Sacrum, Coccyx, and SI Joints

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Last updated 1:58 PM on 7/8/26
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130 Terms

1
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base

1

<p>1 </p>
2
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sacral ala

2

<p>2</p>
3
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sacral promontory

3

<p>3</p>
4
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sacral foramen

4

<p>4</p>
5
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transverse lines

5

<p>5</p>
6
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apex

6

<p>6</p>
7
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coccyx

7

<p>7</p>
8
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inferior lateral angle

8

<p>8</p>
9
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superior articular process

9

<p>9</p>
10
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superior articular facet

10

<p>10</p>
11
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sacral canal

11

<p>11</p>
12
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sacral tuberosity

12

<p>12</p>
13
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articular surface

13

<p>13</p>
14
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lateral sacral crest

14

<p>14</p>
15
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Intermediate sacral c

15

<p>15</p>
16
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Median sacral crest

16

<p>16</p>
17
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Sacral cornu

17

<p>17</p>
18
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Sacral hiatus

18

<p>18</p>
19
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Sacral foramen

19

<p>19</p>
20
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5

sacrum is made of how many vertebral segments?

21
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sacral nerves and blood vessels

foramen carry what through sacrum?

22
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superior articular process

1

<p>1</p>
23
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base

2

<p>2</p>
24
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sacral foramina

3

<p>3</p>
25
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apex

4

<p>4</p>
26
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sacrum

5

<p>5</p>
27
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ilium

6

<p>6</p>
28
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SI joint

7

<p>7</p>
29
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base

1

<p>1</p>
30
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transverse process

2

<p>2</p>
31
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apex

3

<p>3</p>
32
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Co1

4

<p>4</p>
33
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Co2

5

<p>5</p>
34
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Co3

6

<p>6</p>
35
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Co4

7

<p>7</p>
36
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coccygeal cornua

8

<p>8</p>
37
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3-5

how many segments make up the coccyx?

38
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coccyx

gives stabilization while sitting

39
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superior articular process

1

<p>1</p>
40
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median sacral crest

2

<p>2</p>
41
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sacral cornu

3

<p>3</p>
42
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coccyx

4

<p>4</p>
43
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coccygeal cornu

5

<p>5</p>
44
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sacrum

6

<p>6</p>
45
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articular surface

7

<p>7</p>
46
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promontory

8

<p>8</p>
47
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base

9

<p>9</p>
48
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sacral canal

1

<p>1</p>
49
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median sacral crest

2

<p>2</p>
50
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sacral horn

3

<p>3</p>
51
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greater sciatic notch

4

<p>4</p>
52
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promontory

5

<p>5</p>
53
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sacroiliac joints

junction of iliac ala and sacral ala

54
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concave

sacral surface shape for SI joints

55
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convex

iliac surface shape for SI joints

56
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fibrous part of SI joint

1

<p>1</p>
57
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PSIS

2

<p>2</p>
58
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interosseous SI ligaments

3

<p>3</p>
59
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synovial part of SI joint

4

<p>4</p>
60
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anterior SI ligament

5

<p>5</p>
61
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synovial amphiarthrodial joint

SI joint type

62
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ligaments

superior portion of SI joints are connected by what?

63
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synovial joint

inferior portion of SI joint is?

64
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posteriorly and anteriorly

SI joint is angled?

65
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40

S1 degree

66
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25

S2 degree

67
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-10

S3 degree

68
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radiographic appearance of dislocated coccyx

transverse orientation or displacement of fracture fragment

69
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dislocated coccyx

what pathology is this?

<p>what pathology is this?</p>
70
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radiographic appearance of dislocated SI joint

misalignment of SI joints

71
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dislocated SI joint

what pathology is this?

<p>what pathology is this? </p>
72
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sacrum AP axial

Sacrum centered and seen in its entirety

Sacrum free of foreshortening, with the sacral curve straightened

Pubic bones not overlapping the sacrum

No rotation of the sacrum, as demonstrated by symmetric alae

73
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repeat → no tube angle

critique sacrum AP axial

<p>critique sacrum AP axial </p>
74
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repeat → too much tube angle

apex of sacrum covered by pubic bone

critique sacrum AP axial

<p>critique sacrum AP axial </p>
75
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good

critique sacrum AP axial

<p>critique sacrum AP axial </p>
76
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coccyx AP axial

Coccyx centered and seen in its entirety

Coccyx free of foreshortening, with the sacral curve straightened

Pubic bones not overlapping the Coccyx

No rotation of the Coccyx , as demonstrated by symmetric pelvis

77
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good even though slight rotation

critique coccyx AP axial

<p>critique coccyx AP axial </p>
78
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repeat → no tube angle

pubic bone over coccyx (pubic bone should look thin when there is an angle)

critique coccyx AP axial

<p>critique coccyx AP axial </p>
79
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good

critique for coccyx AP axial

<p>critique for coccyx AP axial </p>
80
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sacrum lateral

Sacrum

Closely superimposed posterior margins of the ischia and ilia, demonstrating no rotation

81
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good

centering is too superior and anterior

critique for sacrum lateral

<p>critique for sacrum lateral </p>
82
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repeat → rotation

acetabulums are off, sacral canal not open

critique for sacrum lateral

<p>critique for sacrum lateral </p>
83
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good

slight rotation

critique for sacrum lateral

<p>critique for sacrum lateral </p>
84
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coccyx lateral

Coccyx

Closely superimposed posterior margins of the ischia and ilia, demonstrating no rotation

Bony trabecular detail and surrounding soft tissues

85
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good

critique for coccyx lateral

<p>critique for coccyx lateral </p>
86
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good

critique for coccyx lateral

<p>critique for coccyx lateral </p>
87
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repeat → rotation

starting to superimpose coccyx

critique for coccyx lateral

<p>critique for coccyx lateral</p>
88
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SI joints AP axial

Lumbosacral junction and sacrum

Open intervertebral disk space between L5 and S1

Both sacroiliac joints

Central Ray angled

  • 30° cephalad angle for males

  • 35° cephalad angle for females

89
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repeat → too much angle

covering bottom of left SI joint

critique for SI joint AP axial

<p>critique for SI joint AP axial </p>
90
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good

critique for SI joint AP axial

<p>critique for SI joint AP axial </p>
91
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repeat → no tube angle

SI joints are seen but not elongated indicating no angle

critique for SI joint AP axial

<p>critique for SI joint AP axial </p>
92
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SI joint - RPO/ LPO

Open sacroiliac joint space furthest from the IR with minimal overlap of the ilium and sacrum

Joint centered on the radiograph

Appropriate right or left marker should be used to mark laterally on the elevated side.

93
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elevated

what side do you mark for RPO/LPO SI joints?

94
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good

critique for SI obliques

<p>critique for SI obliques </p>
95
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repeat → over rotated

joint closed/ covered

critique for SI obliques

<p>critique for SI obliques </p>
96
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repeat → under rotated

joint covered by ala

critique for SI obliques

<p>critique for SI obliques </p>
97
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good

critique for SI obliques

<p>critique for SI obliques </p>
98
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90 kVp 14 mAs

tech for sacrum AP

99
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center

cell for sacrum AP

100
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10×12

collimation for sacrum AP