Humerus (AP view)

Dr Aditya Shetty et al.

AP view of the humerus is part of the humerus series and is usually taken in standing position. However, it can also be obtained in a supine position.

The projection demonstrates the humerus in its natural anatomical position allowing for adequate radiographic examination of the entire humerus and its respected articulations. 

  • patient is preferably erect
  • midcoronal plane of the patient is parallel to the image receptor, in other words, the patient's back is against the image receptor
  • the affected arm is abducted and centred to the upright detector, if possible the arm is slight externally rotated to mimic the true anatomical position
  • anteroposterior projection
  • centring point
    • mid humerus shaft
  • collimation
    • superior to the skin margins above the glenohumeral joint
    • inferior to include the distal humerus including the elbow joint
    • lateral to include the skin margin 
    • medial to include medial skin margin 
  • orientation  
    • portrait
  • detector size
    • 35 cm x 43 cm
  • exposure
    • 60-70 kVp
    • 7-15 mAs
  • SID
    • 100 cm
  • grid
    • yes (this can vary departmentally)

The humerus is positioned AP, evidenced by medial and lateral epicondyles seen in profile, greater tuberosity is seen on the lateral aspect of the humerus.The shaft is projected away from the patient's body, minimising superimposition

It's best to show the patient how you want their arm to rest for the projection. Often you will have to tilt the LBD to be aligned with the long axis of the humerus. 
Humerus views are often done to exclude large mid-shaft humeral fractures or suspected symptomatic metastatic lesions 2, if an occult fracture is suspected at either the proximal or distal end, it's best to do a separate elbow or shoulder series. 

Radiographic views
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Article information

rID: 35282
Section: Radiography
Synonyms or Alternate Spellings:
  • Humerus antero-posterior view

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Cases and figures

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    AP Humerus Patien...
    Figure 1: AP humerus positioning
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    AP Humerus (Left)
    Figure 2: AP humerus radiograph
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    AP Proximal Humer...
    Figure 3: AP proximal humerus positioning (left)
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  • Drag
    AP Proximal Humer...
    Figure 4: AP proximal humerus radiograph
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