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Case Reports in Orthopedics
Volume 2016, Article ID 8086594, 3 pages
Case Report

Two Extension Block Kirschner Wires’ Technique for Bony Mallet Thumb

Department of Orthopaedic Surgery, Kobe University Graduate School of Medicine, Kobe 650-0017, Japan

Received 2 April 2016; Accepted 10 August 2016

Academic Editor: Georg Singer

Copyright © 2016 Yutaka Mifune et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Mallet fingers with an avulsion fracture of the distal phalanx or rupture of the terminal tendon of the extensor mechanism is known as a common injury, while mallet thumb is very rare. In this paper, the case of a 19-year-old woman with a sprained left thumb sustained while playing basketball is presented. Plain radiographs and computed tomography revealed an avulsion fracture involving more than half of the articular surface at the base of the distal phalanx. Closed reduction and percutaneous fixation were performed using the two extension block Kirschner wires’ technique under digital block anesthesia. At 4 months postoperatively, the patient had achieved excellent results according to Crawford’s evaluation criteria and had no difficulties in working or playing basketball. Various conservative and operative treatment strategies have been reported for management of mallet thumb. We chose the two extension block Kirschner wires’ technique to minimize invasion of the extensor mechanism and nail bed and to stabilize the large fracture fragment.