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KMID : 0357520080310010025
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Journal of Radiological Science and Technology
2008 Volume.31 No. 1 p.25 ~ p.31
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The Study of Diagnostic Results Discordance Analysis on BMD Using DEXA
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Park Won-Kyu
Kang Young-Han
Cho Kwang-Ho
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Abstract
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Purpose: This study was conducted to understand for the diagnostic discordance of bone mineral density(BMD) in DEXA(Dual Energy X-ray Absorptiometry). And the diagnostic difference between lumbar spine and femur neck, forearm was evaluated using T-score.
Materials and Methods : We studied 220 females measured BMD on lumbar spine, and femur neck, forearm including ward’s triangle and ultra digital(UD). We were distinguished T-score into normal, osteopenia, osteoporosis(WHO classification) and evaluated discordance rate according to age and degree of bone loss. Correlation analysis and chi-square test between L-spine, L-4, femur neck, Ward, Forearm, UD were carried out.
Results: In the lumbar spine, the number of normal were in 57(25.9%), osteopenia in 86(39.1%), osteoporosis in 77(35.0%). In the L-4 and ward’s triangle, the number of osteoporosis were in 78(35.5%), in 126(57.3%). There was significant correlation between lumbar, femur neck and forearm BMD in all cases. The discordance of BMD between lumbar and femur were 57%, lumbar and forearm 43%, forearm and femur 51%. The discordance rates of normal, osteopenic, osteoporotic groups were 39%, 64%, 43%, respectively, showing the highest discordance rate in osteopenia patients. In normal group of lumbar spine, the discordance rate was 25%, 23%, 11%, 65%, 86% in 30’, 40’, 50’, 60’, 70’, respectively. In osteopenia, osteoporosis group of lumbar spine, the discordance rate was 62%, 55%, 36%, 20%, 9% in 30’, 40’, 50’, 60’, 70’, respectively.
Conclusion: It was different of the results of BMD with lumbar, femur and forearm site. The discordance rate was decreased with age in osteopenia, osteoporosis lumbar spine. In osteopenia group, the discordance rate was the highest. So, it is necessary that the BMD of lumbar, femur neck and forearm should be checked.
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KEYWORD
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DEXA, BMD Discordance, Osteopenia, Osteoporosis
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