Fig. (3) Bland-Altman plots demonstrating the agreement between the radiographic (RAD) and smart tool (IJH) methods of leg length measurement. With all eligible patients included, 96% (24/25) of measurements fell within the statistical limit for strong agreement and 84% (21/25) fell within the limits of clinical relevance (A). Excluding those patients from the surgeons’ training period, 100% (13/13) of patients fell within both the statistical and clinically relevant limits (B). Dotted line: upper and lower statistical limits; dashed line: upper and lower clinical limit; solid line: mean leg length discrepancy difference.