Knee Study

AP Projection

1. Patient in supine;
2. Leg in extension and in slightly medial rotation at 15º.

Central ray perpendicular to 2 cm below the apice of the patella.

Evaluation criteria:

• Visualization of the open femorotibial joints space;
• Tibia and fibula moderately overlapped in the proximal level;
• Patella completely superimposed on the femur;
• Appropriate exposure values (visualization of the all bony trabeculation and soft tissue).

Lateral Projection

1. Patient in supine;
2. turn toward the affected side until it is in lateral position;
3. flexion of the knee at 30º;

Central ray angle of  5-10º cephalic, to 2 cm posterior of the apice of the patella.

Evaluation Criteria:

• Femoral condyles superimposed;
• Open joint spaces between femoral condyles and tibia;
• Knee flexed;
• Patella in profile;
• Fibular head and tibia slightly superimposed;
• Appropriate exposure values (visualization of the all bony trabeculation and soft tissue).