Sato K, Mimata Y, Takahashi G, et al. - As both the anterior border of the capitellum and the undeveloped ossific nucleus are clearly recognisable on lateral radiographs, researchers examined the distance between the anterior humeral line (AHL) and capitellum (AC distance). This study was sought to assume that the AC distance would provide a highly reproducible and useful index of correction losses in supracondylar humeral fractures. This study included a total of 42 patients (mean age: 6.5 years) who had suffered supracondylar humeral fractures. Inter-observer and intra-observer variability were evaluated in all three radiological parameters and also compared these parameters between children who had undergone lateral pin fixation and those who underwent crossed pin fixation. They distinguished AC distance as the most reliable method for measuring radiographs compared with the Baumann angle and tilting angle. Furthermore, they found smaller correction losses with cross pinning than with lateral pinning. Thus, when analysing supracondylar fractures in children, the AC distance was found to be effective and accurate quantitative parameter applying sagittal plane images.