What does an X-ray series of the lower extremities typically include?

An X-ray series of the lower extremities typically includes specific imaging views that allow for comprehensive evaluation of the major bones and joints in the legs. The correct answer focuses on common practice in medical imaging, which consists of obtaining anteroposterior (AP) and lateral views of the femur, knee, and ankle.

The AP view provides a front-to-back perspective, which is useful for assessing the alignment, joint space, and bone structure for these areas. The lateral view adds a side perspective, which is crucial for visualizing the depth and any displacement of fractures that might not be evident from the front view alone. This combination of views is standard for assessing fractures, dislocations, and degenerative changes in the lower extremities.

The other options do not represent a typical X-ray series of the lower extremities. An X-ray of the spine and pelvis does not focus specifically on the legs, while a CT scan of the lower back and legs and an MRI of the knees and ankles are advanced imaging modalities used for different diagnostic purposes and are not part of a standard X-ray series.