If the nondominant arm has a previous fracture, which arm should be scanned instead?

• A. Always the dominant arm
• B. Never switch arms
• C. Either arm can be used
• D. Nondominant arm, regardless of fracture

Answer: (A)

When considering the situation of a previous fracture in the nondominant arm, scanning the dominant arm is generally the preferred choice. This recommendation is based on the understanding that the dominant arm typically experiences greater mechanical loading and is often stronger, which can provide a clearer picture of bone density in a more representative context for overall skeletal health.

In cases where a fracture is present, scanning the arm with a previous injury may not yield accurate results due to potential changes in bone density or morphology as a result of the fracture, healing process, or any associated complications. The dominant arm generally remains unaffected by a prior injury in the nondominant arm, making it a better option for assessment.

This approach is consistent with best practices in bone densitometry, aiming to obtain the most reliable data for evaluating bone health and determining the risk of osteoporosis or other bone-related issues.