Thumb, Absent

Definition:

Objective: The absence of both phalanges of a thumb and the associated soft tissues

Comments:

This descriptor does not require absence of the metacarpal. This definition excludes Partial absence of the thumb. Oligodactyly and hypodactyly have been replaced with more specific terms to allow the distinction of loss of a thumb from loss of F2-5. The term oligodactyly is replaced because oligodactyly refers to the digits that remain, and so oligodactyly of the thumb or oligodactyly F1 is nonsensical.

Replaces:

• Hypodactyly
• Oligodactyly

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