You are here

Polydactyly 755.0

Polydactyly xray


Polydactyly ICD-9

  • 755.0 polydactyly
  • 755.00 polydactyly; unspecified
  • 755.01 polydactyly; of fingers
  • 755.02 polydactyly' of toes

Polydactyly Etiology / Epidemiology / Natural History

  • Prexial polydactyly = thumb polydactyly
    • Males > females
    • Causcasion > African American
    • Sporadic
  • Postaxial polydactyly = duplication of the ulnar most digit
    -Autosomal dominant inheritance
    -Blacks > whites
    -Generally isolated condition in blacks, associated with other organ system dysfunction in whites.

Polydactyly Anatomy

Polydactyly Clinical Evaluation

  • Exam demonstrates obvious extra digits

Polydactyly Xray / Diagnositc Tests

  • Xray of involved area to evaluate bony involvement

Polydactyly Classification / Treatment

  • Wassel Classification (Wassel HD, CORR 1969;64:175).
  • Wassel Type I: bifid distal phalanx
  • Wassel Type II: duplicated distal phalanx
  • Wassel Type III: bifid proximal phalanx
  • Wassel Type IV: duplicated proximal phalanx
  • Wassel Type V: bifid metacarpal
  • Wassel Type VI: duplicated metacarpal
  • Wassel Type VII: thumb polydactyle with associated triphangeal thumb
  • Treatment: ablation of the radial thumb with radial collateral ligament reconstruction and advancement of the thenar insertions to the retained ulnar thumb. +/- corrective osteotomies as indicated.
  • Postaxial
    -Type A(fully developed): ecsion with collateral ligament and hypothenar muscle reconstruction.
    -Type B (rudim entary and pedunculated): consider suture ligation in newborn nursery

Polydactyly Associated Injuries / Differential Diagnosis

  • Associated congenital anomalies are rare

Polydactyly Complications

  • Late deformity

Polydactyly Follow-up Care

Polydactyly Review References

  • Kasser JR. The foot. In: Morrissy RT, Weinstein SL, eds. Lovell and Winter's Pediatric Orthopaedics. 6th ed. Philadelphia, PA: Lippincott Williams & Wilkins; 2006:1257-1328.
  • Phelps DA, Grogan DP. Polydactyly of the foot. J Pediatr Orthop. 1985 Jul-Aug;5(4):446-51.
  • °


The information on this website is intended for orthopaedic surgeons.  It is not intended for the general public. The information on this website may not be complete or accurate.  The eORIF website is not an authoritative reference for orthopaedic surgery or medicine and does not represent the "standard of care".  While the information on this site is about health care issues and sports medicine, it is not medical advice. People seeking specific medical advice or assistance should contact a board certified physician.  See Site Terms / Full Disclaimer