The effect of hip rotation on bone mineral density of the proximal femur measured by dual energy X-ray absorptiometry proximal femur measured by dual energy X-ray absorptiometry
Özgür Çelik1, Yaşar Salcı2, Metin Manisalı3, Feza Korkusuz
1Department of Physical Education and Sport, Faculty of Education, Middle East Technical University, Ankara, Turkey
2Department of Radiology, Medicine Faculty of Dokuz Eylül University, İzmir, Turkey
3Middle East Technical University, Medical Center, Ankara, Turkey
Keywords: Key words: Densitometry; hip fractures; osteoporosis; risk factors.
Objectives: The aim of this study was to compare the effect of lower extremity position changes on hip bone mineral density measured by dual energy X-ray absorptiometry.
Patients and methods: Sixty-nine healthy university students (30 men, 39 women; mean age 21.9±1.6; range 20 to 25 years) participated in this study. Participants were evaluated in two groups as male and female. A special positioning device was produced and used during bone mineral density measurements. Measurements were performed in positions of external 30°, external 15°, neutral 0°, internal 15°, and internal 30° of hip rotations. Measurements were evaluated at shaft, wards and trochanteric region of proximal femur. Differences between positions at shaft, wards, trochanter and total values were compared using repeated measures of analysis of variance.
Results: External rotation significantly increased bone mineral density values measured by dual energy X-ray absorptiometry in both male and female. The lowest bone mineral density value was measured at 30° internal rotation in both sexes. There were slight differences between neutral, 15° and 30° internal rotation positions, but these differences were not statistically significant.
Conclusion: Our findings suggest that position differences are important in adult healthy male and female during bone mineral density measurements of proximal femur using dual energy X-ray absorptiometry.