Supracondylar spur

A supracondylar spursupracondylar process, supratrochlear spur, or avian spur of the distal anteromedial humeral cortex is an anatomical variant present in ~1% 1-2 of the population. 

The supracondylar spur is typically located on the anteromedial humeral cortex, 5 cm proximal to and pointing towards the medial epicondyle of the humerus 3

This structure is often considered a vestigial structure, as a supracondylar canal (or foramen), can be found as a normal structure in many more primitive mammals, such as in felines 1.

The ligament of Struthers may be present and join the tip of this process with the medial epicondyle 1, forming a supracondylar canal through which the median nerve and brachial artery pass 2. This ligament is thought to represent the vestigial third head of coracobrachialis. The two main heads surround the musculocutaneous nerve and then fuse in human fetuses, which explains why the nerve passes through the muscle 4.

Most patients are asymptomatic although it should be considered if patients present with symptoms of median nerve compression and there is no pathology on imaging of the carpal tunnel.

This can also result in compression of the brachial artery

Plain radiograph

Typically, it is seen as a small bony spur projecting anteromedially from the humeral metadiaphysis towards the elbow joint.

Complications

Upper limb anatomy
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Article Information

rID: 9956
Section: Anatomy
Synonyms or Alternate Spellings:
  • Supracondylar process
  • Avian spur
  • Epicondylar process
  • Supratrochlear spur

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