Matej Kastelec, Pavel Dráč
Dislocation of the distal interphalangeal (DIP) joint of a finger is classified by the AO/OTA as 70E3.2–5, where 2–5 indicates which finger is involved.
Most of these uncommon injuries are caused by a longitudinal blow to the tip of the finger.
Typically, hyperextension of the finger causes dorsal or, rarely, palmar dislocation.
In both cases, disruptions of the collateral ligaments and the volar plate will be present.
In palmar dislocations, there will be an additional terminal extensor tendon disinsertion.
AP and lateral view x-rays should be sufficient to identify any dislocation.