Knee (oblique view)

The Knee oblique view is an additional projection requested to examine the knee joint in greater detail, often in the absence of a CT scanner. The view is comprised of both an internal and external oblique.

  • patient is supine on the table with the knee and ankle joint in contact with the table
  • leg is extended
  • knee is rotated internally or externally 45 degrees depending on the projection 
  • anteroposterior projection
  • centring point
    • centre of the knee 1.5 cm distal to the apex of the patella
  • collimation
    • superior to include the distal femur
    • inferior to include the proximal tibia/fibula
    • lateral to include the skin margin 
    • medial to include medial skin margin
  • orientation  
    • portrait
  • detector size
    • 24 cm x 30 cm
  • exposure
    • 60-70 kVp
    • 7-10 mAs
  • SID
    • 100 cm
  • grid
    • no
  • internal rotation
    • lateral condyles of both the tibia and femur are well displayed 
    • the fibula head should be free from almost all superimposition
  • external rotation 
    • medial condyles of both the tibia and femur are well displayed 
    • the fibula head will be superimposed by the tibia 

Not often performed, this view is valuable in the absence of CT. It is worth explaining to the patient that rotation occurs at the hip and not the knee, to ease anxiety.

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Article information

rID: 58724
Section: Radiography
Tag: cases
Synonyms or Alternate Spellings:

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