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Agreement between repeat measurements by the same observer for the narrowest (A) medial JSW and (B) lateral JSW of the ankle, using the method of Bland and Altman [2], is shown. Each graph illustrates the limits of agreement. The solid lines delineate the mean differences, and the dotted lines represent the mean difference ± 1.96 SD. The mean ± SD differences between the repeated measurements were +0.029 ± 0.069 mm for the medial JSW and −0.033 ± 0.159 mm for the lateral JSW.
