Abstract
Surgical Treatment of The Bony Mallet Deformity with Augmented Extension Block Technique: Clinical Outcomes of a New Modification

Introduction: Mallet finger deformity is a common pathology and the ‘Extension Block Technique’, is one of the most popular surgical techniques for the treatment of this condition. However, several complications may occur with this method such as fixation failure, compression failure of the dorsal part and loss of reduction. In the current study, it is aimed to report the result of our modification which is augmented extension block technique.
Materials & Method: The medical records of patients, who were operated with the diagnosis of bony mallet finger between 2015 and 2021, were evaluated retrospectively. Demographic data, mechanism of trauma, duration of operation, time from injury to surgery, follow-up period, implant removal time, and postoperative complications were collected from hospital records. Patients aged between 18 - 65 years who had been operated with augmented extension block technique with a minimum follow-up period of 6 months were included in the study. A total of 10 patients who met these criteria constituted the study group. Radiological evaluation of the cases was performed with anteroposterior and lateral radiographs. Range of motion and presence of pain were questioned and these data were evaluated according to Crawford criteria.
Results: The mean age of the all patients was 40.2 ± 10.9 (range, 24-56) years. The mean follow-up period was 39.6 ± 26.7 (range, 13-76) months. Complete union was achieved in all patients on the final follow-up radiographs. According to Crawford evaluation criteria, the results were ‘excellent’ in six of the patients and ‘good’ in four of them. There were no patients with loss of flexion however, 5° extension loss was observed in four of the subjects.
Discussion: This study demonstrates that the augmented extension block technique is a suitable option for the surgical treatment of bony mallet cases with lower complication rate and successful functional results. This modification can be considered as an alternative option for traditional extension block technique which avoids some related complications as postoperative reduction loss, rotational instability and extension loss.

Keywords: Mallet finger, Bony mallet, Extension Block

Key words: Bony mallet; Dorsal pinning; Extension Block; Mallet finger