Disease Duration and Stage Influence Bone Microstructure in Patients With Primary Biliary Cholangitis

Area of Science:

• Bone biology and metabolism
• Hepatology
• Radiology and imaging

Background:

• Primary biliary cholangitis (PBC) is a known risk factor for osteoporosis, leading to reduced bone mineral density (BMD).
• The precise extent of macro- and microstructural bone alterations and their causative factors in PBC remain unclear.

Purpose of the Study:

• To investigate the detailed macro- and microstructural bone changes in patients with PBC.
• To identify factors associated with bone loss in PBC.

Main Methods:

• Retrospective analysis of 96 PBC patients and 53 healthy controls.
• Dual-energy X-ray absorptiometry (DXA) for BMD measurements.
• High-resolution peripheral quantitative computed tomography (HR-pQCT) for bone microstructure assessment.
• Serum analyses and disease staging.

Main Results:

• PBC patients showed significantly reduced volumetric BMD, cortical thickness, and bone volume per tissue volume in the radius and tibia.
• Disease duration and stage were independently associated with bone loss in PBC.
• No significant bone structure differences were observed in PBC patients with co-existing autoimmune hepatitis (AIH).

Conclusions:

• PBC patients exhibit severe bone microstructural alterations, predominantly decreased BMD and cortical thickness.
• Bone loss in PBC is significantly associated with disease duration and stage.
• HR-pQCT is effective in detecting this combined bone loss syndrome in PBC.