Measurements of bone mineral density of the proximal femur by two commercially available dual energy X-ray absorptiometric systems.

摘要: Two dual energy X-ray absorptiometric (DXA) instruments have recently become commercially available for local bone densitometry: the QDR-1000 (Hologic Inc.) and DPX (Lunar Radiation Corp.). We report precision, influence of femoral rotation, correlation agreement mineral measurements proximal femur by these two instruments. In vitro (femur phantom) short-term precision was 1.1%–3.5%, long-term 1.2%–3.8%. vivo (groups 10 premenopausal postmenopausal women) duplicate 1.6%–4.7%, 1.9%–5.5%. Overall, Ward's triangle over 3% that neck trochanter, 2%–3%. Rotation a phantom produced statistically significant change in density (BMD) neck. Within clinically relevant range rotation (20° inward ±5°) coefficient variation (CV%) increased mean factor 1.1–1.4. Although (r < 0.9) between BMD 30 women high, there lack found no differences right left women. A bilateral scan took total time about 22 min. conclude with introduction DXA instruments, has improved. However, comparability it might be advantageous if units were standardized.