What is the approximate ratio of cortical to trabecular bone in the body?

• A. 60% cortical, 40% trabecular
• B. 80% cortical, 20% trabecular
• C. 70% cortical, 30% trabecular
• D. 90% cortical, 10% trabecular

Answer: (B)

The ratio of cortical to trabecular bone in the body is typically understood to be approximately 80% cortical and 20% trabecular. This distribution is significant because cortical bone, which forms the dense outer layer of bone, provides structural support and strength, while trabecular bone, found mostly in the interior of bones, contributes to bone metabolism and supports the overall skeletal framework. Understanding this ratio is essential for comprehending bone health and diseases such as osteoporosis, where the balance between these two types of bone can be disrupted.

This knowledge is vital in the context of bone densitometry, as it informs the interpretation of bone density measurements and helps in assessing fracture risk. Recognizing that cortical bone is more prevalent in the body can help in understanding how different bone types respond to various conditions and treatments. The choice of 80% cortical and 20% trabecular reflects established anatomical and physiological understanding of bone composition, making it the most accurate answer in this scenario.