Pqct group 281-29%282%29

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Information about Pqct group 281-29%282%29
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Published on March 10, 2014

Author: YinglingV

Source: slideshare.net

Use and Bi-lateral comparison of radius bone strength

 Determining the strength of a bone used to be done by simply measuring the Bone Mineral Density (BMD)  However has been expanded upon in resent years to include more variables looking at not only the density but the distribution and quality of the bone

New ways to find bone strength The use of the computed tomography has given us the ability to look at other things besides BMD  bone shape  muscle  adipose By combining these numbers along with the BMD we can get a better sense of the strength of the bone.

 To measure just the BMD, the DEXA scan was used  However this does not provide a full picture of the mechanical strength of the bone  However BMD along with other factors can be used to determine bone strength much more accurately.

 Dual Energy X-ray Absorptiometry  This machine uses two x-ray beams set at two different energy levels  By measuring the amount of the beam that pass through the bone, BMD can be calculated

 Provides a cross sectional “slice” picture of the bone, and at multiple locations if needed  Provides a more detailed picture of the bone being scanned  Allows clinicians to measure different parts of the make up of the bone.

Dexa Pro Dexa Con  Quick  Non-invasive  Can scan difficult areas(hip and spine)  Low dose of radiation  Planar view  Can only find BMD  Large equipment size  Can not measure collagen in bone

Pro Cons  Provides a cross sectional picture and data of bone  The best way to measure bone strength of appendages  Offers a look at make up of bone sections(cortical vs trabecular)  Can only estimate at BMD due to low spacial resolution  Can not measure the collagen content of bone  Cannot scan axial skeleton

• Know anatomical landmarks to measure object length • Obtain patient’s medical history before scan • Make sure patient is positioned properly and is comfortable

• Input patient information • Select measurement mask • Run scout scan • Run measurement mask • Organize Data Analysis • Print results

 To scan both dominate and non-dominate forearms  We hypothesized that there would be a significant difference in the bone strength, density and area  The null being that there would be no difference

1000 1020 1040 1060 1080 1100 1120 1140 1160 1180 Average Cortical Density Cortical Density Left Arm Right Arm

94 95 96 97 98 99 100 101 102 103 104 Average Cortical Area Cortical Area Left Arm Area Right Arm Area

295 300 305 310 315 320 325 330 335 340 Average Strength Strength Left Arm Strength Right Arm Strength

560 580 600 620 640 660 680 X Axis Fracture Load Average X Axis Fracture Load Left Arm Right Arm

730 740 750 760 770 780 790 800 810 820 830 Y Axis Fracture Load Average Y Axis Fracture Load Left Arm Right Arm

 T-Test Significance Between Right and Left Arm  <0.05 = There is Significant Difference Between Right and Left Arm T-test Strength: 0.041 T-test Density: 0.623 T-test Area: 0.019 FX load X: 0.014 Fx load Y: 0.027

 We were limited in our study by the amount of time we had to work with the PQCT  We were also limited by the schedules that we each had  We also figured out a little too late that the calibrations contained the standard deviations for the errors in scanning

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