Patella - Lateral

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Radiographic Positioning

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Name of projection Patella - Lateral (mediolateral)
Area Covered Patella, patellofemoral joint and tibiofemoral joints
Pathology shown Patella fractures, dislocation, abnormalities of patellofemoral and tibiofemoral joints
Radiographic Anatomy Knee Radiographic Anatomy
IR Size & Orientation 18 x 24cm
Film / Screen Combination Detail
(CR and DR as recommended by manufacturer)
Bucky / Grid No
Filter No
Exposure 60 kVp
8 mAs
FFD / SID 100cm
Central Ray CR directed to the midpatellofemoral joint
Perpendicular to IR
Collimation Four sides of collimation
Closely collimate to the area of patella and knee joint
Markers Distal and Lateral
Marker orientation AP
Shielding Gonadal (check your department's policy guidelines)
Respiration Not applicable
  • Patient in lateral recumbent position on the X-ray table with affected side down
  • Cushion for head
  • Provide support for opposite knee
  • Adjust rotation of body and leg until knee is in a true lateral position
  • Flex knee 5° to 10° (additional flexion may separate fracture fragment)
  • Align and centre long axis of patella to centre line of IR
  • CR directed to the midpatellofemoral joint, perpendicular to IR

Area Covered
Special Notes