Rapid increase in marrow fat content and decrease in marrow perfusion in lumbar vertebra following bilateral...

Area of Science:

• Bone Metabolism
• Reproductive Endocrinology
• Medical Imaging

Background:

• Bilateral oophorectomy causes bone mineral density (BMD) loss.
• Reduced BMD correlates with increased bone marrow fat and decreased perfusion.
• The timing of these post-surgical changes is not well-established.

Purpose of the Study:

• To determine the timeline of BMD, marrow fat, and perfusion changes after bilateral oophorectomy.
• To investigate the early effects of surgical menopause on bone microenvironment.

Main Methods:

• Six women undergoing hysterectomy and bilateral salpingo-oophorectomy were studied.
• Quantitative CT for BMD, MR spectroscopy for fat fraction (FF), and dynamic contrast-enhanced MRI for perfusion were used.
• Measurements were taken pre-surgery and at 3, 9, and 21 months post-surgery.

Main Results:

• A significant decrease in BMD (12.5%) and perfusion (23.6% enhancement slope) occurred within 3 months.
• Bone marrow fat fraction (FF) increased significantly (92.2%) within 3 months.
• These changes continued at a slower rate over 21 months, with statistically significant trends (p < 0.05).

Conclusions:

• Bilateral oophorectomy rapidly induces significant reductions in lumbar BMD.
• Surgical menopause leads to a rapid increase in bone marrow fat content.
• Marrow blood perfusion significantly decreases following oophorectomy.