Treatment options of mallet finger deformity include closed reduction with splinting and numerous techniques for open reduction is controversial. Techniques for open reduction of mallet finger deformities have involved fragment fixation with figure of eight fixation, tension band wire fixation and Kirschner wire fixation. All of these methods have certain disadvantages; wire rupture, pressure necrosis of pulp and incomplete reduction. Between 1999 and 2001, 13 digits with mallet finger deformities were treated by open reduction and internal fixation with Mitek mini anchor. Indication for open reduction included fail to reduce to a congruent articular arc without subluxation when splinting in extension, dorsal fragments involving more than one third of the articular surface, and volar subluxation of the digital phalanx. In our opinion, fixation of the fragment with Mitek mini anchor is a simple procedure and the stability provided by this method is reliable. And by using this meterial, a complete reduction of the intra-articular fracture and appropriate tendon fixation, and satisfactory function were achieved.