Knee AP view

Clinical indication:

Trauma, pain, patella tenderness, patient is unable to weight bearing, suspected osteoarthritis, joint effusion, injection.

Region:

Knee joint

Patient’s Position:

The patient is placed in supine position. Make sure that there is no rotation of the pelvis.

Place the cassette under the patient’s knee.

Flex the joint slightly.

As the patient extends the knee center the cassette about half inch below the apex of patella.

Adjust the leg in true AP position.

The patella is slightly off center to the medial side.

Cassette:

Size: 8’’x10’’ Orientation: Portrait

FFD/SID:

100cm

Central ray:

Center of the knee 1.5cm distal to the patella apex and may be directed perpendicular to the joint.

Grid:

No

Respiration:

Not related.

Exposure factors:

60-70kVp 7-10mAs

Collimation:

Collimate laterally to the skin margins, superiorly to the distal femur, inferiorly to the proximal tibia-fibula and medially include the medial skin margin.

Knee AP view
Knee AP view

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