Bilateral graphs compare two different variables together in a x-y chart, with each variable on a different line of the graph. The x-axis is a horizontal line which intersects with the vertical line, or y-axis, at a zero point. In being bilateral, there are two different plots that are used to compare next to one another. This produces a comparison of two different cases while still representing those cases graphically along the x and y axises. This particular graph compares age groups (in ranges of years) to a number of patients who had either undergone bilateral total hip arthroplasty (colored in red) or bilateral total knee arthroplasty (colored in blue).
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