PURPOSE: To evaluate the clinical validity of the percutaneous K-wire fixation in applying to unstable extraarticular fracture of distal radius of patients who are older than 50 years. MATERIAL AND METHODS: The validity of K-wire fixation was examined, using subjective study of Cole and Oblelz and objective study of Scheck, on the 20 cases of unstable extraarticular fracture of distal radius of patients older than 50 years, who were treated with percutaneous K-wire fixation and followed up more than 1 year, out of 160 patients with distal radius fracture, treated in the department of orthopedic surgery of our hospital from January 1994 to August 1998. RESULTS: The result was examined with subjective study of Cole and Oblelz and objective study of Scheck. Combined judgement was made by adding up the scores of both objective and subjective study. 5 excellent cases and 12 good cases were brought forth by subjective study. Objective study achieved the result of average 18 degree of radial angle, 9.8mm of radial length and 3.6 degree of volar angle. Combined judgement achieved a good result of 3 excellent cases, 14 good cases and 3 fair cases. CONCLUSION: Percutaneous K-wire fixation is expected to be a simple, less invasive, more effective and valuable operation method in the treatment of extraarticular fracture of distal radius with severe comminution