Chromium and Nickel Concentrations in Subjects with a Stainless Steel Metal-on-Metal Cervical Disc Arthroplasty: Results from a Prospective Longitudinal Study with 7 Years Follow-Up

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Figure 1
Cr serum metal concentrations. Solid line dividing the interquartile box represents the median and (•) represents the mean. Extended whiskers from each side of the box represent lowest and highest observations. Extreme cases (*) are defined as values more than 3 interquartile ranges from the upper or lower edge of the interquartile box, while outliers (°) are defined as cases with values between 1.5 and 3 interquartile ranges from the upper or lower edge of the box.
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Figure 2
Ni serum metal concentrations. Solid line dividing the interquartile box represents the median and (•) represents the mean. Extended whiskers from each side of the box represent lowest and highest observations. Extreme cases (*) are defined as values more than 3 interquartile ranges from the upper or lower edge of the interquartile box, while outliers (°) are defined as cases with values between 1.5 and 3 interquartile ranges from the upper or lower edge of the box.