Nine patients with osteogenesis imperfecta tarda and stapedial fixation (12 ears) are presented. Surgical findings as well as the immediate and long-term results of stapedectomy are described and compared with the results of previous authors. We found firmly fixed footplates in all 12 ears. Only 2 ears had thick and soft footplates. In 10 ears the stapes crura were abnormally slender and brittle, but only 1 had fractured. In 4 ears a troublesome bleeding tendency occurred during the operation. Both the immediate and the long-term hearing results were in general satisfactory.