Bone scan can identify stress fractures, infection, and tumors. It can detect bone disease with as little as what percentage of bone loss?

Bone scan can identify stress fractures, infection, and tumors. It can detect bone disease with as little as what percentage of bone loss?

• A. 1-2%
• B. 4-7%
• C. 10-12%
• D. 20-25%

Answer: (B)

Bone scans pick up bone disease by showing areas of increased osteoblastic activity, so they can reveal metabolic changes long before structural damage shows up on X-rays. Because the tracer highlights these early remodeling processes, the test can detect disease even when only a small amount of bone loss has occurred. The commonly cited threshold is about four to seven percent of bone loss, which explains why a bone scan is useful for early problems like stress fractures, infections, and tumors. This high sensitivity means it would not align with much lower figures (which would imply even earlier detection than is typical) or with much higher figures (which would imply the scan misses problems until more bone is lost).

Bone scans pick up bone disease by showing areas of increased osteoblastic activity, so they can reveal metabolic changes long before structural damage shows up on X-rays. Because the tracer highlights these early remodeling processes, the test can detect disease even when only a small amount of bone loss has occurred. The commonly cited threshold is about four to seven percent of bone loss, which explains why a bone scan is useful for early problems like stress fractures, infections, and tumors. This high sensitivity means it would not align with much lower figures (which would imply even earlier detection than is typical) or with much higher figures (which would imply the scan misses problems until more bone is lost).