Zigzag Deformity

• Ignoring a zigzag deformity can lead to additional complications.

• Recurrence of the deformity can be seen in reconstructions done prior to 18 months of age.

• Incomplete correction and instability at the reconstructed metacarpophalangeal joint

Wassel Classification Thumb

Figure 82—3. Distal phalanx with artwork showing the technique for a Bilhaut-Cloquet.

Differential Diagnosis

Duplicated thumb (classification system Table 82—1)

Diagnosis

Bifid Proximal Phalanx of the Thumb

Polydactyly is defined as duplication of a finger or part of it. It occurs as an isolated malformation, in association with other malformations of the hands and/or feet, or as a part of a syndrome. It is one of the most frequent congenital anomalies and is seen frequently in the hands. The prevalence of polydactyly with or without an associated malformation varies between 5 and 17 per 10,000 live births. The bifid thumb represents a complete or partial duplication of the thumb. It occurs in 1 per 3000 births.

Table 82—1 Wassel Classification Based on the Complete or Incomplete Duplication of Each Phalanx: Preaxial Polydactyly Thumb Classification

Type

Description

Frequency

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