Apophysis of the proximal 5th metatarsal

The apophysis of the proximal 5th metatarsal lies laterally and is oriented longitudinally parallel to the shaft.

Apophysis of the fifth metatarsal base appears on plain radiographs at age 12 for boys and 10 for girls. Fusion of the apophysis to the metatarsal base usually occurs within the following 2–4 years 3,4.

Differential diagnosis

It should not be confused with an os peroneum or an avulsion fracture. An avulsion fracture at this location is typically extra-articular and oriented transversally as compared to the longitudinal orientation of unfused apophysis.

Related pathology

Lower limb anatomy
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Article Information

rID: 7649
Section: Anatomy
Tag: refs
Synonyms or Alternate Spellings:

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Cases and Figures

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    Apophysis of fift...
    Figure 1: apophysis of 5th metatarsal
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    Case 1: 5th MT apophysis
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    fracture vs apoph...
    Case 2: with avulsion fracture
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    Case 3: with avulsion fracture
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    Case 4
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