Study on Wear Debris Characterization of Polycarbonate Urethane (PCU) as a Bearing of Artificial Hip Joint

As with all artificial joints, wear debris is of particular concern due to its effect on both implant life and the in vivo biological reactions that can occur. The purpose of the research is to study debris characterization of PCU. Wear particle is produced from testing the PCU material using a pin on disc wear tester within 50000 cycles. This study showed that the PCU wear debris gotten from the simulator had various different shapes, including laminar and spherical types. The morphology of worn surface and wear debris analysis showed that wear mechanism of PCU were fatigue wear. Thus we conclude that PCU is expected to be a lifetime implantation of artificial joint.

Treatment of deep periprosthetic hip infection with articulating cement-antibiotic spacers with silver plates and antibiotics

The aim of this work is to improve the results of treatment of patients with a deep periprosthetic hip joint infection by using an articulating cement-antibiotic spacer in combination with silver plates and antibiotics.Material and methods. The treatment outcomes of 52 patients operated at the Swedish-Ukrainian Angelholm Medical Center for the period from 2017 to 2020, who underwent two-stage revision arthroplasty for the deep periprosthetic infectious-inflammatory process of the hip joint, were studied. In addition, 9 patients were examined in whom, during the first stage of a two-stage treatment of an artificial hip joint infection, an articulating cement-antibiotic spacer made of bone cement with a silver content was developed.Research results. Long-term results of two-stage revision arthroplasty with the introduction of our proposed cement-antibiotic spacers were studied in 49 (94.2%) patients. Among them, 9 patients used silver plates, which showed good patient tolerance and in all cases the infection was overcome. In 49 patients in whom the long-term results of two-stage revision hip arthroplasty were studied, 44 (89.8%) achieved eradication of the infection with restoration of the function of the operated limb. We rated such results as good. The average HHS score in this group was 87.18 ± 6.44 points.Conclusions. An innovative method of treatment of deep periprosthetic infection of the hip joint has been introduced into clinical practice, which consists in increasing the effectiveness of using an articulating cement antibiotic spacer by adding silver plates to it and, in addition, an antibiotic.

An assessment of biomaterials for hip joint replacement

Hip replacement is a surgical process where natural hip joints are replaced by artificial hip joint that helps the human being for getting better lifestyle by reduction in the unavoidable pain and better leg movement. The selection of material and durability of the hip joint replacement are serious significance for the implantation, because it determines how load is transferred through the stem. In the selection of materials, various problems related to hip joint replacement are found like adverse tissue reaction, allergic reaction, wear and corrosion resistance etc. To overcome this problem one has to create different new biomaterial. This review gives brief description about the different biomaterial used for hip joint replacement.

Biological Safety Evaluation and Surface Modification of Biocompatible Ti–15Zr–4Nb Alloy

We performed biological safety evaluation tests of three Ti–Zr alloys under accelerated extraction condition. We also conducted histopathological analysis of long-term implantation of pure V, Al, Ni, Zr, Nb, and Ta metals as well as Ni–Ti and high-V-containing Ti–15V–3Al–3Sn alloys in rats. The effect of the dental implant (screw) shape on morphometrical parameters was investigated using rabbits. Moreover, we examined the maximum pullout properties of grit-blasted Ti–Zr alloys after their implantation in rabbits. The biological safety evaluation tests of three Ti–Zr alloys (Ti–15Zr–4Nb, Ti–15Zr–4Nb–1Ta, and Ti–15Zr–4Nb–4Ta) showed no adverse (negative) effects of either normal or accelerated extraction. No bone was formed around the pure V and Ni implants. The Al, Zr, Nb, and Ni–Ti implants were surrounded by new bone. The new bone formed around Ti–Ni and high-V-containing Ti alloys tended to be thinner than that formed around Ti–Zr and Ti–6Al–4V alloys. The rate of bone formation on the threaded portion in the Ti–15Zr–4Nb–4Ta dental implant was the same as that on a smooth surface. The maximum pullout loads of the grit- and shot-blasted Ti–Zr alloys increased linearly with implantation period in rabbits. The pullout load of grit-blasted Ti–Zr alloy rods was higher than that of shot-blasted ones. The surface roughness (Ra) and area ratio of residual Al2O3 particles of the Ti–15Zr–4Nb alloy surface grit-blasted with Al2O3 particles were the same as those of the grit-blasted Alloclassic stem surface. It was clarified that the grit-blasted Ti–15Zr–4Nb alloy could be used for artificial hip joint stems.