A standing AP and lateral knee X‑ray are two weight‑bearing radiographs used to assess knee alignment, joint space, cartilage loss, arthritis, deformity and fractures. The standing AP (anteroposterior) view images the knee front-to-back while the lateral view captures the side profile. Weight-bearing images better show joint space narrowing under load. The test is quick and uses low-dose radiation.

Knee joint AP is an anteroposterior X‑ray projection that images the knee from front to back. It shows the distal femur, proximal tibia, fibular head and the joint space, helping assess fractures, bone alignment, arthritis-related joint‑space narrowing and bony lesions. It can be taken weight‑bearing or non‑weight‑bearing and is usually paired with a lateral view.

A standing weight-bearing knee X-ray is used to assess joint space narrowing and cartilage loss in osteoarthritis, show bone spurs (osteophytes), subchondral sclerosis, and bone alignment (varus/valgus deformity). It helps detect fractures, loose bodies, and assess prosthesis position, and is useful for surgical planning and monitoring progression because weight-bearing views reveal collapse and deformity not seen on non-weight-bearing films.

A standing AP is an anteroposterior radiographic view taken with the patient standing and bearing weight. The X‑ray beam passes from front to back, showing joint alignment and joint space under physiological load. It’s commonly used for knees, hips, pelvis and spine to detect degenerative changes, deformities or instability that may be missed on non–weight-bearing views, aiding diagnosis and treatment planning.

In X-ray imaging, AP stands for Anteroposterior. It means the X-ray beam enters the front (anterior) of the body and exits through the back (posterior). AP views are often used when patients are supine or cannot stand. AP versus PA positioning affects image projection and can enlarge structures (e.g., cardiac silhouette), so interpretation must consider the projection used.

Cost of a knee X‑ray varies by country and provider. On public healthcare systems it’s usually free for eligible patients. Private fees commonly range about $50–$300 in the US for one or two views; specialist or hospital billing can reach $300–$500+. In India private clinics often charge roughly ₹200–₹1,000. Additional radiologist reporting or urgent/emergency fees may raise the total.