How are intervertebral disc spaces assessed radiographically?

• A. Identify fracture lines in pedicles.
• B. Look for uniform height and endplate alignment; detect narrowing or irregularities indicating degenerative disease.
• C. Measure vertebral body height only.
• D. Assess calcifications in the disc space.

Answer: (B)

Assess intervertebral disc spaces by examining the height of the spaces between adjacent vertebral bodies and the alignment of the endplates. A healthy disc produces a uniform, consistent space with endplates that line up smoothly. When degeneration occurs, the disc spaces narrow and the endplates can become irregular, sometimes with osteophyte formation or other signs of spondylosis. This pattern—uniform height with potential narrowing and endplate changes—most directly reflects disc health on radiographs. Fracture lines in the pedicles concern the vertebral arches rather than the discs, measuring vertebral body height alone misses disc-space status, and disc-space calcifications are not the standard method for assessing disc integrity (though they can appear in certain conditions).