Type Level of duplication I Distal phalanx II Interphalangeal joint III Proximal phalanx IV Metacarpophalangeal joint V Metacarpal VI Carpometacarpal joint VII Triphalangia
Wassel classification
Herbert classification
Frykman classification
Sanders classification
Schenck classification
Gartland classification
Seinsheimer classification
Nissen-Lie classification