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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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Subtypes of Radial Polydactyly bifercating at the Metacarpophalangeal Joint Level

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  • presenting/speaker Wenyao Zhong - Dept. of Hand Surgery, Beijing Jishuitan Hospital, Beijing, China
  • Wen Tian - Dept. of Hand Surgery, Beijing Jishuitan Hospital, Beijing, China
  • Junhui Zhao - Dept. of Hand Surgery, Beijing Jishuitan Hospital, Beijing, China

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. DocIFSSH19-1354

doi: 10.3205/19ifssh0040, urn:nbn:de:0183-19ifssh00409

Published: February 6, 2020

© 2020 Zhong 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: Among different types of radial polydactyly, cases bifercating at the metacarpophalangeal (MP) joint level is the most common,and it can be subdivided into 11 subtypes according to X-rays of the thumb.

Methods: From Jan 2015 to Dec 2017, 256 cases of radial polydactyly bifercating at the MP Joint Level were reviewed. For the radial and ulnar thumb in one case, the relative degree of development, the deviation from the main axis and the angulation of the interphalangeal(IP) joint were analysed in the x-rays.

Results and Conclusions: The radial thumb developed approximately equally to the ulnar one in 170 cases. 84 cases had the obvious hypoplastic radial one and 24 of them did not articulate with the metacarpal. Only 2 cases had the hypoplastic ulnar thumb. For the deviation, both thumbs were divergent in 175 cases, and 1 case showed radial deviation for both. 80 cases had the obvious deflective radial one but the ulnar thumb seemed in line with the main axis. Angled IP joints were presented in both radial and ulnar thumbs in 61 cases, and 69 cases did not have angled IP joints. 114 cases only showed angulation in the radial one, while 12 cases in the ulnar thumb. In conclusion of all the X-rays, we found 11 subtypes.

11 subtypes of radial polydactyly bifercating at the MP Joint level were found in the x-ray and different surgical strategies were indicated.