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14th Triennial Congress of the International Federation of Societies for Surgery of the Hand (IFSSH), 11th Triennial Congress of the International Federation of Societies for Hand Therapy (IFSHT)

17.06. - 21.06.2019, Berlin

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Thumb Duplication Classifications – Still Need Improvement?

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  • presenting/speaker Ayse Sencan - Health Sciences University M.S. Baltalimani Bone Diseases, Teaching and Research Hospital, Hand Surgery Clinic, Istanbul, Turkey
  • Mehmet Baydar - Health Sciences University Adana City Hospital, Department of Orthopedics and Traumatology, Division of Hand Surgery, Adana, Turkey
  • Kahraman Ozturk - Health Sciences University M.S. Baltalimani Bone Diseases, Teaching and Research Hospital, Hand Surgery Clinic, Istanbul, Turkey
  • Ethem Ayhan Unkar - Health Sciences University M.S. Baltalimani Bone Diseases, Teaching and Research Hospital, Hand Surgery Clinic, Istanbul, Turkey
  • Ersin Demirkaynak - Health Sciences University M.S. Baltalimani Bone Diseases, Teaching and Research Hospital, Department of Orthopaedics and Traumatology, Istanbul, Turkey

International Federation of Societies for Surgery of the Hand. International Federation of Societies for Hand Therapy. 14th Triennial Congress of the International Federation of Societies for Surgery of the Hand (IFSSH), 11th Triennial Congress of the International Federation of Societies for Hand Therapy (IFSHT), 11th Triennial Congress of the International Federation of Societies for Hand Therapy (IFSHT). Berlin, 17.-21.06.2019. Düsseldorf: German Medical Science GMS Publishing House; 2020. DocIFSSH19-1456

doi: 10.3205/19ifssh0055, urn:nbn:de:0183-19ifssh00559

Published: February 6, 2020

© 2020 Sencan et al.
This is an Open Access article distributed under the terms of the Creative Commons Attribution 4.0 License. See license information at http://creativecommons.org/licenses/by/4.0/.

Outline

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Objectives/Interrogation: Thumb duplication is seen 0.8-1.4 per 1000 live births in Caucasians and Asian countries. Wassel system is the most frequently used for the classification of the deformity. Wassel type IV is most frequently seen followed by type II and type VII, respectively. However, some modifications have been made additionally because of Wassel classification system is insufficient in anatomically complex cases. Rotterdam classification system combining Wassel system and Buck-Gramcko and Behren's intercarpal modification is proposed to indicate different complex deformities such as triphalangism and triplication. We aimed to compare these two classification systems in our thumb duplication cases.

Methods: Fifty patients with thumb duplications who were admitted to our hospital were evaluated with posteroanterior and lateral x-rays according to Wassel and Rotterdam classification systems. 29 patients were male, duplication was present in right hand in 28, in left hand in 21, and in both hands in a patient.

Results and Conclusions: According to Wassel classification system, type IV, type VI, type VII, type V, type III, and type II duplication was found in 27, three, five, two, four, and five patients respectively. Five patients could not be classified. 13 patients were type IVD, 11 patients were type IV H, three patients were type II, three patients were type III, two patients were type VI, seven patients had triphalangism, and three patients could not be classified.