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Dysuria is a rare, but nevertheless severe postoperative complication associated with single-session bilateral triple pelvic osteotomy. Two cases are described in which contrast radiography of the lower urinary tract was used to diagnose urethral compression due to pelvic canal narrowing. Relief of the pressure on the urethra was achieved with an external fixation device, which distracted the acetabular fragments of the pelvis. In both cases the dysuria was resolved. The significance of this complication and its possible causes, especially regarding surgical technique, are discussed.