Abstract
Wear is a key factor affecting the survivorship of artificial hip joints. Joint wear testers, as called ‘simulators’ are developed to simulate the motions and force of human joints. By using simulators, in vitro wear tests could be performed for artificial joints. This paper introduces a new hip joint simulator developed for the biotribological investigation of artificial hip joints. Friction force measuring module has been set up and assembled to monitor the friction force during the wear tests. Validation tests have been performed using two kinds wear couples of 28mm CoCrMo femoral heads against conventional and X-linked ultra high molecular weight polyethylene (UHMWPE) acetabular cups. The hip joint simulator is a precise and reliable method both for the wear evaluation and biotribological investigation of hip prostheses.
Highlights
Total Hip Replacement (THR) surgeries are considered as an efficient method to treat degenerative joint diseases
The purpose of this paper is to provide the features and development of this novel hip joint wear tester
The HSMS4203 applies similar principles with the biaxial simulator known as BRM
Summary
Total Hip Replacement (THR) surgeries are considered as an efficient method to treat degenerative joint diseases. The survivorship of THR decreases dramatically after 15 years of use (Ferguson et al, 2018). A typical clinical wear rate of ultra-high molecular weight polyethylene (UHMWPE) cups, of 100∼300 μm/year, will lead to loosening, inflammation and failure (McKellop et al, 1995). Efforts are seriously needed to prolong the survival of the hip prostheses, which is important for optimizing patient care and medical costs (Chu, 2015). The bio-tribological performance of orthopedic implants has been gaining increasing attention. The tribological evaluation of such kinds of implants is regarded as an essential evaluation of hip prostheses
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