Prediction of Bone Mineral Density of Lumbar Spine,
Hip, Femoral Neck and Ward's Triangle by Forearm
Bone Mineral Density
WANNA TRIVITA Y ARATANA, M.D.*,
PIC HIT TRIVITAY ARAT ANA, M.Sc. *,
SURASAK KONGKIATIKUL, M.Sc.**
Affiliation : *Department of Radiological Technology, Faculty of Medical Technology, Mahidol University, Bangkok 10700,
** Department of Medical Services, Ministry of Public Health, Nonthaburi II 000, Thailand.
AbstractBone mineral density (BMD) of dual energy X-ray absorptiometry (DEXA) at both
radius and ulna were measured to evaluate the correlation of those and BMD at lumbar
(L) spine, hip, femoral neck and Ward's triangle. The 64 simple linear regression
analysis was calculated to postulate the predicted equation by using the BMD at
supradistal, distal 1110, distal 116 and distal 113 of both forearms as independent variables,
while the dependent variables were BMD at Ll-L4 spine, total hip, femoral neck and Ward's
triangle. 115 patients aged between 41-79 years (mean age 55.97±8.34 years) from the
menopausal clinic, Pramongkutklao Hospital, were scanned at both forearms by Panasonic
(DXA-70) DEXA and at non forearm regions by Hologic (QDR 4500) DEXA on the same
day. The results showed that the BMD of each of the 4 parts of both radius and ulna had
positive correlation to those of L-spine, total hip, femoral neck and Ward's triangle
with r 0.4012 to 0.7032 (P<0.001 for all). The greater distal of the forearm, the better
correlation of BMD to the non forearm BMD. The 64 simple linear regression equations
were constructed with regression coefficient ranging from 0.6048 to 1.9011 (P<0.001
for all). When considering the non forearm BMD, the mean BMD at Ward's triangle
significantly declined more rapidly than that of L-spine, total hip and femoral neck
(P<0.05 for all). It indicated that there was an early change of BMD at Ward's triangle.
However, this change followed the forearm BMD. Distal forearm BMD was the earliest
sign of bone loss. We can predict non forearm BMD by supradistal and distal 1110 of
forearm BMD.
Keywords : Prediction, Bone Density
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