Use of skeletal and soft tissue imaging to guide the surgical repair of misclassified Wassel type VI thumb duplication with convergent deformity.

Surgical treatment of Wassel type Ⅵ radial polydactyly with convergent deformity is technically challenging. We found that 17 of our cases exhibited cartilaginous connections between the bases of the radial and ulnar thumb's metacarpals. To better assess the anatomic features and guide surgical design, we used X-ray and MRI imaging to characterize the adduction of the ulnar metacarpal, radial subluxation of the metacarpophalangeal joint, narrowness of the first web, and thenar muscle distribution.

Measurement and observation of the first web space based on morphology and clinical applications.

Purpose: To describe and evaluate the anatomical skin shape of the first web space in cadavers and to guide flap design for this area.

Methods: Twelve cadavers (24 hands on both sides) were selected. Marker points were chosen based on the characteristics of the first web for morphological measurement and observation.