Distal phalanx: Base, dislocation

 Mechanism of the injury

The majority 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.

 Recognizing subluxation

Diagnosis is based on

  1. the history of the trauma and mechanism of the injury
  2. clinical examination
  3. the x-rays

AP and lateral x-rays are necessary for diagnosis. Be careful to avoid superimposition of other fingers.

In the lateral view, the middle and distal phalanges should be collinear. Any axial malalignment is a clear indication of subluxation.

Appendix

Shortcuts

Contact | Disclaimer | AO Foundation

v1.0 2008-11-08