Should full-length standing anteroposterior radiographs replace the scanogram for measurement of limb length discrepancy?

Abstract

The orthoroentgenogram, commonly known as the 'scanogram', continues to be the most widely used imaging technique for measuring limb length discrepancy (LLD). This study reviews other methods of measuring LLD including full-length standing anteroposterior radiographs, computed tomography/digital localization image, and microdose digital scanography. We present seven cases that demonstrate the pitfalls of scanograms as compared with full-length standing anteroposterior radiographs. Illustrative cases provide the rationale for the clinician managing LLD on a regular basis to utilize full-length standing anteroposterior radiographs as the instrument that will provide the most clinically relevant information.