What is the best way to determine a true lateral projection of the knee?

What is the best way to determine a true lateral projection of the knee?

• A. Femoral condyles superimposed
• B. Knee is flexed 90
• C. Malleoli on same transverse plane
• D. Intercondylar fossa is superimposed

Answer: (A)

To get a true lateral knee projection, the knee must be positioned so there is no rotation about the leg, and the femoral condyles should be overlapped. This condylar superimposition shows that the distal femur and proximal tibia are in the same plane, allowing accurate assessment of the joint space and surrounding structures. The knee is usually flexed only about 20–30 degrees for a true lateral view; bending to 90 degrees changes the projection and reduces the likelihood of proper condylar overlap. The other statements don’t define a true lateral: malleoli alignment refers to the ankle, not the knee, and while intercondylar fossa relationships can be assessed, the defining criterion for a true lateral knee is the superimposed femoral condyles.

To get a true lateral knee projection, the knee must be positioned so there is no rotation about the leg, and the femoral condyles should be overlapped. This condylar superimposition shows that the distal femur and proximal tibia are in the same plane, allowing accurate assessment of the joint space and surrounding structures. The knee is usually flexed only about 20–30 degrees for a true lateral view; bending to 90 degrees changes the projection and reduces the likelihood of proper condylar overlap. The other statements don’t define a true lateral: malleoli alignment refers to the ankle, not the knee, and while intercondylar fossa relationships can be assessed, the defining criterion for a true lateral knee is the superimposed femoral condyles.