Bone Densitometry in Clinical Practice Application and by Sydney Lou Bonnick

By Sydney Lou Bonnick

A thought-provoking publication in regards to the way forward for bone and joint problems. this is often the last decade of Bone and Joint, a time the place quick advancements in our figuring out of those issues deal with significant raises in those power stipulations through the global. by means of drawing on present wisdom and services, the booklet considers destiny eventualities reminiscent of the advance of medical theories, know-how, prevention, prognosis and therapy.

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Total body studies required 20 minutes in the medium scan mode and only 10 minutes in the fast scan mode. Newer DXA units scan even faster, with studies of the PA spine or proximal femur requiring less than 1 minute to perform. The values obtained with DXA studies of the skeleton are highly correlated with values from earlier studies performed with DPA. Consequently, the accuracy of DXA is consid8 A central device is a bone densitometer that can be used to quantify bone density in the spine and proximal femur.

Results were reported as either bone mineral content (BMC) in grams or as BMC per unit length (BMD/l) in grams per centimeter. The time required to perform such studies was approximately 10 minutes (35). SPA is rarely performed today, having been supplanted first by single-energy X-ray absorptiometry (SXA) and now DXA. The demise of SPA was due to improvements in ease of use and precision seen with SXA and DXA. SPA was an accurate technology that could be used to predict fracture risk. The ability to predict the risk of appendicular fractures with SPA measurements of the radius was convincingly established (36–38).

73). In an attempt to eliminate the error introduced by marrow fat, dual-energy QCT (DEQCT) was developed by Genant and Boyd (74). 4% in cadaveric studies (71,72). In vivo, the accuracy with DEQCT is 3 to 6% (35,70). Radiation dose with DEQCT is increased approximately 10-fold compared to regular or single-energy QCT (SEQCT) and precision is not as good. The precision of SEQCT for vertebral measurements in expert hands is 1 to 3% and for DEQCT, 3 to 5% (70,75). The measurement of bone density in the proximal femur with QCT is not readily available.

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