Arch Hand Microsurg 2018; 23(4): 248-253  
Anatomical Direct Reduction of Bony Mallet Finger Using Modified-Intrafocal Pinning Technique
Sang-Woo Kang, Ji-Kang Park, Ho-Seung Jung, Jung-Kwon Cha, Kook-Jong Kim
Department of Orthopaedic Surgery, Chungbuk National University Hospital, Cheongju, Korea
Correspondence to: Ji-Kang Park
Department of Orthopaedic Surgery, Chungbuk National University Hospital, 776 1Sunhawn-ro, Seowon-gu, Cheongju 28644, Korea
TEL: +82-43-269-6077, FAX: +82-43-274-8719, E-mail:
Received: October 4, 2018; Revised: October 25, 2018; Accepted: October 26, 2018; Published online: December 1, 2018.
© Korean Society for Surgery of the Hand, Korean Society for Microsurgery, and Korean Society for Surgery of the Peripheral Nerve. All rights reserved.

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Purpose: The purpose of this study was to evaluate the clinical results of anatomic reduction of bony mallet finger using modified-intrafocal pinning technique.
Methods: From March 2014 to October 2017, 18 patients with bony mallet finger were treated with modified-intrafocal pinning technique. Kirschner-wire was used to directly reduction the bony fragment, and extension block pinning and distal interphalangeal joint fixation were additionally performed to minimize the loss of reduction. Postoperative pain, range of motion, and radiological evaluation were performed. Duration of bone healing, functional recovery and complication rate were evaluated and Crawford’s criteria was used to determine functional outcome after surgery.
Results: Bone union was achieved in all cases after a postoperative mean of 6 weeks (5-7 weeks). An average of 2.8° (0°-10°) extension loss occurred in all patients. All patients showed satisfactory joint congruency and reformation of the joint surface, the mean flexion angle of the distal interphalangeal joint at the final follow-up was 72.2° (70°-75°). According to Crawford’s classification, 12 patients (66.7%) were excellent and 6 patients (33.3%) were good.
Conclusion: Modified-intrafocal pinning technique is a method of obtaining anatomical bone healing by directly reduction and fixation of the bony fragment. Combined with other conventional percutaneous pinning procedures, it is expected that good results can be obtained if applied to appropriate indications.
Keywords: Bony mallet finger, Direct reduction, Anatomical reduction

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