Abstract : A Supracondylar fracture of humerus is a common paediatric fracture accounting for 50% to 70% of all elbow fractures. The present study is to compare the functional outcome of lateral based configuration versus criss cross pattern of pinning. Prospective study design were constructed with 45 children with Gartland type III supracondylar fractures of humerus, at the Department of Orthopaedics, Meenakshi medical college and research institute, kanchipuram, During the period August 2017 to August 2020.Inclusion criteria were in type III supracondylar fractures of humerus, in age group of 2-12 years, Type I and Type II supracondylar fractures and those treated by open reduction were excluded from study. The children were treated on an emergency basis with closed reduction and percutaneous pinning, under the guidance of C-arm image intensifier. Follow – up was done regularly at 6 weeks, 3 months, 6 months and then once in 6 months. In our series, a total of 45 cases were treated; 28 patients (62%) underwent crossed pinning with medial and lateral pins and 17 patients (38%) underwent lateral pinning. The choice of method of pin fixation was made according to operating surgeon’s personal preference. Pin tract infection with pin loosening occurred in 3 patients in our series (6.6%). The follow-up period for cases ranged from 5 months to 36 months with an average follow-up duration of 19.53 months. In 5 month of follow-up our series was adequate enough to assess fracture union, malalignment, range of motion and recovery from nerve injuries. In our series, the functional outcome following criss cross pinning was excellent in 82% and good in 18% of cases. And cases treated with lateral pinning showed 71% excellent and 29% good results with no poor results. In our study there is no significant difference between the stability provided by criss cross pin fixation and two lateral pin fixation method. But the criss cross pin fixation group show two (7%) cases of iatrogenic ulnar nerve injuries. In the present study we conclude that the lateral pin fixation method for the treatment of Type III supracondylar fracture is safe and reliable.