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We applied SGD unilateral multifunctional exteal fixators(designed by Prof. Yu Zhongjia and produced by Shanghai Surgical Instruments Factory) to treat open, closed and ununited fractures of tibia and fibula caused by trauma in our hospital from Jan. 1994 to Dec. 1998. 3 months to one year after operation, the fractures were united and the satisfying results were obtained. Our reports were as follows.