Radiocapitellar line

Last revised by Dr Henry Knipe on 28 Jan 2022

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.

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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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  • Figure 1: normal on lateral view
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  • Figure 2: normal on frontal view
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