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Caliblator curved RF device. (A) Measuring deep to shallow. (B) Measuring shallow articular cartilage to center of femoral footprint, which lies halfway between deep and shallow articular cartilage. (C) Measuring from low articular cartilage along line of bifurcate ridge. The height of the center of the femoral tunnel is 2 mm plus the radius of the femoral tunnel above the low articular cartilage.
