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1Principles

Discontinuities of the extensor insertion are often referred to as “mallet injury” or “baseball finger”.

Diagnosis

Discontinuities of the extensor insertion are often referred to as “mallet injury” or “baseball finger”. They can be purely tendinous, or bony avulsion fractures.
Diagnosis is based on

  1. The clinical history of the trauma
  2. Deformity, pain and swelling located in the dorsal aspect of the DIP joint
  3. Inability actively and fully to extend the DIP joint
  4. X-rays

 

AP and true lateral x-rays of the DIP joint are necessary for the diagnosis of fracture avulsions.
Low-energy radiographs, as used to visualize soft tissues, can be useful in identifying small flakes of bone.