Apophysis of the proximal 5th metatarsal

Last revised by Bahman Rasuli on 29 Dec 2022

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

Apophysis of the fifth metatarsal base appears on plain radiographs at age 12 years for boys and 10 years 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 an unfused apophysis.

Related pathology

ADVERTISEMENT: Supporters see fewer/no ads

Cases and figures

  • Figure 1: apophysis of 5th metatarsal
    Drag here to reorder.
  • Case 1: 5th MT apophysis
    Drag here to reorder.
  • Case 2: with avulsion fracture
    Drag here to reorder.
  • Case 3: with avulsion fracture
    Drag here to reorder.
  • Case 4
    Drag here to reorder.
  • Case 5
    Drag here to reorder.
  • Case 6
    Drag here to reorder.
  • Case 7
    Drag here to reorder.
  • Case 8
    Drag here to reorder.
  • Case 9
    Drag here to reorder.
  • Case 10
    Drag here to reorder.
  • Case 11
    Drag here to reorder.
  • Case 12
    Drag here to reorder.
  • Case 13
    Drag here to reorder.
  • Case 14
    Drag here to reorder.
  • Case 15
    Drag here to reorder.