cup. As a result, this implant has the potential to reduce the risk of dislocation and improve joint stability, making it suitable for younger patients with a wide range of movements. Most of the patient's movement postures in daily life were surveyed, including standing, sitting on chairs, and sitting on the ground. The mechanical behaviours that were studied included stress distribution, deformation distribution, and displacement distribution on the joint details. Additionally, the study also examined the contact pressure and sliding distance between the articulating parts.
The hip joint plays a crucial role in supporting the body's weight during daily activities, connecting the lower limbs to the spine, and transmitting force from the ground to the top. The need for artificial hip joint (AHJ) replacement is increasing, with elderly individuals suffering from joint disease or deformities, as well as younger individuals due to vigorous activities or accidents. The main reasons for hip replacement include osteoarthritis, fractures, and changes in bone structure and connective tissue, leading to loss of motor function and pain. After hip replacement surgery, issues such as joint slippage, friction between joint parts causing wear, and the release of metal particles into the body need to be considered. Additionally, the durability and longevity of the artificial joint during the patient's activities and overtime are important factors. Previous studies have used metallic materials for hip joints, but these have drawbacks such as incompatibility with the human body and obstruction in Xrays. To address these issues, the use of plastics like HDPE for the Liner and PEEK for the Stem and Cup of artificial hip joints has been explored. These materials offer
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