The Coughlin classification is the most widely used to type bunionettes. It relies on simple angle measurements on weight-bearing foot radiographs taken in the dorsoplantar projection 1,2. In 2013 DiDomenico et al added type IV 2.
Classification
- type I: enlarged lateral surface of the head of the 5th metatarsal
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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
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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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