Sternoclavicular joint (anterior oblique views)

The anterior oblique projections of the sternoclavicular joints are complimentary to the front on PA view in the sternoclavicular joint series. The oblique positioning manoeuvres the join of interest away from central structures to produce a clearer view of articulation.

The side of obliquity pertains to the joint of interest i.e. RAO to assess the right sternoclavicular joint. However, this projection is often performed bilaterally, subsequently, this article will describe the projection as a bilateral examination.  

  • the patient is preferably laid prone with a 10 to 15-degree anterior oblique rotation this is normally achieved with a wedge sponge helping the patient maintain position.
  • a bilateral examination will require the patient to lay RAO and LAO for separate projections 
  • this examination can be performed erect if the patient is stable
  • posteroanterior anterior oblique projection
  • centring point
    • centred at the level of the second to third thoracic vertebra at the midline
    • 2-5 cm lateral from the midline toward the raised side (relative to detector i.e. LAO would favour centring laterally towards the right)
  • collimation
    • laterally to include the medical third of both clavicles 
    • inferior to include the sternoclavicular joints and part of the manubrium 
    • superior to include the entirety of the sternoclavicular joint
  • orientation  
    • landscape
  • detector size
    • 24 cm x 18 cm
  • exposure
    • 60-70 kVp
    • 10-30 mAs
  • SID
    • 100 cm
  • breathing
    • suspended expiration
  • grid
    • yes (this can vary departmentally)
  • the sternoclavicular joint of interest will be central to the image without foreshortening 
  • the opposite join will appear foreshortened and obscured by the bony thorax 
  • the most challenging aspect when performing this projection is collimation; collimation must be tight to avoid scatter thus decreasing the image quality. Time should be taken to ensure the image is collimated appropriately.
  • this projection is often performed bilaterally for comparison, it's important to remember that the side of interest will be the obliquity of the oblique
    • RAO evaluates the right sternoclavicular joint
    • LAO evaluates the left sternoclavicular joint
  • the projection can be performed erect, be wary of the patient's movement
Radiographic views
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Article information

rID: 54318
Section: Radiography
Synonyms or Alternate Spellings:

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Cases and figures

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    Figure 1: LAO
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    Figure 2: RAO
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