Coughlin classification

Dr Daniel J Bell et al.

The Coughlin classification is the most widely used to type bunionettes. It relies on simple angle measurements on weightbearing foot radiographs taken in the dorsoplantar projection 1,2. In 2013 DiDomenico et al added type IV 2.

Type I
  • enlarged lateral surface of the head of the 5th metatarsal
Type II
  • irregular lateral bowing of the distal 5th metatarsal
  • 4th to 5th intermetatarsal angle (4-5 IMA) is normal
  • lateral deviation angle is abnormal
Type III
  • 4th to 5th intermetatarsal angle (4-5 IMA) is abnormal
  • lateral deviation angle is normal
Type IV
  • any combination of types I-III


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Article information

rID: 66214
Tag: cases
Synonyms or Alternate Spellings:
  • Coughlin's classification of bunionettes

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