Figure 3From: Reproducibility of goniometric measurement of the knee in the in-hospital phase following total knee arthroplastyDifferences between observers, plotted against the mean values of both observers for each patient for passive extension. The figure shows the mean difference between observers (solid line at centre) and the limits of agreement (dashed outer lines corresponding to ±1.96 SD of the mean difference between the first and second observers).Back to article page