Doyle developed a classification for the mallet finger, which is a flexion deformity of the distal phalanx.
Mechanism: loss of continuity of the conjoined lateral bands at the distal interphalangeal joint (DIP)
Injury
Type
loss of tendon continuity associated with blunt or closed trauma, with or without a small avulsion fracture
I
loss of tendon continuity associated with a laceration at or proximal to the DIP joint
II
loss of tendon continuity associated with a deep abrasion with loss of skin, subcutaneous tissue and tendon tissue
III
fracture across the epiphyseal plate in a child
IVA
hyperflexion with fracture involving 20-50% of articular surface
IVB
hyperextension with fracture with fracture of articular surface (usually > 50%) with subluxation of the distal phalanx
IVC
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Specialty: Surgery, orthopedic, Emergency Medicine, Critical Care, Surgery, general
