Evaulation Criteria SI Joints, Sacrum And Coccyx

Question 1

AP/PA axial SI joint evaluation criteria

Answer 1

• SI joints and L5/S1
• no rotation or tilt
• spinous processes centered
• symmetrical sacral alae
• open S5, L1
• open SI joints
• symphysis pubis will superimpose sacrum as it will have been thrown superiorly by the 35 degree cephalad angle

Question 2

AP bilateral obliques evaluation criteria

Answer 2

Open SI joint

Question 3

Routine protocol sacrum and coccyx

Answer 3

• 15 degree AP axial sacrum
• 10 degree AP axial coccyx
• lateral sacrum and coccyx

Question 4

Evaluation criteria sacrum

Answer 4

• sacrum without foreshortening
• closed SI and LS/S1 joints
• pubic bones not overlapping the sacrum
• fecal material not overlapping the sacrum
• no rotation

Question 5

Evaluation criteria AP axial sacrum

Answer 5

• coccyx entered and free of superimposition
• tight collimation
• no rotation

Question 6

Evaluation criteria for sacrum and coccyx lateral

Answer 6

• entire sacrum, coccyx, and L5/S1 joint

- no rotation indicated by superimposed greater sciatic notches and femoral heads

Question 7

True/ false: if the coccyx is over-exposed, it will need to be taken on its own

Answer 7

True