Presentation
Motor vehicle accident. Gross deformity of the 3rd finger upon physical examination.
Patient Data
Dislocation of the proximal interphalangeal joint (PIPJ) of the 3rd finger. The dislocation can be classified as a type II dorsal dislocation (bayonet).
No fractures are seen.
Adequate reduction of the PIPJ.
No fractures are seen.
Case Discussion
Dorsal proximal interphalangeal joint dislocations are usually the result of a hyperextension mechanism.
Plain radiographs are often sufficient to diagnose a PIPJ dislocation. Still, it is important to study the digit with proper frontal and lateral radiographs. Hand radiographs alone may miss more subtle fractures and/or dislocations of a digit, such as a volar plate avulsion fracture, which was not present in this case.
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