Authors of section

Authors

Fiesky Nuñez, Renato Fricker, Matej Kastelec, Terry Axelrod

Executive Editor

Chris Colton

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Proximal, multifragmentary

Classification of avulsion fractures of the volar plate

Avulsion fractures of the volar plate are very common injuries. The Eaton classification is useful and practical, as follows:

Eaton type I (hyperextension)
These are hyperextension injuries, with a simple avulsion of the volar plate and a longitudinal split in the collateral ligaments.

Eaton type II (dorsal dislocation)
Complete dorsal dislocation of the PIP joint and avulsion of the volar plate.

Eaton type III (fracture dislocation)
A fracture dislocation with an avulsion fracture

Often, in addition to hyperextension, axial pressure applied to the fingertip, causes longitudinal compression forces on the middle phalanx towards the proximal phalanx; this can lead to an additional impaction fracture.

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