Foot, Preaxial Polydactyly of

Definition:

Objective: Duplication of all or part of the first ray

Comments:

There is a wide spectrum of this malformation. The mild end of the spectrum is a bifid (not cleft) nail or a distal phalanx of the hallux with a central lacuna or bifid tip. Broadened halluces without a recognizable anterior/posterior cleft should be coded as Broad hallux. Note that toe number may be affected by the finding of preaxial polydactyly. See the introductory comments for guidance on digit numbering. It is optional to modify the term by adding partial to a duplicated hallux that involves less than the entire ray (metatarsal and both phalanges) and complete for a digit that has complete duplication of all three bones.

Synonyms:

• Anterior Polydactyly

Replaces:

• Anterior Duplication of the Limb
• Tibial Polydactyly

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