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(a, b) The ulnar was gradual lengthened using a circular external frame, show a significant shorter bone healing index in this study, 3.8 cm were gained and the HI for this 10-year-old boy is 40.7 days/cm. (c) Radiograph of the forearm 14 months after external fixator removed, good relationship between the forearm bones and good remodelling of regenerate bone. HI = healing index
