Standing AP (weight-bearing) knee: patient stands facing the detector with equal weight on both legs, knees fully extended and patellae pointing straight ahead. Avoid limb rotation. Center the image receptor at the knee joint—about 1.3 cm (½ inch) below the patellar apex—and direct the x‑ray beam perpendicular to the joint. Include both knees and distal femora.

An AP (anteroposterior) knee X‑ray is a front‑to‑back radiographic view that images the femur, tibia, and knee joint. It assesses bone alignment, joint space, fractures, arthritis, and degenerative changes. Typically taken standing (weight‑bearing) or supine with the knee extended; often combined with lateral and skyline views. It’s quick, noninvasive, and uses low‑dose radiation.

A standing AP and lateral view are two radiographic projections taken with the patient upright. AP (anteroposterior) means the X‑ray beam passes from front to back, producing a frontal image; the lateral view is a side‑to‑side projection. Together they assess lung fields, heart size, pleural effusions, air‑fluid levels and spinal alignment; standing positioning helps evaluate gravity‑dependent findings and respiratory mechanics.

A standing (weight-bearing) knee X-ray evaluates how the knee bears load, helping diagnose and grade osteoarthritis by showing joint‑space narrowing, cartilage loss, osteophytes, subchondral sclerosis, and alignment abnormalities (varus/valgus). It also aids detection of fractures, joint incongruity, progression of degenerative change, and is used for preoperative planning and assessing deformity or limb‑alignment for treatment decisions.

Stand with knees soft — not locked or hyperextended — aligned over hips and ankles and pointing forward. Distribute weight evenly through both feet, feet hip-width apart. Avoid inward collapse or excessive sway; engage quads and glutes slightly to support the joint. Maintain a neutral pelvis and upright posture to reduce strain on knees and surrounding ligaments.

The figure‑4 knee position places one ankle across the opposite thigh just above the knee so the legs form a “4.” Clinically it’s used in hip and sacroiliac assessment (FABER/Patrick test) and as a common stretch targeting the piriformis and gluteal muscles. It helps reproduce hip or buttock pain and assess external rotation and hip flexibility.