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Radial beak

The radial beak, also known as an epiphyseal spur, is a benign anatomical osseous variation of the distal radius.

Radiographic appearance

The radial beak manifest as a bony protrusion at the lateral aspect of the distal radius along the line of the fused/closing growth plate 1. It is typically pointing proximally.


As a normal, albeit rare anatomical variation it can be mistaken for a distal radius fracture. 

Anatomy: Upper limb

Anatomy: Upper limb

Article information

rID: 73084
Section: Anatomy
Synonyms or Alternate Spellings:

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Cases and figures

  • Case 1: normal radial beak
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  • Case 2: radial beak and trans-scaphoid perilunate fracture dislocation
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  • Case 3: Radial beak
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