Postfailure compressive behavior of tibial trabecular bone in three anatomic directions

Area of Science:

• Orthopedics
• Biomechanical Engineering
• Materials Science

Background:

• Understanding the mechanical behavior of human proximal tibial trabecular bone is crucial for orthopedic applications.
• Trabecular bone's mechanical properties are influenced by its density and structural orientation.

Purpose of the Study:

• To characterize the postfailure mechanical behavior of human proximal tibial trabecular bone.
• To correlate key mechanical parameters with bone ash density across different anatomic directions.

Main Methods:

• Cube specimens of human proximal tibial trabecular bone were subjected to mechanical compression testing beyond failure.
• Stress-strain relationships were analyzed to define parameters including elastic modulus, strength, and postfailure behavior.
• Correlations between mechanical parameters and ash density were assessed in three anatomic directions.

Main Results:

• All tested mechanical properties, except postfailure slope and strain during maximum stress, significantly correlated with ash density in all directions (p < 0.05).
• Postfailure slope showed significant correlation in mediolateral and superior-inferior directions.
• Strain during maximum stress was only correlated in the superior-inferior direction.

Conclusions:

• The study provides data to estimate trilinear stress-strain relationships for proximal tibial trabecular bone based on density.
• These findings represent a foundational step towards developing computational models for trabecular bone behavior before, during, and after failure.