Development and Verification of a Porous Acetabular Shell Design Manufactured Using Additive Technology.

Introduction: Porous surface acetabular shells have been successfully used in cementless total hip arthroplasty. Recent advances in additive manufacturing have provided opportunities to optimize the shell designs. The current study describes the design and verification of a new acetabular shell design.

Effect of interposed tissue and contamination on the initial stability of a highly porous press-fit acetabular cup.

For biologic fixation, press-fit acetabular cups should have initial stability with minimal micromotion and osteoconductive surfaces in contact with bone. Inadequate exposure potentially influences initial stability by increasing the possibility of soft tissue interposition and contamination at the implant-tissue interface. A sawbone model was used to examine how interposed tissue and contamination influence initial cup stability.

Friction in modern total hip arthroplasty bearings: Effect of material, design, and test methodology.

The purpose of this study was to characterize the effect of a group of variables on frictional torque generated by acetabular components as well as to understand the influence of test model. Three separate test models, which had been previously used in the literature, were used to understand the effect of polyethylene material, bearing design, head size, and material combinations. Each test model differed by the way it simulated rotation of the head, the type of frictional torque value it reported (static vs.