Patella - PA

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Radiographic Positioning

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Name of projection Patella - PA
Area Covered Knee joint , patella
Pathology shown Patella fractures, dislocation, subluxation
Radiographic Anatomy Knee Radiographic Anatomy
IR Size & Orientation 18 x 24cm
Film / Screen Combination Detail
(CR and DR if available)
Bucky / Grid No
Filter No
Exposure 60 kVp
8 mAs
FFD / SID 100cm
Central Ray CR directed to mid-patella area
Perpendicular to IR
Collimation Four sides of collimation to include the area of patella
Side to side to the skin lines
Upper margin to include patella, lower margin to include knee joint
Markers Distal and Lateral
Marker orientation PA
Shielding Gonadal (check your department's policy guidelines)
Respiration Not applicable
  • Patient prone on the X-ray table with legs extended
  • Cushion for head
  • Place support under ankle and leg
  • Align and centre long axis of leg and knee to middle of IR
  • True PA: align interepicondylar line parrallel to plane of IR (usually about 5° internal rotaton is needed)
  • CR perpendicular to IR
  • CR directed to mid-patella area

Area Covered
Special Notes