# Research progress on osseointegration performance of porous structure-modified titanium alloy implants

## TL;DR

This review discusses how modifying the porous structure of titanium implants can improve their integration with bone and address challenges in bone defect repair.

## Contribution

The paper provides design-oriented insights and integrates recent preclinical evidence on how porous architectures affect osseointegration in titanium implants.

## Key findings

- Porous architectures can tailor the elastic modulus and promote bone ingrowth in titanium implants.
- Pore topology, size, and porosity significantly influence osseointegration performance.
- Additive manufacturing methods offer advantages over traditional techniques for creating porous titanium implants.

## Abstract

Large bone defects remain a major clinical challenge and often require load-bearing implants for reconstruction. Titanium alloys are widely used for bone defect repair because of their favorable mechanical properties and biocompatibility; however, their high elastic modulus and limited bioactivity can cause stress shielding and insufficient osseointegration. Porous architectures have therefore been introduced to tailor the elastic modulus and promote bone ingrowth. This review summarizes current clinical applications and unresolved challenges of porous titanium implants, and integrates recent preclinical evidence on manufacturing routes and key design parameters. We analyze how pore topology (periodic versus stochastic architectures), pore size, porosity, strut diameter, and multiscale designs affect osseointegration. Overall, the review provides design-oriented insights and highlights prospects and challenges for future preclinical and clinical research to improve the osseointegration of porous titanium implants.

Graphical abstract summarizing key design parameters (pore shape, size, porosity, etc.) and manufacturing methods of porous titanium alloy implants.Infographic illustrating a porous scaffold at the center with labeled factors influencing its design, such as porosity, strut diameter, pore size, stochastic architectures, multiscale structure, and pore shape. Below, panels compare traditional manufacturing methods—vapor deposition, plasma spraying, and combustion synthesis—with additive manufacturing methods: electron beam melting, selective laser melting, and selective laser sintering, each depicted with schematic diagrams.

Graphical abstract summarizing key design parameters (pore shape, size, porosity, etc.) and manufacturing methods of porous titanium alloy implants.