Exam 9: Lumbar Spine, Sacrum, and Coccyx

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The radiographic appearance on an oblique lumbar spine in which the neck of the Scottie dog appears broken suggests the presence of:

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D

A radiograph of an AP axial sacrum reveals that it is foreshortened and the sacral foramina are not clearly seen.The patient was in an AP supine position, and the technologist angled the CR 5° to 7° cephalad.What specific positioning error is present on this radiograph?

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C

The "nose" of the Scottie dog represents the spinous process of a lumbar vertebra.

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False

A radiograph of an AP axial L5-S1 projection reveals that the joint space is not open.The following factors were used on this female patient: 80 kV, 40-inch (102-cm) SID, grid, 35° caudad angle, and CR centered to the ASIS.Which of the following factors needs to be modified to produce a more diagnostic image?

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An average of ____ segment(s) make up the adult coccyx.

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The second projection for the Ferguson method of the scoliosis series requires that the concave side of the curve be built up 3 to 4 inches (8 to 10 cm) by placing blocks beneath the patient's foot.

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If the waist is supported properly, an average-size patient does not require any CR angulation for the lateral lumbar spine projection.

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Which labeled structure in the figure is the superior articular process? Which labeled structure in the figure is the superior articular process?

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A radiograph of a left posterior oblique (LPO) projection of the lumbar spine reveals that the downside pedicle is projected too far posterior on the vertebral body.What specific positioning error is present on this radiograph?

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Why should the hips and knees be flexed for an anteroposterior (AP) projection of the lumbar spine?

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What is the joint classification of the zygapophyseal joints?

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Bone densitometry produces very little skin dose to the patient.

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The average degree of rotation required to demonstrate the L3-4 zygapophyseal joints is:

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Which of the following is a condition of unknown cause in which calcification of bony ridges between vertebrae occurs, creating a lack of mobility with a "bamboo" appearance?

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What CR angle should be used for a lateral sacrum/coccyx projection?

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Which of the following fractures is due to a hyperflexion force injury?

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Which labeled structure is the pars interarticularis? Which labeled structure is the pars interarticularis?

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The AP and lateral projections for a pediatric scoliosis study should include the entire lumbar and thoracic spine.

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Which aspect of the Scottie dog is the transverse process? Which aspect of the Scottie dog is the transverse process?    Which aspect of the Scottie dog is the transverse process?

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The zygapophyseal joints of the upper lumbar vertebrae are ____ in relationship to the midsagittal plane.

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