To analyze children with displaced supracondylar fractures of the humerus that were treated by immediate closed reduction and then maintained by lateral percutaneous K-wire fixation.

70 cases of supracondylar fractures of the humerus(5 type I, 19 type II, 46 type III) were treated, 14 fractures(5 type I, 7 type II, 2 type III) with cast, 49 fractures(12 type II, 37 type III) with lateral percutaneous pinning, 7 fractures(7 type III) with open reduction and internal fixation. The K-wire were removed after averaging 6.2 weeks of operation in out patient clinic. The follow-up period ranged from 6 months to 28 months, averaging 13 months.

By Flynn's functional and cosmetic criteria, 47 fractures(95.9%) among 49 fractures, treated with immediate closed reduction and lateral percutaneous pinning, resulted in satisfactory criteria. Only one fracture was reoperated due to reduction loss.

Immediate closed reduction and lateral percutaneous K-wire fixation appears to be safe and reliable option for the treatment of supracondylar fractures of the humerus in children.