Optimization and Performance Analysis of Controllable Irregular Porous Bone Implant Structures.

Area of Science:

• Biomaterials Engineering
• Medical Device Design
• Computational Mechanics

Background:

• Voronoi tessellation enables biomimetic irregular implants but faces challenges with seed point control and randomness.
• Conventional irregular structures exhibit poor reproducibility and localized mechanical defects, limiting their clinical application.

Purpose of the Study:

• To develop a controllable irregular porous structure design method using Poisson disk sampling for enhanced biomimetic implants.
• To investigate the impact of design parameters on porous structure characteristics and mechanical performance.
• To validate simulation predictions with experimental compression tests.

Main Methods:

• Poisson disk sampling was employed to homogenize seed point distribution for controllable randomness.
• Systematic investigation of design parameters influencing porous structure morphology.
• Finite element analysis (FEA) to evaluate mechanical behavior.
• 3D printing of porous specimens followed by compression testing for experimental validation.

Main Results:

• The proposed method improved structural randomness and mechanical properties compared to traditional designs.
• Irregular porous structures demonstrated more favorable stress distributions and reduced elastic modulus.
• Alleviation of stress shielding effects, meeting biomedical implant requirements.
• Experimental results showed good agreement with FEA predictions.

Conclusions:

• Controllable irregular porous structures designed with Poisson disk sampling offer superior performance for bone implants.
• This method addresses limitations of conventional designs, improving reproducibility and mechanical integrity.
• The findings support the strong potential of these structures for advanced bone implant development.