Porous titanium alloy for fixation of knee prostheses

Abstract

SummaryA porous titanium alloy called void metal composite (VMC) was investigated for use in knee prosthesis fixation. The interfacial ingrowth fixation of VMC intrarneduallary, subchondral, and variable density implants in goat femora was evaluated biornechanically and histologically at six weeks and five months. Biomechanical tests were done under static shear and dynamic, cyclic (fatigue) loading conditions. Readily identifiable bone, strong fixation, and excellent biocompatibility were typical. Some subarticular implants appeared to induce normal hyaline cartilage overgrowth.

Bone ingrowth into weight‐bearing porous fiber titanium implants. Mechanical and biochemical correlations

“…The pore size of the implants in this study should average 400 km (26). This pore size should be optimal under the given conditions (18,259. The total amount of ingrown bone is determined by the stresses of successful weight-bearing (7).…”

“…Thirty-six cylindrical fiber titanium disks made from the Ti-6A1-4V alloy (18) were used. They were 5.0 mm diameter by 3.0 mm height with a central hole (0 = 1.3 mm).…”

Osteogenic Phenomena Across Endosteal Bone-Implant Spaces with Porous Surfaced Intramedullary Implants

“…Several investigators have established firm fixation of porous intramedullary rods or nails by osseous tissue ingrowth. In some of these studies the medulla was reamed out such that a uniform, tight fit of the implants up against endosteal cortical bone was achieved (Nilles et al 1974, Dorre et al 1976, Miller et al 1976. In other studies the implants only came into partial contact with endosteal cortical bone (Collier et al 1976, Ducheyne et al 1977.…”

Structure Formation during Preparation of Variable Porosity Titanium Foams by Solid State Replication

“…Due to their low density, high strength and high chemical resistance, titanium and its alloys are primary candidates for industrial foam manufacture having been successfully used for structural applications, e.g. cores in sandwich panels [4] or bone-replacement implants [5][6][7][8][9][10]. Unlike lowmelting point aluminum, magnesium or zinc, titanium is a highly reactive refractory metal which cannot be foamed in the liquid state, efforts to do so leading to contamination and embrittlement.…”