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A multicenter comparative study of two classification systems for radial polydactyly.

Robert R Dijkman1, Christianne A van Nieuwenhoven, Ruud W Selles

  • 1Rotterdam, The Netherlands; and Hamburg, Germany From the Departments of Plastic and Reconstructive Surgery and Hand Surgery and Rehabilitation Medicine and Physical Therapy, Erasmus MC, University Medical Center; and the Department of Hand Surgery, Catholic Children's Hospital Wilhelmstift.

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The Rotterdam classification is recommended for radial polydactyly due to its broader applicability compared to the Wassel system. Both classifications showed similar reliability, though specific types and aberrant components require clearer definitions.

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Area of Science:

  • Orthopedics
  • Hand Surgery
  • Congenital Anomalies

Background:

  • Radial polydactyly is a common congenital hand anomaly.
  • Existing classification systems, such as Wassel and Rotterdam, aim to categorize its variations.
  • Accurate classification is crucial for treatment planning and prognosis.

Purpose of the Study:

  • To compare the type occurrence and reliability of the Wassel and Rotterdam classifications for radial polydactyly.
  • To evaluate the applicability of both systems in a large patient cohort.
  • To assess the intraobserver and interobserver reliability of each classification.

Main Methods:

  • A large population of radial polydactyly patients from two European clinics were classified using both Wassel and Rotterdam systems.
  • Incidences of different types were compared to a systematic literature review.
  • Intraobserver and interobserver reliability were assessed using kappa statistics in a test-retest design with seven observers.

Main Results:

  • The Rotterdam classification could classify all 520 cases, while 40% were unclassifiable by the Wassel system.
  • Intraobserver and interobserver reliability were comparable between systems (Wassel: κ=0.87/0.65; Rotterdam: κ=0.83/0.70).
  • Types II and IV, and aberrant components (deviation, hypoplasia) showed lower reliability in both systems.

Conclusions:

  • The Rotterdam classification offers broader classification possibilities with comparable reliability to the Wassel classification.
  • Despite its complexity and the need for clearer definitions of aberrant components, the Rotterdam classification is recommended.
  • Further refinement of aberrant component definitions in the Rotterdam system could enhance its clinical relevance.