AP KNEE , LATERAL KNEE AND SKYLINE(AXIAL PATELLA)

AP KNEE AND LATERAL KNEE

Ap knee – This position done to visualize Fractures, dislocations of the knee

Collimation- to include distal third of femur and proximal third of tibia and lateral and medial skin edge

Centering point – apex of patella

FFD- 100 cm  

Central ray – 5° -1°0 cranial angulation

Cassette orientation - portrait  or depend on patient

Protection – gonads shielding is advisable

Position of patient – the patient supine or seated on the table with leg staright and cassette placed under knee

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LATERAL KNEE

Lateral knee – This position done to visualize Fractures, dislocations of the knee

Collimation- to include distal third of femur and proximal third of tibia and anterior and posterior skin edge

Centering point – medial femoral condyle

FFD- 100 cm  

Central ray – 5° -10° cranial angulation

Cassette orientation -  portrait  or depend on patient

Protection – gonads shielding is advisable

Position of patient – the patient supine or seated on the table with leg straight and cassette placed under knee

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SKYLINE (AXIAL PATELLA) KNEE

Skyline(axial patella)  – This position done to visualize Fractures, dislocations of the knee

Collimation- to include mediiam side, lateral side and anterior skin edge and fibula head. Collimation needs to be as tight as possible as the primary beam is directed towards the patient’s body.

Centering point – apex of patella

FFD- 100cm  

Central ray – angled so that is is perpendicular to the patella femoral joint space

Cassette orientation - landscape or depend on patient

Protection – gonads shielding is advisable

Position of patient – the patient seated on the table with knee flexed 45°  and patient to hold the cassette perpendicular to table resting on the anterior aspect of the femur