Bc P2 Bone Densitometry

Front 1

Densitometry was first depicted a century ago in:

Back 1

Dental radiography.

Front 2

Densitometry is principally a ----------- -------------- technique.

Back 2

Quantitive measurement.

Front 3

The quantity being measured is ------- or --------.

Back 3

Bone mass or density

Front 4

Bone densitometry can measure these three quantaties:

Back 4

BMD (g/cm^2)

BMC (g)

Area (cm^2)

Front 5

BMD

Back 5

Bone mineral density

Front 6

BMC

Back 6

Bone mineral content

Front 7

BMC is calculated by:

Back 7

BMD (g/cm^2) x Area (cm^2)=BMC (g)

Front 8

BMD measurements from DXA scanners are:

Back 8

Areal measurements (2 dimentionall

Front 9

BMD measurements are two dimensional due to:

Back 9

Bone size variation

Front 10

The quantities measured by bone densitometry doesn't reflect that you do or dont have bone loss. How do we get this information?

Back 10

Uses scanned values compared to database values and generates information that can be useful to a physician.

Front 11

Two types of comparisons are made and reported:

Back 11

T score and Z score

Front 12

T score

Back 12

Compares (%young adult) pt bmd values to the average peak of young adult.

Front 13

Z score

Back 13

Z score (% age matched) compares bmd scores to pt of similar age.

Front 14

T and z scores are standard scores. They are calculated:

Back 14

Specific value is the bmd and the mean is the calculated average of the reference database.

Front 15

Back 15

Remember BMC is bmd and area multiplied.

Front 16

Back 16

So means Stanford deviation.

Hint 16

Front 17

LSC:

Back 17

Least significant change- is the smallest change with BMD measured consecutively that is considered true change.(not chance or technical factors)

Front 18

LSC- if its withing the LFC established range it is:

Back 18

Differences due to technical factors.

Front 19

LSC above range:

Back 19

Result may be clinically significant.

Front 20

LSC is dependent on the:

Back 20

Precession rate or reproducibility

Front 21

Precision rate or reproducibility is calculated from:

Back 21

Differences between paired measurments taken from volunteers with no anatomical non comformaties.

Front 22

What is the best reason to utilize densentometry in medicine?

Back 22

Patient probability of fracture

Front 23

Absolute risk:

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Pts actual risk for fragility fracture

Front 24

Two modifier applied to absolute risk:

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Time frame

Type of fracture

Front 25

Most common time period for absolute risk fracture is:

Back 25

Ten years

Front 26

Absolute risk:Type of fracture CAN be specific to one site...often the -----.

Back 26

Proximal femure or can include any osteoporotic fracture.

Front 27

Which is superior....absolute risk predictions or relative risk predictions?

Back 27

Absolute risk.

Front 28

FRAX filter are in place because certain conditions make FRAC contraindicated....lost 4 reasons.

Back 28

Patients that are:

Under 50.

Osteoporotic t score

Prior spine or hip fracture

Treatment with bone active agent.

Front 29

What is FRAX?

Back 29

Risk prediction tool developed by WHO. Alogrithym that uses clinical risk factors(w or wo femoral neck bmd) to predict abosulte 10 yr risk factor.

Front 30

FRAX can be used to predict

Back 30

Hip fracture, or any major osteoporotic fracture at any site.

Front 31

FRAX can function as a standalone site but...

Back 31

Incorporated into most dxa software.

Front 32

FRAX is designed to use

Back 32

Use the bmd or t s ore of the femoral neck ONLY.

Front 33

Risk factors required by FRAX with or without bmd of femoral neck.

Back 33

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