Cement-free incorporation of endoprotheses by means of trabecular, three-dimensional interconnected surface structures

Abstract

While the principle of enlarging the surface area has been recognized and used in different ways for some time, there is often no schematic, detailed description or fundamental research. Taking a surface structure consisting of trabecular three-dimensional connecting elements, essential parameters are shown, making it clear that the flexible dynamic reaction of the effective "anchoring space" with a suitable specified shape (construction height, alignment, network) can be reproducibly shaped and used. This has led to a hip endoprosthesis with a graduated surface structure. The construction height of the trabecular structure varies, decreasing from proximal to distal.

Growth behavior, matrix production, and gene expression of human osteoblasts in defined cylindrical titanium channels

“…4 In particular, the surface structure is especially important for implant anchoring. 5 Mittelmaier et al 6 referred to mesostructures in the form of pores, honeycomb patterns, spheres, grids, and grooves, for example, sized 100 -2000 m, which are used on endoprosthetic materials and are intended to ensure bony integration of the material. On the other hand, microstructures Ͻ100 m 6 are below the size necessary for ingrowth of bone tissue in vivo.…”

Effect of surface finish on the osseointegration of laser-treated titanium alloy implants

“…To achieve a porous surface, implants usually have been manufactured as solid rods, and were then sintered with beads or fiber mesh due to the lack of a technology to homogeneously create open interconnecting structures in titanium alloys [28]. However, the sintering process can lead to brittleness and reduced fatigue strength [29].…”

Influence of cementless hip stems on femoral cortical strain pattern depending on their extent of porous coating

“…Cortical strain measurement does not provide direct information concerning the implant-bone interface conditions, which also infl uence the osteointegration of the implants [15,33,51] . As the longterm biological effects of pore size and surface structuring [26,45] cannot be evaluated, the present study focuses on the effects of porous coating on cortical strain pattern in the early postoperative phase, which prepares the ground for later bone remodeling.…”