What it is (overview)

A Pelvis X-Ray AP View (anteroposterior view) is a common radiology imaging test that takes a single, front-facing X-ray image of your pelvis. “AP” means the X-ray beam passes from the front (anterior) of your body to the back (posterior). This view typically includes the pelvic bones (ilium, ischium, and pubis), the sacroiliac joints, the pubic symphysis, and often the upper parts of the hip joints and femoral heads.

The test does not “measure” a lab value like blood work. Instead, it creates an image that helps a radiologist and your clinician evaluate bone alignment, joint spaces, bone density appearance, and signs of injury or disease. It is frequently used in orthopedic evaluation for hip pain, suspected bone fracture, and trauma assessment after falls or accidents.

What results can mean: A normal pelvis X-ray shows intact pelvic bones with normal alignment and joint spacing. Abnormal results may show a fracture (a break or crack), dislocation (bones out of position), signs of arthritis (narrowed joint space, bone spurs), or other pelvic abnormalities such as bone lesions or changes suggesting inflammation or infection. Sometimes an X-ray can be normal even when pain is present—certain fractures (especially small or stress fractures) and soft-tissue problems may require further imaging such as CT or MRI.

When & why it's usually done

Clinicians commonly order a Pelvis X-Ray AP View when symptoms or circumstances suggest a problem involving the pelvis or hips. It is often one of the first imaging tests used because it is quick, widely available, and helpful for identifying many urgent bone injuries.

This test is typically done to:

Evaluate injury after trauma: Falls, sports injuries, workplace accidents, or motor vehicle collisions can cause pelvic or hip fractures. A pelvis X-ray is a standard part of trauma assessment when there is pelvic pain, difficulty standing, leg positioning changes, or concern for internal injury related to pelvic fractures.

Assess hip pain and mobility problems: Ongoing hip pain, groin pain, stiffness, reduced range of motion, or limping may prompt an X-ray to look for osteoarthritis, abnormal bone shape, or other structural causes.

Check for degenerative or inflammatory joint disease: If symptoms suggest arthritis (pain with activity, morning stiffness, reduced movement), an AP pelvis X-ray can show joint-space narrowing, osteophytes (bone spurs), and other changes used to diagnose and monitor disease.

Investigate suspected pelvic abnormalities: Your clinician may order this imaging test to evaluate suspected bone lesions, bone tumors, infection, or unusual findings on a prior scan.

Support pre- and post-treatment planning: Orthopedic specialists may use pelvis X-rays to plan treatment (such as surgery) and to follow healing after a fracture, hip replacement, or other procedures.

Common diseases related to it

• Pelvic fractures (including pubic rami fractures) after falls or high-impact trauma
• Hip fracture (especially in older adults after a fall)
• Hip dislocation or pelvic ring disruption
• Osteoarthritis of the hip (degenerative joint disease)
• Inflammatory arthritis affecting the pelvis/hips (e.g., ankylosing spondylitis with sacroiliitis)
• Avascular necrosis (osteonecrosis) of the femoral head (may be suggested on X-ray; MRI often confirms)
• Bone tumors or bone lesions (benign or malignant) involving pelvic bones
• Osteomyelitis (bone infection) or septic arthritis (may show later changes on X-ray)
• Hip dysplasia or structural hip abnormalities (often identified with additional views)
• Osteoporosis-related insufficiency fractures (may be subtle early)

Health goals where it may help

• Finding the cause of hip, groin, or pelvic pain to guide safe treatment and pain relief
• Rapid detection of fractures after trauma to support timely orthopedic care
• Monitoring bone and joint degeneration (such as hip osteoarthritis) to support mobility and quality of life
• Evaluating recovery and alignment after orthopedic procedures (e.g., fracture repair or hip replacement follow-up)
• Identifying structural pelvic or hip abnormalities that may affect gait, balance, or daily function
• Supporting bone-health goals by detecting fracture patterns that may prompt osteoporosis evaluation and prevention planning