Diagnosis

Mallet Fracture with Subluxation

Mallet finger injuries range from pure tendon rupture to tendon rupture with a fracture of the base of the distal phalanx. A type A mallet finger is a tendon rupture (Fig. 38—3), a type B is a chip fracture, a type C is an avulsion fracture without displacement, a type D is an avulsion fracture with displacement of the fragment (Fig. 38—4), and a type E has displacement of the avulsion fracture with subluxation of the distal phalanx. Type E fractures often require operative intervention. Forceful hyperflexion usually results in pure tendon ruptures or tendon ruptures with a small bone fracture.

In fractures involving articular surfaces, accurate anatomic reduction by surgery is usually required. For mallet fractures, satisfactory finger function may be regained despite mild arthrosis.

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