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Identification of the femoral tunnel. Line 1, posterior border of the cortex of the femur; line 2, superior border of the notch, perpendicular to line 1; line 3, superior border of the femoral condyle, parallel to line 2; T, center of the femoral tunnel. The Schöttle point (A) is centered 1.3 mm anterior to line 1 and midway between lines 2 and 3.
