What is the most common hip used for a DXA scan of the proximal femur?

• A. Right hip
• B. Left hip
• C. Always the dominant hip
• D. Right or left depending on preference

Answer: (B)

The most common hip used for a DXA (Dual-energy X-ray Absorptiometry) scan of the proximal femur is the left hip. This preference is primarily due to standardization in imaging protocols, which helps ensure consistency in dosimetry and comparative analysis across different patients and studies.

Using the left hip for the scan allows for a uniform approach that many practitioners adopt. This is particularly important when assessing bone mineral density (BMD) across populations, as it enables more straightforward comparisons and reduces variability attributed to anatomical differences. Although technically both hips can provide accurate measurements, using the left hip has become an established convention within the clinical environment, leading many practices to routinely scan this site.

In contrast, the right hip is not typically avoided outright; however, the standardization around the left hip means that this is the choice most often reflected in guidelines and recommendations. The options suggesting a dominant hip or permitting a choice based on personal preference contribute to inconsistency, which can hinder the comparability of results over time and within different patient cohorts. This convention helps streamline the data collection process and supports the clinical assessment of osteoporosis and fracture risk more effectively.