A lateral sacrum and coccyx X‑ray is a side‑view radiograph focused on the lower spine’s sacrum and tailbone. It evaluates fractures, dislocations, degenerative changes, sacrococcygeal joint problems and causes of tailbone pain. The exam is quick, performed with the patient positioned sideways while the beam targets the sacrococcygeal area; preparation is minimal and radiation exposure is low.

The minimum two views for X‑ray of the sacrum and coccyx are anteroposterior (AP) and lateral projections. These complementary views assess alignment, fractures, and degenerative change; AP (often obtained as an axial AP for sacrum) shows curvature while the lateral demonstrates displacement or angulation. Additional oblique or dedicated axial views may be obtained if clinical suspicion persists.

Lateral positioning for a coccyx X-ray places the patient on their side so the X-ray beam passes laterally, creating a side‑on (profile) image of the coccyx and distal sacrum. This view best shows bony alignment, fractures, dislocations, angulation, and joint abnormalities or fragment displacement that can be missed on front‑to‑back (AP) images.

AP (anteroposterior) view means the X‑ray beam passes from the front through to the back of the body; it’s used when patients can’t stand and may magnify mediastinal structures. Lateral view is a side‑to‑side projection that shows depth and separates overlapping anatomy. Together they provide orthogonal perspectives to localize lesions, assess bone alignment, and evaluate chest or joint pathology.

Yes—X‑rays of the sacrum can detect many bony tumors or bone changes (lytic or sclerotic lesions) and large masses, but they have limitations: small lesions, early marrow involvement, and soft‑tissue tumors may be missed. If a tumor is suspected, MRI, CT, or bone scan provide greater sensitivity and detail for marrow and soft‑tissue involvement and are usually recommended.

A sacrum X‑ray is quick: the actual exposures last only seconds, while positioning and image checks usually take about 5–15 minutes. If multiple views or repeats are needed, the appointment may extend to 20–30 minutes. Expect a short wait and brief instructions from the radiographer; results are typically reported afterward and may take longer to reach your doctor.