Quantifying the Human Subchondral Trabecular Bone Microstructure in Osteoarthritis with Clinical CT

Area of Science:

• Orthopedics
• Radiology
• Biomedical Engineering

Background:

• Osteoarthritis (OA) involves significant changes in subchondral bone microstructure, not just cartilage.
• Accurate assessment of bone changes is crucial for understanding OA progression.

Purpose of the Study:

• To evaluate the efficacy of clinical computed tomography (CT) in quantifying 3D subchondral bone microstructural parameters in human OA.
• To compare clinical CT measurements with micro-computed tomography (micro-CT), the established gold standard.

Main Methods:

• Quantitative 3D analysis of subchondral bone microstructural parameters using clinical CT (287 µm and 331 µm resolution) in human tibial plateaus.
• Comparison of clinical CT data with high-resolution micro-CT (35 µm) in ex vivo samples.
• Assessment of inter- and intraobserver reliability and relative differences for clinical CT measurements.
• Multivariate analyses to differentiate between normal, mild-to-moderate, and severe OA stages using various imaging resolutions.

Main Results:

• Clinical CT demonstrated strong correlations with micro-CT for key microstructural parameters in mild-to-moderate and severe OA.
• High inter- and intraobserver reliability and small relative differences were observed with clinical CT.
• Clinical CT successfully identified characteristic expanded trabecular structures in severe OA and correlated microstructural changes with OA severity.
• Multivariate analyses reliably distinguished between mild-to-moderate and severe OA, showing high similarity between 287 µm clinical CT and 35 µm micro-CT.

Conclusions:

• Clinical CT enables accurate quantitative measurement of subchondral bone microstructure, comparable to micro-CT.
• This technology provides a reliable and accessible method for monitoring bone changes in OA.
• Clinical CT serves as an advanced tool for investigating OA and other bone-affecting diseases in clinical and experimental settings.