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1Principles

These digital hyperextension injuries are commonly caused by sporting accidents ...

Mechanism of the injury

These digital hyperextension injuries are commonly caused by sporting accidents.
Typically, hyperextension of the proximal interphalangeal (PIP) joint causes an avulsion fracture of the volar plate.
Often, in addition to hyperextension, there is axial load on the middle phalanx, causing compression forces across the PIP joint and leading to an additional impaction fracture.

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