Olecranon foramen

An olecranon foramen, also known as septal aperture or supratrochlear foramen, is a common normal anatomical variant of the distal humerus


There is a wide variation of incidence, occurring between 5% to 50% of the population depending on ethnicity, being more common in individuals of African descent than Caucasians, and is most often bilateral 1,2.  

Gross anatomy

The olecranon foramen is an aperture formed by the failure of ossification of the septum that separates the coronoid and olecranon fossae.

Related pathology

  • presence may put patients at increased risk of distal humerus fractures 3
Anatomy: Upper limb

Anatomy: Upper limb

Article information

rID: 28610
Section: Anatomy
Synonyms or Alternate Spellings:
  • Septal aperture
  • Supratrochlear foramen

ADVERTISEMENT: Supporters see fewers/no ads

Cases and figures

  • Case 1
    Drag here to reorder.
  • Case 2
    Drag here to reorder.
  • Case 3
    Drag here to reorder.
  • Updating… Please wait.

     Unable to process the form. Check for errors and try again.

     Thank you for updating your details.