What percentage of skeletal body mass does trabecular bone represent?

• A. 10%
• B. 15%
• C. 20%
• D. 25%

Answer: (C)

Trabecular bone, also known as cancellous bone, plays a significant role in the skeletal system, accounting for approximately 20% of total skeletal body mass. This type of bone is characterized by its lattice-like structure, which contributes to its lightweight yet strong properties, allowing it to effectively support and distribute loads.

In contrast to cortical bone, which makes up the majority of the skeleton and represents about 80% of skeletal mass, trabecular bone is more metabolically active and is involved in mineral storage, particularly calcium. Its distribution is predominantly found in areas of high stress, such as the ends of long bones, the vertebrae, and the pelvis, where it helps to absorb impacts and maintain the integrity of the skeletal framework during physical activity.

Understanding the composition and function of trabecular bone is crucial in the context of bone health, particularly in diagnosing and managing conditions such as osteoporosis, where trabecular bone density is often significantly affected.