To correct a knee lateral view where the condyle overlies the joint space due to misalignment, which parameter should be adjusted?

• A. X-ray tube angulation
• B. Lateral rotation of the knee
• C. Flexion of the knee
• D. Receptor position

Answer: (A)

In a knee lateral view, you want the femoral condyles to be superimposed and the tibiofemoral joint seen with minimal distortion. If the condyle seems to overlie the joint space, the projection is off because the beam is not aligned with the knee’s anatomy. The most effective fix is to adjust the X-ray tube angulation. By changing the angle of the central ray, you realign the projection with the knee’s axis, reducing parallax and distortion so the condyles sit correctly over the joint space. This correction addresses the misalignment at the source—the projection geometry—without necessarily altering how the knee is positioned on the table. Receptor position and knee flexion can help with other issues, but for this specific misalignment, altering tube angulation provides the needed correction.