Distal ulnar neck fractures are commonly accompanied by distal radial fractures. 1) The incidence of isolated distal ulnar fractures is lower than that of distal radial fractures, and the optimal treatment remains controversial. Once the fixation of a distal radial fracture is done and the distal ulna is reduced, fixation of the distal ulnar fracture itself could be unnecessary, but if displacement remains, functional problems in the distal radioulnar joint can occur. 2,3) Thus, surgical fixation is necessary if displacement or instability remains. Plate osteosynthesis and pinning are widely used for distal ulnar fractures. 4) The same techniques are often performed to treat ulnar fractures combined with radial fractures. To reduce the operation time, we devised a intramedullary fixation technique using a headless compression screw, which is a simple and minimally invasive technique that requires a small skin incision.