An X‑ray scanogram of both lower limbs is a specialized radiographic technique that produces calibrated full‑length images of the femur and tibia to accurately measure leg‑length and alignment. It uses aligned exposures and calibration markers to reduce magnification and radiation dose. Clinically it evaluates limb‑length discrepancy, growth abnormalities, deformity assessment, and preoperative planning for corrective orthopaedic procedures.

A CT scanogram of the lower limbs is a low-dose CT technique that produces calibrated long-leg images for accurate measurement of bone lengths and mechanical alignment. It’s used to assess leg-length discrepancy, joint deformities and plan surgeries (osteotomy or arthroplasty). The test is quick, noninvasive and gives more precise, reproducible measurements than standard X-rays, with careful radiation-dose control.

Radiological assessment of lower-limb alignment uses weight-bearing, full-length AP (long-leg) radiographs to measure the mechanical axis (line from hip center to ankle center) and hip–knee–ankle (HKA) angle, quantifying varus or valgus deformity and joint-line orientation. Supplementary lateral views assess sagittal alignment; CT or EOS imaging evaluates femoral/tibial torsion when rotational deformity is suspected. Measurements guide treatment and surgical planning.

Normal lower-limb alignment shows the mechanical axis running from the femoral head center through the knee center to the ankle center, producing a slight physiological valgus at the knee (~5–7° tibiofemoral angle). Hip neck–shaft angle is about 120–135° with femoral anteversion ~10–15°. Knee joint lines are roughly perpendicular to the mechanical axis. Tibial torsion (external) is normally around 10–20°, aligning ankle and foot.

Scanogram costs vary by country and facility. Typical ranges: India ₹300–1,500; United Kingdom (private) £50–200; United States $100–400. Hospital radiology departments, private diagnostic centers, and whether consultation or special imaging are included affect price. Public systems often provide it free to eligible patients; insurance may cover part of private costs. Always check local centers for exact fees and pre-authorization.

You’ll change into a gown and remove metal. The technologist will position you (lying or standing) and place a scale marker; several quick X‑ray exposures are taken from hip, knee and ankle to measure length and alignment. The technologist may leave the room briefly and ask you to remain still. The scan is painless, takes about 10–20 minutes, uses low radiation, and a radiologist will report results.