Evaluating the Impact and Norming the Parameters of Partially Regular Texture on the Surface of the Articulating Ball Head in a Total Hip Joint Prosthesis

Abstract

The theoretical study and evaluation of stress-strain condition of the friction pair's surfaces of total hip joint prosthesis with partially regular texture on a ball head surface, depending on the values of its characteristic parameters, using finite element modeling are performed. It has allowed formulating the recommendations for dimple's spacing rationing and the extent of a surface rough site with partially regular texture, aiming to increase the prosthesis' lifespan. The problem is solved from the condition of dry or boundary lubrication. For the indicated range of nominal contact pressure in hip joint, the quantitative evaluation of allowable roughness parameters to which it is necessary to process the ball head surface for metal-on-metal and metal-on-polymer friction pairs are obtained, considering the dimple's spacing and size on the surface.

Current Trends in Improving of Artificial Joints Design and Technologies for Their Arthroplasty

“…Thus, the micro texture in the form of micro dimples, created, for example, on the surface of the total hip joint head, hypothetically contributes to the improvement of the tribological properties of the friction couple, and, thereby, to the increase of its service life. The results of numerical simulations performed by the authors of this work (Pakhaliuk et al, 2016) generally confirm this hypothesis and indicate the relevance of the development of this area of research, focused on reducing the wear of total hip joint friction couples, and as a consequence, the likelihood of complications after THA.…”

“…However, as shown in Zhao et al (2000), Gao et al (2010), and Pakhaliuk et al (2016), one can also reduce wear in friction coupling with UHMWPE or XLPE by mechanically modifying the surfaces of friction couples, including by applying regular micro texture in form, for example, of dimples on the surfaces of total hip joint elements. This effect can be explained, for example, from the standpoint of the molecular-mechanical theory of I.V.…”

Modifying and Expanding the Simulation of Wear in the Spherical Joint With a Polymeric Component of the Total Hip Prosthesis

“…For preliminary wear evaluation of the sliding surfaces, including modified, the finite element analysis and various wear models (see, e.g., [4,5] and other sources) are now widely used. In particular, for the THR with a UHMWPE polymeric component the wear simulation is based on the classical Archard equation together with all other studies reported in literature referred to, for example, in [6,7,8], where the wear factor is taken as a constant value.…”

The Ceramic Modular Head Improvement in the Design of a Total Hip Replacement

“…In addition, it can be reasonably assumed that when using a friction pair of a partially regular micro texture in the form of dimples, applied, for example, to the THR head surface, a ceramic-on-UHMWPE pair will be more effective from a tribological point of view. The presence of such an artificial lubricant pockets, as a rule, prevents the bonding of articulated surfaces of the tribological pair, promotes removal of the wear process products into dimples from a contact area, and feeds the frictional contact with a portion of the lubricant during its operation [5]. Thus, the above performances of THR with a ceramic-on-UHMWPE friction pair indicate their competitive advantages compared with analogues.…”