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Articular surface involvement (%) is calculated by dividing the fragment size (A) by the total articular surface (A + B). Fragment displacement (%) is calculated by dividing the fragment displacement (C) by the total articular surface (A + B).
Note. In this example, A is 1.56 mm, B is 6.79 mm, and C is 2.29 mm. This results in an articular surface involvement of 19% and fragment displacement of 27%.
