9/20: Set 2 — Sacrum, Coccyx & SI Joint Positioning

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Last updated 12:26 AM on 9/21/26
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34 Terms

1
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Which routine projections are used for the sacrum?
AP axial and lateral projections.
2
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Which routine projections are used for the coccyx?
AP axial and lateral projections.
3
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What SID is commonly used for sacrum and coccyx radiography?
40 inches.
4
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What patient position is used for an AP axial sacrum?
Supine.
5
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What CR angle is used for an AP axial sacrum?
Approximately 15° cephalad.
6
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Where is the CR centered for an AP axial sacrum?
At the MSP approximately 2 inches superior to the pubic symphysis.
7
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Why is a cephalad CR angle used for the AP axial sacrum?
To reduce foreshortening and better demonstrate the angled sacrum.
8
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What respiration instruction is used for an AP axial sacrum?
Suspend respiration.
9
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What anatomy should be demonstrated on an AP axial sacrum?
The entire sacrum, including the sacral foramina and lumbosacral region.
10
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How should the sacrum appear on a properly positioned AP axial image?
It should be demonstrated with minimal foreshortening.
11
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What patient position is used for a lateral sacrum?
Lateral recumbent.
12
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What CR angulation is used for a lateral sacrum?
Perpendicular to the IR.
13
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What anatomy should be demonstrated on a lateral sacrum?
The sacrum in lateral profile and the lumbosacral and sacrococcygeal regions.
14
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What evaluation finding helps indicate a true lateral sacrum?
The greater sciatic notches should be closely superimposed.
15
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What CR angle is used for an AP axial coccyx?
Approximately 10° caudad.
16
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What patient position is used for an AP axial coccyx?
Supine.
17
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Where is the CR centered for an AP axial coccyx?
At the MSP approximately 2 inches superior to the pubic symphysis.
18
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Why is a caudal CR angle used for the AP axial coccyx?
To project the coccyx free of superimposition by the pubic symphysis.
19
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Where should the coccyx appear in relation to the pubic symphysis on a properly positioned AP axial image?
The coccyx should be projected superior to and free of the pubic symphysis.
20
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What should be demonstrated on an AP axial coccyx image?
The coccyx, distal sacrum, and sacrococcygeal region.
21
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What patient position is used for a lateral coccyx?
Lateral recumbent.
22
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What CR angulation is used for a lateral coccyx?
Perpendicular to the IR.
23
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What anatomy should be demonstrated on a lateral coccyx?
The entire coccyx and sacrococcygeal joint in lateral profile.
24
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What is the easiest way to remember the AP axial sacrum and coccyx CR directions?
Sacrum = 15° cephalad; coccyx = 10° caudad.
25
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Which SI joint is demonstrated on a posterior oblique position?
The SI joint farthest from the IR.
26
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Which SI joint is demonstrated in an RPO position?
The left SI joint.
27
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Which SI joint is demonstrated in an LPO position?
The right SI joint.
28
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What is the posterior-oblique SI joint side rule?
Posterior obliques demonstrate the SI joint farthest from the IR.
29
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What should the SI joint of interest look like on a correctly positioned oblique image?
The joint space should appear open with minimal superimposition of the sacrum and ilium.
30
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Which bones should have minimal superimposition at the SI joint of interest?
The sacrum and ilium.
31
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What is the primary purpose of an SI joint oblique projection?
To demonstrate one SI joint open and free of excessive superimposition.
32
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AP axial SI joints — male CR angle
30° cephalad
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AP axial SI joints — female CR angle
35° cephalad
34
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AP axial SI joints — centering
2 inches below the level of the ASIS, centered to the MSP