Crohn's and bones: assessing bone microarchitecture using high-resolution peripheral quantitative computed...

Area of Science:

• Orthopedics and Bone Health
• Gastroenterology and Inflammatory Bowel Disease Research
• Medical Imaging and Bone Densitometry

Background:

• Crohn's disease (CD) negatively impacts bone mineral density (BMD).
• Two common CD phenotypes are inflammatory (non-stricture) and stricturing.
• Limited research exists on bone quality differences between CD phenotypes using advanced imaging.

Purpose of the Study:

• To investigate bone quality variations between inflammatory and stricturing CD phenotypes.
• To assess differences in volumetric BMD, bone microarchitecture, geometry, estimated strength, and void spaces.
• To utilize high-resolution peripheral quantitative computed tomography (HR-pQCT) for detailed bone analysis.

Main Methods:

• A cross-sectional study involving 61 participants (≥55 years) with CD.
• HR-pQCT (XtremeCT II) scans of the distal radius and tibia.
• Finite element analysis for bone strength estimation and void space analysis for structural inhomogeneities.

Main Results:

• Males with stricturing CD showed smaller cortical bone area and lower cortical thickness at the tibia compared to inflammatory CD males.
• No significant sex differences were found in these parameters between female groups.
• Compromised bone microarchitecture was observed in the stricturing CD group at both radius and tibia compared to the inflammatory group.

Conclusions:

• Significant differences in bone microarchitecture and geometry exist between inflammatory and stricturing CD phenotypes.
• Sex-specific differences in bone geometry were noted, particularly in males with stricturing CD.
• Future research should be prospective and consider CD phenotype and sex for accurate skeletal health and fracture risk assessment.