Radiocapitellar line

The radiocapitellar line is one of the key lines used to assess alignment on the elbow radiograph. It is particularly useful in the pediatric setting.

A line drawn down the neck of the radius should intersect the capitellum. It is important to ensure that you draw the line down the radial neck and not along the shaft because of the slight angulation at the neck of the radius.

If the line does not intersect the capitellum, there is radial head dislocation. This usually occurs in pediatric patients as a result of trauma and the dislocation is usually anterior. If the radial head is rounded, consider congenital radial head dislocation.

Article information

rID: 22508
Section: Signs, Anatomy
Synonyms or Alternate Spellings:
  • Radio-capitellar line

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Cases and figures

  • Figure 1: abnormal radiocapitellar line
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  • Figure 2: normal radiocapitellar line
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  • Case 1: Radiocapitellar line on a normal elbow - Lateral view.
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