Evaluation Criteria: Leg Length, Acetabulum, Inlet, Outlet

Question 1

What is used for finding limb length discrepancies?

Answer 1

Orthoroentgenography or Scanogram

Question 2

How many exposures are taken for upper or lower limb for measurement?

Answer 2

3 exposures

Question 3

What joints are imaged with Orthoroentgenography or Scanogram

Answer 3

-Hip, knee, angle joints
-Shoulder, elbow, wrist joints

Question 4

How many IRs are there for Orthoroentgenography
procedures

Answer 4

One single IR

Question 5

What type of IRs are used for Scanograms

Answer 5

Separate IR’s

Question 6

When you do bilateral leg discrepancy studies, what should be placed between the legs?

Answer 6

A ruler

Question 7

When taking leg discrepancy studies, what should your collimation, SID, and body position be?

Answer 7

-ASIS to ankles
-180cm-300cm
-Standing in anatomic position
-Shoes off, weight evenly distributed

Question 8

What type of IR does stitching of multiple images together?

Answer 8

DR

Question 9

What are the 2 types of image stitching?

Answer 9

Manual or automatic

Question 10

If the IR that you use for image stitching is an automatic, how should you position the patient, and how does the tube move?

Answer 10

Mark ASIS and ankles, hold exposure switch until all images are completed

Question 11

If the IR that you use for image stitching is manual, how should you position the patient, and how does the tube move?

Answer 11

Start at ASIS and the personally move the tube between exposures to the ankles

Question 12

What type of images are taken for lower and upper bone discrepancy exams in CT? What are the benefits?

Answer 12

Scout images
Benefits: Consistently reproduced and lower dose

Question 13

What should you see on a modified Judet Method-external rotation

Answer 13

• Ilioischial column
• Anterior rim of acetabulum
• Both of these are demonstrated for the side closest to the table
• Ilioischial line (posterior column)
• Anterior acetabular wall
• Roof of acetabulum
• Iliac crest

Question 14

What should you see on a Modified Judet Method Internal Rotation?

Answer 14

• Iliopubic Column
• Posterior rim of acetabulum
• Ischial tuberosity
• Greater and lesser siatic notch

Question 15

What should you see on an AP Axial Outlet – Taylor Method?

Answer 15

• Pubic and Ischial bones magnified
• Superior and inferior rami without foreshortening
• Pubic bones superimposed over sacrum and coccyx
• Symmetry

Question 16

What should you see on an AP Axial Inlet – Bridgeman Method?

Answer 16

• Axial projection of entire pelvic ring
• Pubic and ischial rami superimposed
• Symmetry