Triplication of the thumb

Area of Science:

• Congenital anomalies
• Hand surgery
• Pediatric orthopedics

Background:

• Thumb duplication is a common congenital hand anomaly.
• Existing classifications, like the Wassel classification, categorize thumb duplication based on the level of duplication.
• Complex or rare presentations may not fit established categories.

Purpose of the Study:

• To present a unique case of thumb triplication.
• To discuss the anatomical features of the triplicated thumbs.
• To highlight the limitations of current classification systems for rare anomalies.

Main Methods:

• Clinical presentation of a pediatric patient with thumb triplication.
• Detailed anatomical description of the triplicated thumbs, including neurovascular and tendinous structures.
• Radiographic analysis to assess skeletal structure (phalanges, metacarpals).

Main Results:

• The child presented with complete triplication of the thumb.
• Each thumb possessed developed neurovascular bundles and tendons.
• All three thumbs were triphalangeal, with shared metacarpal and proximal phalanges.
• The anomaly did not conform to the Wassel classification.

Conclusions:

• Thumb triplication represents a rare and complex congenital anomaly.
• The presented case underscores the need for expanded classification systems for congenital hand differences.
• Further research and case reporting are essential for refining our understanding and management of such anomalies.