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Conceptual illustration of the sensitivity of joint space volume definitions between the three original methods. A 2.5° rotation of the phalange (dotted lines) on joint space definition and border length has little effect on square edges (inset 1), while on rounded edges (inset 2) it has a large effect on CLG/SFR methods. SFR, University of California San Francisco; CLG, University of Calgary; LYN, University of Lyon.
