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HO was visualized by X-ray radiographs and the degree of HO was classified to 4 groups: 0 as no signs of HO, 1 as lightly mineralized HO, 2 as heavily mineralized but restricted to one area of the lower limb or 3 as extensive HO throughout the lower leg muscles. An example of a right leg in each category is shown. Top, native films. Bottom, inverted color pallete with Photoshop.
