Results in Retrospective Cases

The angle quantification was also applied to 23 retrospective cases and compared with the conventional measurement technique. In these cases a CT scan as well as conventional radiographic imaging was available. The necessary 3D structures were reconstructed using the CT scans. Angular measurements on both femora were performed using the conventional and 3D methods. The comparison of the two methods showed a notable discrepancy between them. The mean difference ( + one standard deviation) between the X-ray and the 3D technique was 6.5° + 5.2°(n = 46) for shaft-neck angle, 10.3° + 13.0°(n = 45) for shaft-physis angle, — 15, 6° + 13,1°(n = 45) for neck torsion, and 2.4° +21.0° (n = 44) for physeal torsion. The comparison of the physeal torsion angles obtained with the X-ray and 3D methods is presented in Chart 1.

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