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Modified Wassel-Flatt Type III Radial Polydactyly: Subtypes and Their Outcomes
Jae Kwang Kim1, Jun O Yoon1, Young Ho Shin1
1Department of Orthopedic Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea.
The Journal of Hand Surgery
|July 8, 2022
Summary
Surgical outcomes for modified type III radial polydactyly were evaluated. Preserving the proximal phalanx and reconstructing the collateral ligament in parallel-type cases yielded superior results compared to other subtypes.
Area of Science:
- Hand surgery
- Congenital hand differences
- Orthopedic surgery
Background:
- Modified Wassel-Flatt type III radial polydactyly presents a complex surgical challenge.
- Subdivision of this condition is crucial for tailoring effective treatment strategies.
Purpose of the Study:
- To subdivide modified type III radial polydactyly.
- To evaluate surgical procedures and outcomes based on these subtypes.
Main Methods:
- 32 thumbs with modified Wassel-Flatt type III radial polydactyly were classified into parallel, divergent, and convergent types.
- Parallel type cases were further divided into A (distal phalanx removal, ligament reconstruction) and B (excision at bifurcation).
- Outcomes were assessed using Japanese Society for Surgery of the Hand scores and joint angulation at a mean 38-month follow-up.
Main Results:
- 14 cases were parallel type, 14 divergent, and 4 convergent.
- Parallel type A demonstrated significantly better interphalangeal (IP) and metacarpophalangeal (MCP) joint angulation and functional scores than parallel type B.
- Parallel type A also showed superior functional scores compared to divergent and convergent types.
Conclusions:
- Reconstruction of the radial collateral ligament with proximal phalanx preservation in parallel type cases offers better outcomes than simple excision.
- This specific surgical approach for parallel type modified radial polydactyly leads to improved clinical results.
