This paper suggests the use of distraction dynamic external fixators (DDEF) for the treatment of proximal middle phalanx fractures.

Seven patients, who were diagnosed with comminuted intra-articular fractures at the base of the middle phalanx from February 2014 to November 2016, were enrolled in this study (volar aspect 6 cases, dorsal aspect 1 case). They underwent a closed reduction under a C-arm image intensifier, and DDEF was applied with general anesthesia. Range of motion (ROM) exercise was encouraged after 3 to 5 days postoperatively, and DDEF was removed after 5 weeks. Subluxation, angulation and displacement were evaluated 6 weeks postoperatively.

The patients who were treated with DDEF showed a normal proximal interphalangeal joint ROM (100°), and there was no subluxation or displacement on the X-ray film 6 weeks postoperatively. In addition, there were no signs of infection, such as local heat, redness, and pus-like discharge.

DDEF helps maintain the reduction and reducing forces through the ligamentotaxis. The joint stiffness is reduced, which it makes early return to daily life easier.